Security+ 3.0 Threats and Vulnerabilities (20%)

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QUESTION NO: 460 A network analyst received a number of reports that impersonation was taking place on the network. Session tokens were deployed to mitigate this issue and defend against which of the following attacks? A. Replay B. DDoS C. Smurf D. Ping of Death

Answer: A Explanation: A replay attack (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by IP packet substitution (such as stream cipher attack). For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (posing as Alice) connects to Bob; when asked for a proof of identity, Eve sends Alice's password (or hash) read from the last session, which Bob accepts thus granting access to Eve. Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a onetime token to Alice, which Alice uses to transform the password and send the result to Bob (e.g. computing a hash function of the session token appended to the password). On his side Bob performs the same computation; if and only if both values match, the login is successful. Now suppose Eve has captured this value and tries to use it on another session; Bob sends a different session token, and when Eve replies with the captured value it will be different from Bob's computation. Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as Bob, presenting some predicted future token, and convince Alice to use that token in her transformation. Eve can then replay her reply at a later time (when the previously predicted token is actually presented by Bob), and Bob will accept the authentication. One-time passwords are similar to session tokens in that the password expires after it has been used or after a very short amount of time. They can be used to authenticate individual transactions in addition to sessions. The technique has been widely implemented in personal online banking systems. Bob can also send nonces but should then include a message authentication code (MAC), which Alice should check. Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a secure protocol. For example Bob periodically broadcasts the time on his clock together with a MAC. When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her message, which is also authenticated. Bob only accepts messages for which the timestamp is within a reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-) random numbers, with the trade-off being that replay attacks, if they are performed quickly enough i.e. within that 'reasonable' limit, could succeed.

QUESTION NO: 494 Users are encouraged to click on a link in an email to obtain exclusive access to the newest version of a popular Smartphone. This is an example of. A. Scarcity B. Familiarity C. Intimidation D. Trust

Answer: A Explanation: Scarcity, in the area of social psychology, works much like scarcity in the area of economics. Simply put, humans place a higher value on an object that is scarce, and a lower value on those that are abundant. The thought that we, as humans, want something we cannot have drives us to desire the object even more. This idea is deeply embedded in the intensely popular, "Black Friday" shopping extravaganza that U.S. consumers participate in every year on the day after Thanksgiving. More than getting a bargain on a hot gift idea, shoppers thrive on the competition itself, in obtaining the scarce product. In this question, people want the brand new latest version of a smartphone. The temptation of being one of the first to get the new phone will tempt people into clicking the link in the email.

QUESTION NO: 492 Which of the following is characterized by an attacker attempting to map out an organization's staff hierarchy in order to send targeted emails? A. Whaling B. Impersonation C. Privilege escalation D. Spear phishing

Answer: A Explanation: A whaling attack is targeted at company executives. Mapping out an organization's staff hierarchy to determine who the people at the top are is also part of a whaling attack. Whaling is a specific kind of malicious hacking within the more general category of phishing, which involves hunting for data that can be used by the hacker. In general, phishing efforts are focused on collecting personal data about users. In whaling, the targets are high-ranking bankers, executives or others in powerful positions or job titles. Hackers who engage in whaling often describe these efforts as "reeling in a big fish," applying a familiar metaphor to the process of scouring technologies for loopholes and opportunities for data theft. Those who are engaged in whaling may, for example, hack into specific networks where these powerful individuals work or store sensitive data. They may also set up keylogging or other malware on a work station associated with one of these executives. There are many ways that hackers can pursue whaling, leading C-level or top-level executives in business and government to stay vigilant about the possibility of cyber threats.

QUESTION NO: 451 Which of the following describes a type of malware which is difficult to reverse engineer in a virtual lab? A. Armored virus B. Polymorphic malware C. Logic bomb D. Rootkit

Answer: A Explanation: An armored virus is a type of virus that has been designed to thwart attempts by analysts from examining its code by using various methods to make tracing, disassembling and reverse engineering more difficult. An Armored Virus may also protect itself from antivirus programs, making it more difficult to trace. To do this, the Armored Virus attempts to trick the antivirus program into believing its location is somewhere other than where it really is on the system.

QUESTION NO: 489 A database administrator receives a call on an outside telephone line from a person who states that they work for a well-known database vendor. The caller states there have been problems applying the newly released vulnerability patch for their database system, and asks what version is being used so that they can assist. Which of the following is the BEST action for the administrator to take? A. Thank the caller, report the contact to the manager, and contact the vendor support line to verify any reported patch issues. B. Obtain the vendor's email and phone number and call them back after identifying the number of systems affected by the patch. C. Give the caller the database version and patch level so that they can receive help applying the patch. D. Call the police to report the contact about the database systems, and then check system logs for attack attempts.

Answer: A Explanation: Impersonation is where a person, computer, software application or service pretends to be someone or something it's not. Impersonation is commonly non-maliciously used in client/server applications. However, it can also be used as a security threat. In this question, the person making the call may be impersonating someone who works for a wellknown database vendor. The actions described in this answer would mitigate the risk. By not divulging information about your database system and contacting the vendor directly, you can be sure that you are talking to the right people.

QUESTION NO: 474 Which of the following is described as an attack against an application using a malicious file? A. Client side attack B. Spam C. Impersonation attack D. Phishing attack

Answer: A Explanation: In this question, a malicious file is used to attack an application. If the application is running on a client computer, this would be a client side attack. Attacking a service or application on a server would be a server side attack. Client-side attacks target vulnerabilities in client applications interacting with a malicious data. The difference is the client is the one initiating the bad connection. Client-side attacks are becoming more popular. This is because server side attacks are not as easy as they once were according to apache.org. Attackers are finding success going after weaknesses in desktop applications such as browsers, media players, common office applications and e-mail clients. To defend against client-side attacks keep-up the most current application patch levels, keep antivirus software updated and keep authorized software to a minimum.

QUESTION NO: 515 Sara, a security administrator, is noticing a slow down in the wireless network response. Sara launches a wireless sniffer and sees a large number of ARP packets being sent to the AP. Which of the following type of attacks is underway? A. IV attack B. Interference C. Blue jacking D. Packet sniffing

Answer: A Explanation: In this question, it's likely that someone it trying to crack the wireless network security. An initialization vector is a random number used in combination with a secret key as a means to encrypt data. This number is sometimes referred to as a nonce, or "number occurring once," as an encryption program uses it only once per session. An initialization vector is used to avoid repetition during the data encryption process, making it impossible for hackers who use dictionary attack to decrypt the exchanged encrypted message by discovering a pattern. This is known as an IV attack. A particular binary sequence may be repeated more than once in a message, and the more it appears, the more the encryption method is discoverable. For example if a one-letter word exists in a message, it may be either "a" or "I" but it can't be "e" because the word "e" is non-sensical in English, while "a" has a meaning and "I" has a meaning. Repeating the words and letters makes it possible for software to apply a dictionary and discover the binary sequence corresponding to each letter. Using an initialization vector changes the binary sequence corresponding to each letter, enabling the letter "a" to be represented by a particular sequence in the first instance, and then represented by a completely different binary sequence in the second instance. WEP (Wireless Equivalent Privacy) is vulnerable to an IV attack. Because RC4 is a stream cipher, the same traffic key must never be used twice. The purpose of an IV, which is transmitted as plain text, is to prevent any repetition, but a 24-bit IV is not long enough to ensure this on a busy network. The way the IV was used also opened WEP to a related key attack. For a 24-bit IV, there is a 50% probability the same IV will repeat after 5000 packets.

QUESTION NO: 532 Which of the following BEST describes a SQL Injection attack? A. The attacker attempts to have the receiving server pass information to a back-end database from which it can compromise the stored information. B. The attacker attempts to have the receiving server run a payload using programming commonly found on web servers. C. The attacker overwhelms a system or application, causing it to crash and bring the server down to cause an outage. D. The attacker overwhelms a system or application, causing it to crash, and then redirects the memory address to read from a location holding the payload.

Answer: A Explanation: SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

QUESTION NO: 457 A security technician at a small business is worried about the Layer 2 switches in the network suffering from a DoS style attack caused by staff incorrectly cabling network connections between switches. Which of the following will BEST mitigate the risk if implemented on the switches? A. Spanning tree B. Flood guards C. Access control lists D. Syn flood

Answer: A Explanation: Spanning Tree is designed to eliminate network 'loops' from incorrect cabling between switches. Imagine two switches named switch 1 and switch 2 with two network cables connecting the switches. This would cause a network loop. A network loop between two switches can cause a 'broadcast storm' where a broadcast packet is sent out of all ports on switch 1 which includes two links to switch 2. The broadcast packet is then sent out of all ports on switch 2 which includes links back to switch 1. The broadcast packet will be sent out of all ports on switch 1 again which includes two links to switch 2 and so on thus flooding the network with broadcast traffic. The Spanning-Tree Protocol (STP) was created to overcome the problems of transparent bridging in redundant networks. The purpose of STP is to avoid and eliminate loops in the network by negotiating a loop-free path through a root bridge. This is done by determining where there are loops in the network and blocking links that are redundant. Spanning-Tree Protocol executes an algorithm called the Spanning-Tree Algorithm (STA). In order to find redundant links, STA will choose a reference point called a Root Bridge, and then determines all the available paths to that reference point. If it finds a redundant path, it chooses for the best path to forward and for all other redundant paths to block. This effectively severs the redundant links within the network. All switches participating in STP gather information on other switches in the network through an exchange of data messages. These messages are referred to as Bridge Protocol Data Units (BPDUs). The exchange of BPDUs in a switched environment will result in the election of a root switch for the stable spanning-tree network topology, election of designated switch for every switched segment, and the removal of loops in the switched network by placing redundant switch ports in a backup state.

QUESTION NO: 525 Pete, the security administrator, has been notified by the IDS that the company website is under attack. Analysis of the web logs show the following string, indicating a user is trying to post a comment on the public bulletin board. INSERT INTO message `<script>source=http://evilsite</script> This is an example of which of the following? A. XSS attack B. XML injection attack C. Buffer overflow attack D. SQL injection attack

Answer: A Explanation: The <script> </script> tags indicate that script is being inserted. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users. Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.

QUESTION NO: 481 An investigator recently discovered that an attacker placed a remotely accessible CCTV camera in a public area overlooking several Automatic Teller Machines (ATMs). It is also believed that user accounts belonging to ATM operators may have been compromised. Which of the following attacks has MOST likely taken place? A. Shoulder surfing B. Dumpster diving C. Whaling attack D. Vishing attack

Answer: A Explanation: The CCTV camera has recorded people entering their PINs in the ATMs. This is known as shoulder surfing. Shoulder surfing is using direct observation techniques, such as looking over someone's shoulder, to get information. Shoulder surfing is an effective way to get information in crowded places because it's relatively easy to stand next to someone and watch as they fill out a form, enter a PIN number at an ATM machine, or use a calling card at a public pay phone. Shoulder surfing can also be done long distance with the aid of binoculars or other vision-enhancing devices. To prevent shoulder surfing, experts recommend that you shield paperwork or your keypad from view by using your body or cupping your hand.

QUESTION NO: 484 Several bins are located throughout a building for secure disposal of sensitive information. Which of the following does this prevent? A. Dumpster diving B. War driving C. Tailgating D. War chalking

Answer: A Explanation: The bins in this question will be secure bins designed to prevent someone accessing the 'rubbish' to learn sensitive information. Dumpster diving is looking for treasure in someone else's trash. (A dumpster is a large trash container.) In the world of information technology, dumpster diving is a technique used to retrieve information that could be used to carry out an attack on a computer network. Dumpster diving isn't limited to searching through the trash for obvious treasures like access codes or passwords written down on sticky notes. Seemingly innocent information like a phone list, calendar, or organizational chart can be used to assist an attacker using social engineering techniques to gain access to the network. To prevent dumpster divers from learning anything valuable from your trash, experts recommend that your company establish a disposal policy where all paper, including print-outs, is shredded in a cross-cut shredder before being recycled, all storage media is erased, and all staff is educated about the danger of untracked trash.

QUESTION NO: 527 A security administrator looking through IDS logs notices the following entry: (where [email protected] and passwd= 'or 1==1') Which of the following attacks had the administrator discovered? A. SQL injection B. XML injection C. Cross-site script D. Header manipulation

Answer: A Explanation: The code in the question is an example of a SQL Injection attack. The code '1==1' will always provide a value of true. This can be included in statement designed to return all rows in a SQL table. SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

QUESTION NO: 500 Which of the following attacks would cause all mobile devices to lose their association with corporate access points while the attack is underway? A. Wireless jamming B. Evil twin C. Rogue AP D. Packet sniffing

Answer: A Explanation: When most people think of frequency jamming, what comes to mind are radio, radar and cell phone jamming. However, any communication that uses radio frequencies can be jammed by a strong radio signal in the same frequency. In this manner, Wi-Fi may be attacked with a network jamming attack, reducing signal quality until it becomes unusable or disconnects occur. With very similar methods, a focused and aimed signal can actually break access point hardware, as with equipment destruction attacks.

QUESTION NO: 531 Highly sensitive data is stored in a database and is accessed by an application on a DMZ server. The disk drives on all servers are fully encrypted. Communication between the application server and end-users is also encrypted. Network ACLs prevent any connections to the database server except from the application server. Which of the following can still result in exposure of the sensitive data in the database server? A. SQL Injection B. Theft of the physical database server C. Cookies D. Cross-site scripting

Answer: A Explanation: The question discusses a very secure environment with disk and transport level encryption and access control lists restricting access. SQL data in a database is accessed by SQL queries from an application on the application server. The data can still be compromised by a SQL injection attack. SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

QUESTION NO: 495 A computer supply company is located in a building with three wireless networks. The system security team implemented a quarterly security scan and saw the following. SSIDStateChannelLevel Computer AreUs1connected170dbm Computer AreUs2connected580dbm Computer AreUs3connected375dbm Computer AreUs4connected695dbm Which of the following is this an example of? A. Rogue access point B. Near field communication C. Jamming D. Packet sniffing

Answer: A Explanation: The question states that the building has three wireless networks. However, the scan is showing four wireless networks with the SSIDs: Computer AreUs1 , Computer AreUs2 , Computer AreUs3 and Computer AreUs4. Therefore, one of these wireless networks probably shouldn't be there. This is an example of a rogue access point. A rogue access point is a wireless access point that has either been installed on a secure company network without explicit authorization from a local network administrator, or has been created to allow a hacker to conduct a man-in-the-middle attack. Rogue access points of the first kind can pose a security threat to large organizations with many employees, because anyone with access to the premises can install (maliciously or non-maliciously) an inexpensive wireless router that can potentially allow access to a secure network to unauthorized parties. Rogue access points of the second kind target networks that do not employ mutual authentication (client-server serverclient) and may be used in conjunction with a rogue RADIUS server, depending on security configuration of the target network. To prevent the installation of rogue access points, organizations can install wireless intrusion prevention systems to monitor the radio spectrum for unauthorized access points.

QUESTION NO: 503 After a recent breach, the security administrator performs a wireless survey of the corporate network. The security administrator notices a problem with the following output: MAC SSID ENCRYPTION POWER BEACONS 00:10:A1:36:12:CC MYCORP WPA2 CCMP 60 1202 00:10:A1:49:FC:37 MYCORP WPA2 CCMP 70 9102 FB:90:11:42:FA:99 MYCORP WPA2 CCMP 40 3031 00:10:A1:AA:BB:CC MYCORP WPA2 CCMP 55 2021 00:10:A1:FA:B1:07 MYCORP WPA2 CCMP 30 6044 Given that the corporate wireless network has been standardized, which of the following attacks is underway? A. Evil twin B. IV attack C. Rogue AP D. DDoS

Answer: A Explanation: The question states that the corporate wireless network has been standardized. By 'standardized' it means the wireless network access points are running on hardware from the same vendor. We can see this from the MAC addresses used. The first half of a MAC address is vendor specific. The second half is network adapter specific. We have four devices with MAC addresses that start with 00:10:A1. The "odd one out" is the device with a MAC address starting FB:90:11. This device is from a different vendor. The SSID of the wireless network on this access point is the same as the other legitimate access points. Therefore, the access point with a MAC address starting FB:90:11 is impersonating the corporate access points. This is known as an Evil Twin. An evil twin, in the context of network security, is a rogue or fake wireless access point (WAP) that appears as a genuine hotspot offered by a legitimate provider. In an evil twin attack, an eavesdropper or hacker fraudulently creates this rogue hotspot to collect the personal data of unsuspecting users. Sensitive data can be stolen by spying on a connection or using a phishing technique. For example, a hacker using an evil twin exploit may be positioned near an authentic Wi-Fi access point and discover the service set identifier (SSID) and frequency. The hacker may then send a radio signal using the exact same frequency and SSID. To end users, the rogue evil twin appears as their legitimate hotspot with the same name. In wireless transmissions, evil twins are not a new phenomenon. Historically, they were known as honeypots or base station clones. With the advancement of wireless technology and the use of wireless devices in public areas, it is very easy for novice users to set up evil twin exploits.

QUESTION NO: 528 Which of the following types of application attacks would be used to specifically gain unauthorized information from databases that did not have any input validation implemented? A. SQL injection B. Session hijacking and XML injection C. Cookies and attachments D. Buffer overflow and XSS

Answer: A Explanation: To access information in databases, you use SQL. To gain unauthorized information from databases, a SQL Injection attack is used. SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

QUESTION NO: 478 A recent spike in virus detections has been attributed to end-users visiting www.compnay.com. The business has an established relationship with an organization using the URL of www.company.com but not with the site that has been causing the infections. Which of the following would BEST describe this type of attack? A. Typo squatting B. Session hijacking C. Cross-site scripting D. Spear phishing

Answer: A Explanation: Typosquatting, also called URL hijacking or fake url, is a form of cybersquatting, and possibly brandjacking which relies on mistakes such as typographical errors made by Internet users when inputting a website address into a web browser. Should a user accidentally enter an incorrect website address, they may be led to any URL (including an alternative website owned by a cybersquatter). The typosquatter's URL will usually be one of four kinds, all similar to the victim site address: (In the following, the intended website is "example.com") •A common misspelling, or foreign language spelling, of the intended site: exemple.com •A misspelling based on typing errors: xample.com or examlpe.com •A differently phrased domain name: examples.com •A different top-level domain: example.org Once in the typosquatter's site, the user may also be tricked into thinking that they are in fact in the real site; through the use of copied or similar logos, website layouts or content.

QUESTION NO: 477 A security administrator must implement all requirements in the following corporate policy: Passwords shall be protected against offline password brute force attacks. Passwords shall be protected against online password brute force attacks. Which of the following technical controls must be implemented to enforce the corporate policy? (Select THREE). A. Account lockout B. Account expiration C. Screen locks D. Password complexity E. Minimum password lifetime F. Minimum password length

Answer: A,D,F Explanation: A brute force attack is a trial-and-error method used to obtain information such as a user password or personal identification number (PIN). In a brute force attack, automated software is used to generate a large number of consecutive guesses as to the value of the desired data. Brute force attacks may be used by criminals to crack encrypted data, or by security analysts to test an organization's network security. A brute force attack may also be referred to as brute force cracking. For example, a form of brute force attack known as a dictionary attack might try all the words in a dictionary. Other forms of brute force attack might try commonly-used passwords or combinations of letters and numbers. The best defense against brute force attacks strong passwords. The following password policies will ensure that users have strong (difficult to guess) passwords: F: Minimum password length. This policy specifies the minimum number of characters a password should have. For example: a minimum password length of 8 characters is regarded as good security practice. D: Password complexity determines what characters a password should include. For example, you could require a password to contain uppercase and lowercase letters and numbers. This will ensure that passwords don't consist of dictionary words which are easy to crack using brute force techniques. A: Account lockout policy: This policy ensures that a user account is locked after a number of incorrect password entries. For example, you could specify that if a wrong password is entered three times, the account will be locked for a period of time or indefinitely until the account is unlocked by an administrator.

QUESTION NO: 522 Which of the following wireless protocols could be vulnerable to a brute-force password attack? (Select TWO). A. WPA2-PSK B. WPA - EAP - TLS C. WPA2-CCMP D. WPA -CCMP E. WPA - LEAP F. WEP

Answer: A,E Explanation: A brute force attack is an attack that attempts to guess a password. WPA2-PSK and WEP both use a "Pre-Shared Key". The pre-shared key is a password and therefore is susceptible to a brute force attack.

QUESTION NO: 454 A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs: 10.10.3.16 10.10.3.23 212.178.24.26 217.24.94.83 These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring? A. XSS B. DDoS C. DoS D. Xmas

Answer: B Explanation: A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer. One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable. Such attacks usually lead to a server overload. A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems (for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time. Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.

QUESTION NO: 456 An administrator notices an unusual spike in network traffic from many sources. The administrator suspects that: A. it is being caused by the presence of a rogue access point. B. it is the beginning of a DDoS attack. C. the IDS has been compromised. D. the internal DNS tables have been poisoned.

QUESTION NO: 516 Maintenance workers find an active network switch hidden above a dropped-ceiling tile in the CEO's office with various connected cables from the office. Which of the following describes the type of attack that was occurring? A. Spear phishing B. Packet sniffing C. Impersonation D. MAC flooding

Answer: B Explanation: A Protocol Analyzer is a hardware device or more commonly a software program used to capture network data communications sent between devices on a network. Capturing packets sent from a computer system is known as packet sniffing. However, packet sniffing requires a physical connection to the network. The switch hidden in the ceiling is used to provide the physical connection to the network. Well known software protocol analyzers include Message Analyzer (formerly Network Monitor) from Microsoft and Wireshark (formerly Ethereal). A sniffer (packet sniffer) is a tool that intercepts data flowing in a network. If computers are connected to a local area network that is not filtered or switched, the traffic can be broadcast to all computers contained in the same segment. This doesn't generally occur, since computers are generally told to ignore all the comings and goings of traffic from other computers. However, in the case of a sniffer, all traffic is shared when the sniffer software commands the Network Interface Card (NIC) to stop ignoring the traffic. The NIC is put into promiscuous mode, and it reads communications between computers within a particular segment. This allows the sniffer to seize everything that is flowing in the network, which can lead to the unauthorized access of sensitive data. A packet sniffer can take the form of either a hardware or software solution. A sniffer is also known as a packet analyzer.

QUESTION NO: 449 Pete, a security analyst, has been tasked with explaining the different types of malware to his colleagues. The two malware types that the group seems to be most interested in are botnets and viruses. Which of the following explains the difference between these two types of malware? A. Viruses are a subset of botnets which are used as part of SYN attacks. B. Botnets are a subset of malware which are used as part of DDoS attacks. C. Viruses are a class of malware which create hidden openings within an OS. D. Botnets are used within DR to ensure network uptime and viruses are not.

Answer: B Explanation: A botnet is a collection of Internet-connected programs communicating with other similar programs in order to perform tasks. This can be as mundane as keeping control of an Internet Relay Chat (IRC) channel, or it could be used to send spam email or participate in distributed denial-of-service attacks. The word botnet is a combination of the words robot and network. The term is usually used with a negative or malicious connotation. Computers can be co-opted into a botnet when they execute malicious software. This can be accomplished by luring users into making a drive-by download, exploiting web browser vulnerabilities, or by tricking the user into running a Trojan horse program, which may come from an email attachment. This malware will typically install modules that allow the computer to be commanded and controlled by the botnet's operator. Many computer users are unaware that their computer is infected with bots. Depending on how it is written, a Trojan may then delete itself, or may remain present to update and maintain the modules

QUESTION NO: 471 A company's employees were victims of a spear phishing campaign impersonating the CEO. The company would now like to implement a solution to improve the overall security posture by assuring their employees that email originated from the CEO. Which of the following controls could they implement to BEST meet this goal? A. Spam filter B. Digital signatures C. Antivirus software D. Digital certificates

Answer: B Explanation: A digital signature is a mathematical technique used to validate the authenticity and integrity of a message, software, or digital document. The digital equivalent of a handwritten signature or stamped seal, but offering far more inherent security, a digital signature is intended to solve the problem of tampering and impersonation in digital communications. Digital signatures can provide the added assurances of evidence to origin, identity and status of an electronic document, transaction or message, as well as acknowledging informed consent by the signer. Digital signatures are based on public key cryptography, also known as asymmetric cryptography. Using a public key algorithm such as RSA, one can generate two keys that are mathematically linked: one private and one public. To create a digital signature, signing software (such as an email program) creates a one-way hash of the electronic data to be signed. The private key is then used to encrypt the hash. The encrypted hash -- along with other information, such as the hashing algorithm -- is the digital signature. The reason for encrypting the hash instead of the entire message or document is that a hash function can convert an arbitrary input into a fixed length value, which is usually much shorter. This saves time since hashing is much faster than signing.

QUESTION NO: 513 The practice of marking open wireless access points is called which of the following? A. War dialing B. War chalking C. War driving D. Evil twin

Answer: B Explanation: War chalking is the act of making chalk marks on outdoor surfaces (walls, sidewalks, buildings, sign posts, trees) to indicate the existence of an open wireless network connection, usually offering an Internet connection so that others can benefit from the free wireless access. The open connections typically come from the access points of wireless networks located within buildings to serve enterprises. The chalk symbols indicate the type of access point that is available at that specific spot.

QUESTION NO: 499 Which of the following is where an unauthorized device is found allowing access to a network? A. Bluesnarfing B. Rogue access point C. Honeypot D. IV attack

Answer: B Explanation: A rogue access point is a wireless access point that has either been installed on a secure company network without explicit authorization from a local network administrator, or has been created to allow a hacker to conduct a man-in-the-middle attack. Rogue access points of the first kind can pose a security threat to large organizations with many employees, because anyone with access to the premises can install (maliciously or non-maliciously) an inexpensive wireless router that can potentially allow access to a secure network to unauthorized parties. Rogue access points of the second kind target networks that do not employ mutual authentication (client-server serverclient) and may be used in conjunction with a rogue RADIUS server, depending on security configuration of the target network. To prevent the installation of rogue access points, organizations can install wireless intrusion prevention systems to monitor the radio spectrum for unauthorized access points.

QUESTION NO: 463 Which of the following will help prevent smurf attacks? A. Allowing necessary UDP packets in and out of the network B. Disabling directed broadcast on border routers C. Disabling unused services on the gateway firewall D. Flash the BIOS with the latest firmware

Answer: B Explanation: A smurf attack involves sending PING requests to a broadcast address. Therefore, we can prevent smurf attacks by blocking broadcast packets on our external routers. A smurf attack is a type of network security breach in which a network connected to the Internet is swamped with replies to ICMP echo (PING) requests. A smurf attacker sends PING requests to an Internet broadcast address. These are special addresses that broadcast all received messages to the hosts connected to the subnet. Each broadcast address can support up to 255 hosts, so a single PING request can be multiplied 255 times. The return address of the request itself is spoofed to be the address of the attacker's victim. All the hosts receiving the PING request reply to this victim's address instead of the real sender's address. A single attacker sending hundreds or thousands of these PING messages per second can fill the victim's T-1 (or even T-3) line with ping replies, bring the entire Internet service to its knees. Smurfing falls under the general category of Denial of Service attacks -- security attacks that don't try to steal information, but instead attempt to disable a computer or network.

QUESTION NO: 486 At the outside break area, an employee, Ann, asked another employee to let her into the building because her badge is missing. Which of the following does this describe? A. Shoulder surfing B. Tailgating C. Whaling D. Impersonation

Answer: B Explanation: Although Ann is an employee and therefore authorized to enter the building, she does not have her badge and therefore strictly she should not be allowed to enter the building. Just as a driver can tailgate another driver's car by following too closely, in the security sense, tailgating means to compromise physical security by following somebody through a door meant to keep out intruders. Tailgating is actually a form of social engineering, whereby someone who is not authorized to enter a particular area does so by following closely behind someone who is authorized.

QUESTION NO: 504 Which of the following types of wireless attacks would be used specifically to impersonate another WAP in order to gain unauthorized information from mobile users? A. IV attack B. Evil twin C. War driving D. Rogue access point

Answer: B Explanation: An evil twin, in the context of network security, is a rogue or fake wireless access point (WAP) that appears as a genuine hotspot offered by a legitimate provider. In an evil twin attack, an eavesdropper or hacker fraudulently creates this rogue hotspot to collect the personal data of unsuspecting users. Sensitive data can be stolen by spying on a connection or using a phishing technique. For example, a hacker using an evil twin exploit may be positioned near an authentic Wi-Fi access point and discover the service set identifier (SSID) and frequency. The hacker may then send a radio signal using the exact same frequency and SSID. To end users, the rogue evil twin appears as their legitimate hotspot with the same name. In wireless transmissions, evil twins are not a new phenomenon. Historically, they were known as honeypots or base station clones. With the advancement of wireless technology and the use of wireless devices in public areas, it is very easy for novice users to set up evil twin exploits.

QUESTION NO: 514 Which of the following types of attacks involves interception of authentication traffic in an attempt to gain unauthorized access to a wireless network? A. Near field communication B. IV attack C. Evil twin D. Replay attack

Answer: B Explanation: An initialization vector is a random number used in combination with a secret key as a means to encrypt data. This number is sometimes referred to as a nonce, or "number occurring once," as an encryption program uses it only once per session. An initialization vector is used to avoid repetition during the data encryption process, making it impossible for hackers who use dictionary attack to decrypt the exchanged encrypted message by discovering a pattern. This is known as an IV attack. A particular binary sequence may be repeated more than once in a message, and the more it appears, the more the encryption method is discoverable. For example if a one-letter word exists in a message, it may be either "a" or "I" but it can't be "e" because the word "e" is non-sensical in English, while "a" has a meaning and "I" has a meaning. Repeating the words and letters makes it possible for software to apply a dictionary and discover the binary sequence corresponding to each letter. Using an initialization vector changes the binary sequence corresponding to each letter, enabling the letter "a" to be represented by a particular sequence in the first instance, and then represented by a completely different binary sequence in the second instance. WEP (Wireless Equivalent Privacy) is vulnerable to an IV attack. Because RC4 is a stream cipher, the same traffic key must never be used twice. The purpose of an IV, which is transmitted as plain text, is to prevent any repetition, but a 24-bit IV is not long enough to ensure this on a busy network. The way the IV was used also opened WEP to a related key attack. For a 24-bit IV, there is a 50% probability the same IV will repeat after 5000 packets.

QUESTION NO: 505 Matt, an administrator, is concerned about the wireless network being discovered by war driving. Which of the following can be done to mitigate this? A. Enforce a policy for all users to authentic through a biometric device. B. Disable all SSID broadcasting. C. Ensure all access points are running the latest firmware. D. Move all access points into public access areas.

Answer: B Explanation: B: War driving is the act of using a detection tool to look for wireless networking signals. The setting making a wireless network closed (or at least hidden) is the disabling of service set identifier (SSID) broadcasting. Thus by disabling all SSID broadcasting you can mitigate the risk of war driving.

QUESTION NO: 506 Which of the following describes how Sara, an attacker, can send unwanted advertisements to a mobile device? A. Man-in-the-middle B. Bluejacking C. Bluesnarfing D. Packet sniffing

Answer: B Explanation: Bluejacking is the sending of unsolicited messages over Bluetooth to Bluetooth-enabled devices such as mobile phones, PDAs or laptop computers, sending a vCard which typically contains a message in the name field (i.e., for bluedating or bluechat) to another Bluetooth-enabled device via the OBEX protocol. Bluetooth has a very limited range, usually around 10 metres (32.8 ft) on mobile phones, but laptops can reach up to 100 metres (328 ft) with powerful (Class 1) transmitters. Bluejacking is usually harmless, but because bluejacked people generally don't know what has happened, they may think that their phone is malfunctioning. Usually, a bluejacker will only send a text message, but with modern phones it's possible to send images or sounds as well. Bluejacking has been used in guerrilla marketing campaigns to promote advergames.

QUESTION NO: 507 Joe, an employee is taking a taxi through a busy city and starts to receive unsolicited files sent to his Smartphone. Which of the following is this an example of? A. Vishing B. Bluejacking C. War Driving D. SPIM E. Bluesnarfing

QUESTION NO: 511 An administrator has advised against the use of Bluetooth phones due to bluesnarfing concerns. Which of the following is an example of this threat? A. An attacker using the phone remotely for spoofing other phone numbers B. Unauthorized intrusions into the phone to access data C. The Bluetooth enabled phone causing signal interference with the network D. An attacker using exploits that allow the phone to be disabled

Answer: B Explanation: Bluesnarfing is the theft of information from a wireless device through a Bluetooth connection. Bluetooth is a high-speed but very short-range wireless technology for exchanging data between desktop and mobile computers, personal digital assistants (PDAs), and other devices. By exploiting a vulnerability in the way Bluetooth is implemented on a mobile phone, an attacker can access information -- such as the user's calendar, contact list and e-mail and text messages -- without leaving any evidence of the attack. Other devices that use Bluetooth, such as laptop computers, may also be vulnerable, although to a lesser extent, by virtue of their more complex systems. Operating in invisible mode protects some devices, but others are vulnerable as long as Bluetooth is enabled.

QUESTION NO: 523 A victim is logged onto a popular home router forum site in order to troubleshoot some router configuration issues. The router is a fairly standard configuration and has an IP address of 192.168.1.1. The victim is logged into their router administrative interface in one tab and clicks a forum link in another tab. Due to clicking the forum link, the home router reboots. Which of the following attacks MOST likely occurred? A. Brute force password attack B. Cross-site request forgery C. Cross-site scripting D. Fuzzing

Answer: B Explanation: Cross-Site Request Forgery—also known as XSRF, session riding, and one-click attack—involves unauthorized commands coming from a trusted user to the website. This is often done without the user's knowledge, and it employs some type of social networking to pull it off. For example, assume that Evan and Spencer are chatting through Facebook. Spencer sends Evan a link to what he purports is a funny video that will crack him up. Evan clicks the link, but it actually brings up Evan's bank account information in another browser tab, takes a screenshot of it, closes the tab, and sends the information to Spencer. The reason the attack is possible is because Evan is a trusted user with his own bank. In order for it to work, Evan would need to have recently accessed that bank's website and have a cookie that had yet to expire. The best protection against crosssite scripting is to disable the running of scripts (and browser profiles).

QUESTION NO: 524 A security administrator develops a web page and limits input into the fields on the web page as well as filters special characters in output. The administrator is trying to prevent which of the following attacks? A. Spoofing B. XSS C. Fuzzing D. Pharming

Answer: B Explanation: Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users. Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user. By validating user input and preventing special characters, we can prevent the injection of clientside scripting code.

QUESTION NO: 473 Users at a company report that a popular news website keeps taking them to a web page with derogatory content. This is an example of which of the following? A. Evil twin B. DNS poisoning C. Vishing D. Session hijacking

Answer: B Explanation: DNS spoofing (or DNS cache poisoning) is a computer hacking attack, whereby data is introduced into a Domain Name System (DNS) resolver's cache, causing the name server to return an incorrect IP address, diverting traffic to the attacker's computer (or any other computer). A domain name system server translates a human-readable domain name (such as example.com) into a numerical IP address that is used to route communications between nodes. Normally if the server doesn't know a requested translation it will ask another server, and the process continues recursively. To increase performance, a server will typically remember (cache) these translations for a certain amount of time, so that, if it receives another request for the same translation, it can reply without having to ask the other server again. When a DNS server has received a false translation and caches it for performance optimization, it is considered poisoned, and it supplies the false data to clients. If a DNS server is poisoned, it may return an incorrect IP address, diverting traffic to another computer (in this case, the server hosting the web page with derogatory content).

QUESTION NO: 537 Data execution prevention is a feature in most operating systems intended to protect against which type of attack? A. Cross-site scripting B. Buffer overflow C. Header manipulation D. SQL injection

Answer: B Explanation: Data Execution Prevention (DEP) is a security feature included in modern operating systems. It marks areas of memory as either "executable" or "nonexecutable", and allows only data in an "executable" area to be run by programs, services, device drivers, etc. It is known to be available in Linux, OS X, Microsoft Windows, iOS and Android operating systems. DEP protects against some program errors, and helps prevent certain malicious exploits, especially attacks that store executable instructions in a data area via a buffer overflow. A buffer overflow occurs when a program or process tries to store more data in a buffer (temporary data storage area) than it was intended to hold. Since buffers are created to contain a finite amount of data, the extra information - which has to go somewhere - can overflow into adjacent buffers, corrupting or overwriting the valid data held in them. Although it may occur accidentally through programming error, buffer overflow is an increasingly common type of security attack on data integrity. In buffer overflow attacks, the extra data may contain codes designed to trigger specific actions, in effect sending new instructions to the attacked computer that could, for example, damage the user's files, change data, or disclose confidential information. Buffer overflow attacks are said to have arisen because the C programming language supplied the framework, and poor programming practices supplied the vulnerability.

QUESTION NO: 483 Ann, an employee, is cleaning out her desk and disposes of paperwork containing confidential customer information in a recycle bin without shredding it first. This is MOST likely to increase the risk of loss from which of the following attacks? A. Shoulder surfing B. Dumpster diving C. Tailgating D. Spoofing

Answer: B Explanation: Dumpster diving is looking for treasure in someone else's trash. (A dumpster is a large trash container.) In the world of information technology, dumpster diving is a technique used to retrieve information that could be used to carry out an attack on a computer network. Dumpster diving isn't limited to searching through the trash for obvious treasures like access codes or passwords written down on sticky notes. Seemingly innocent information like a phone list, calendar, or organizational chart can be used to assist an attacker using social engineering techniques to gain access to the network. To prevent dumpster divers from learning anything valuable from your trash, experts recommend that your company establish a disposal policy where all paper, including print-outs, is shredded in a cross-cut shredder before being recycled, all storage media is erased, and all staff is educated about the danger of untracked trash.

QUESTION NO: 487 Pete's corporation has outsourced help desk services to a large provider. Management has published a procedure that requires all users, when receiving support, to call a special number. Users then need to enter the code provided to them by the help desk technician prior to allowing the technician to work on their PC. Which of the following does this procedure prevent? A. Collusion B. Impersonation C. Pharming D. Transitive Access

Answer: B Explanation: Impersonation is where a person, computer, software application or service pretends to be someone or something it's not. Impersonation is commonly non-maliciously used in client/server applications. However, it can also be used as a security threat. The procedure the users have to go through is to ensure that the technician who will have access to the computer is a genuine technician and not someone impersonating a technician.

QUESTION NO: 488 Purchasing receives a phone call from a vendor asking for a payment over the phone. The phone number displayed on the caller ID matches the vendor's number. When the purchasing agent asks to call the vendor back, they are given a different phone number with a different area code. Which of the following attack types is this? A. Hoax B. Impersonation C. Spear phishing D. Whaling

Answer: B Explanation: In this question, the impersonator is impersonating a vendor and asking for payment. They have managed to 'spoof' their calling number so that their caller ID matches the vendor's number. Impersonation is where a person, computer, software application or service pretends to be someone or something it's not. Impersonation is commonly non-maliciously used in client/server applications. However, it can also be used as a security threat.

QUESTION NO: 485 Physical documents must be incinerated after a set retention period is reached. Which of the following attacks does this action remediate? A. Shoulder Surfing B. Dumpster Diving C. Phishing D. Impersonation

Answer: B Explanation: Incinerating documents (or shredding documents) instead of throwing them into a bin will prevent people being able to read the documents to view sensitive information. Dumpster diving is looking for treasure in someone else's trash. (A dumpster is a large trash container.) In the world of information technology, dumpster diving is a technique used to retrieve information that could be used to carry out an attack on a computer network. Dumpster diving isn't limited to searching through the trash for obvious treasures like access codes or passwords written down on sticky notes. Seemingly innocent information like a phone list, calendar, or organizational chart can be used to assist an attacker using social engineering techniques to gain access to the network. To prevent dumpster divers from learning anything valuable from your trash, experts recommend that your company establish a disposal policy where all paper, including print-outs, is shredded in a cross-cut shredder before being recycled, all storage media is erased, and all staff is educated about the danger of untracked trash.

QUESTION NO: 464 Which of the following wireless security measures can an attacker defeat by spoofing certain properties of their network interface card? A. WEP B. MAC filtering C. Disabled SSID broadcast D. TKIP

Answer: B Explanation: MAC filtering is typically used in wireless networks. In computer networking, MAC Filtering (or GUI filtering, or layer 2 address filtering) refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network. MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. While the restriction of network access through the use of lists is straightforward, an individual person is not identified by a MAC address, rather a device only, so an authorized person will need to have a whitelist entry for each device that he or she would use to access the network. While giving a wireless network some additional protection, MAC filtering can be circumvented by scanning a valid MAC (via airodumping) and then spoofing one's own MAC into a validated one.

QUESTION NO: 468 A security administrator notices large amounts of traffic within the network heading out to an external website. The website seems to be a fake bank site with a phone number that when called, asks for sensitive information. After further investigation, the security administrator notices that a fake link was sent to several users. This is an example of which of the following attacks? A. Vishing B. Phishing C. Whaling D. SPAM E. SPIM

Answer: B Explanation: Phishing is the act of sending an email to a user falsely claiming to be an established legitimate enterprise in an attempt to scam the user into surrendering private information that will be used for identity theft. Phishing email will direct the user to visit a website where they are asked to update personal information, such as a password, credit card, social security, or bank account numbers, that the legitimate organization already has. The website, however, is bogus and set up only to steal the information the user enters on the page. Phishing emails are blindly sent to thousands, if not millions of recipients. By spamming large groups of people, the "phisher" counts on the email being read by a percentage of people who actually have an account with the legitimate company being spoofed in the email and corresponding webpage. Phishing, also referred to as brand spoofing or carding, is a variation on "fishing," the idea being that bait is thrown out with the hopes that while most will ignore the bait, some will be tempted into biting.

QUESTION NO: 508 A user commuting to work via public transport received an offensive image on their smart phone from another commuter. Which of the following attacks MOST likely took place? A. War chalking B. Bluejacking C. War driving D. Bluesnarfing

Answer: B Explanation: The question states that the 'attack' took place on public transport and was received on a smartphone. Therefore, it is most likely that the image was sent using Bluetooth. Bluejacking is the sending of unsolicited messages over Bluetooth to Bluetooth-enabled devices such as mobile phones, PDAs or laptop computers, sending a vCard which typically contains a message in the name field (i.e., for bluedating or bluechat) to another Bluetooth-enabled device via the OBEX protocol. Bluetooth has a very limited range, usually around 10 metres (32.8 ft) on mobile phones, but laptops can reach up to 100 metres (328 ft) with powerful (Class 1) transmitters. Bluejacking is usually harmless, but because bluejacked people generally don't know what has happened, they may think that their phone is malfunctioning. Usually, a bluejacker will only send a text message, but with modern phones it's possible to send images or sounds as well. Bluejacking has been used in guerrilla marketing campaigns to promote advergames.

QUESTION NO: 444 A trojan was recently discovered on a server. There are now concerns that there has been a security breach that allows unauthorized people to access data. The administrator should be looking for the presence of a/an: A. Logic bomb. B. Backdoor. C. Adware application. D. Rootkit.

Answer: B Explanation: There has been a security breach on a computer system. The security administrator should now check for the existence of a backdoor. A backdoor in a computer system (or cryptosystem or algorithm) is a method of bypassing normal authentication, securing unauthorized remote access to a computer, obtaining access to plaintext, and so on, while attempting to remain undetected. The backdoor may take the form of an installed program (e.g., Back Orifice) or may subvert the system through a rootkit. A backdoor in a login system might take the form of a hard coded user and password combination which gives access to the system. Although the number of backdoors in systems using proprietary software (software whose source code is not publicly available) is not widely credited, they are nevertheless frequently exposed. Programmers have even succeeded in secretly installing large amounts of benign code as Easter eggs in programs, although such cases may involve official forbearance, if not actual permission. Many computer worms, such as Sobig and Mydoom, install a backdoor on the affected computer (generally a PC on broadband running Microsoft Windows and Microsoft Outlook). Such backdoors appear to be installed so that spammers can send junk e-mail from the infected machines. Others, such as the Sony/BMG rootkit distributed silently on millions of music CDs through late 2005, are intended as DRM measures—and, in that case, as data gathering agents, since both surreptitious programs they installed routinely contacted central servers.

QUESTION NO: 448 Which of the following malware types is MOST likely to execute its payload after Jane, an employee, has left the company? A. Rootkit B. Logic bomb C. Worm D. Botnet

Answer: B Explanation: This is an example of a logic bomb. The logic bomb is configured to 'go off' or when Jane has left the company. A logic bomb is a piece of code intentionally inserted into a software system that will set off a malicious function when specified conditions are met. For example, a programmer may hide a piece of code that starts deleting files should they ever be terminated from the company. Software that is inherently malicious, such as viruses and worms, often contain logic bombs that execute a certain payload at a pre-defined time or when some other condition is met. This technique can be used by a virus or worm to gain momentum and spread before being noticed. Some viruses attack their host systems on specific dates, such as Friday the 13th or April Fool's Day. Trojans that activate on certain dates are often called "time bombs". To be considered a logic bomb, the payload should be unwanted and unknown to the user of the software. As an example, trial programs with code that disables certain functionality after a set time are not normally regarded as logic bombs.

QUESTION NO: 521 Which of the following protocols is vulnerable to man-in-the-middle attacks by NOT using end to end TLS encryption? A. HTTPS B. WEP C. WPA D. WPA 2

Answer: B Explanation: WEP offers no end-to-end TLS encryption. The WEP process consists of a series of steps as follows: The wireless client sends an authentication request. The Access Point (AP) sends an authentication response containing clear-text (uh-oh!) challenge text. The client takes the challenge text received and encrypts it using a static WEP key. The client sends the encrypted authentication packet to the AP. The AP encrypts the challenge text using its own static WEP key and compares the result to the authentication packet sent by the client. If the results match, the AP begins the association process for the wireless client. The big issue with WEP is the fact that it is very susceptible to a Man in the Middle attack. The attacker captures the clear-text challenge and then the authentication packet reply. The attacker then reverses the RC4 encryption in order to derive the static WEP key. Yikes! As you might guess, the designers attempted to strengthen WEP using the approach of key lengths. The native Windows client supported a 104-bit key as opposed to the initial 40-bit key. The fundamental weaknesses in the WEP process still remained however.

QUESTION NO: 472 A user has unknowingly gone to a fraudulent site. The security analyst notices the following system change on the user's host: Old `hosts' file: 127.0.0.1 localhost New `hosts' file: 127.0.0.1 localhost 5.5.5.5 www.comptia.com Which of the following attacks has taken place? A. Spear phishing B. Pharming C. Phishing D. Vishing

Answer: B Explanation: We can see in this question that a fraudulent entry has been added to the user's hosts file. This will point the URL: www.comptia.com to 5.5.5.5 instead of the correct IP address. Similar in nature to e-mail phishing, pharming seeks to obtain personal or private (usually financial related) information through domain spoofing. Rather than being spammed with malicious and mischievous e-mail requests for you to visit spoof Web sites which appear legitimate, pharming 'poisons' a DNS server (or hosts file) by infusing false information into the DNS server, resulting in a user's request being redirected elsewhere. Your browser, however will show you are at the correct Web site, which makes pharming a bit more serious and more difficult to detect. Phishing attempts to scam people one at a time with an e-mail while pharming allows the scammers to target large groups of people at one time through domain spoofing.

QUESTION NO: 493 Which of the following attacks targets high level executives to gain company information? A. Phishing B. Whaling C. Vishing D. Spoofing

Answer: B Explanation: Whaling is a specific kind of malicious hacking within the more general category of phishing, which involves hunting for data that can be used by the hacker. In general, phishing efforts are focused on collecting personal data about users. In whaling, the targets are high-ranking bankers, executives or others in powerful positions or job titles. Hackers who engage in whaling often describe these efforts as "reeling in a big fish," applying a familiar metaphor to the process of scouring technologies for loopholes and opportunities for data theft. Those who are engaged in whaling may, for example, hack into specific networks where these powerful individuals work or store sensitive data. They may also set up keylogging or other malware on a work station associated with one of these executives. There are many ways that hackers can pursue whaling, leading C-level or top-level executives in business and government to stay vigilant about the possibility of cyber threats.

QUESTION NO: 535 Sara, a hacker, is completing a website form to request a free coupon. The site has a field that limits the request to 3 or fewer coupons. While submitting the form, Sara runs an application on her machine to intercept the HTTP POST command and change the field from 3 coupons to 30. Which of the following was used to perform this attack? A. SQL injection B. XML injection C. Packet sniffer D. Proxy

Answer: B Explanation: When a web user takes advantage of a weakness with SQL by entering values that they should not, it is known as a SQL injection attack. Similarly, when the user enters values that query XML (known as XPath) with values that take advantage of exploits, it is known as an XML injection attack. XPath works in a similar manner to SQL, except that it does not have the same levels of access control, and taking advantage of weaknesses within can return entire documents. The best way to prevent XML injection attacks is to filter the user's input and sanitize it to make certain that it does not cause XPath to return more data than it should.

QUESTION NO: 440 A user casually browsing the Internet is redirected to a warez site where a number of pop-ups appear. After clicking on a pop-up to complete a survey, a drive-by download occurs. Which of the following is MOST likely to be contained in the download? A. Backdoor B. Spyware C. Logic bomb D. DDoS E. Smurf

Answer: B Explanation: Explanation Spyware is software that is used to gather information about a person or organization without their knowledge and sends that information to another entity. Whenever spyware is used for malicious purposes, its presence is typically hidden from the user and can be difficult to detect. Some spyware, such as keyloggers, may be installed by the owner of a shared, corporate, or public computer intentionally in order to monitor users.

QUESTION NO: 447 Ann, a software developer, has installed some code to reactivate her account one week after her account has been disabled. Which of the following is this an example of? (Select TWO). A. Rootkit B. Logic Bomb C. Botnet D. Backdoor E. Spyware

Answer: B,D Explanation: This is an example of both a logic bomb and a backdoor. The logic bomb is configured to 'go off' or activate one week after her account has been disabled. The reactivated account will provide a backdoor into the system. A logic bomb is a piece of code intentionally inserted into a software system that will set off a malicious function when specified conditions are met. For example, a programmer may hide a piece of code that starts deleting files should they ever be terminated from the company. Software that is inherently malicious, such as viruses and worms, often contain logic bombs that execute a certain payload at a pre-defined time or when some other condition is met. This technique can be used by a virus or worm to gain momentum and spread before being noticed. Some viruses attack their host systems on specific dates, such as Friday the 13th or April Fool's Day. Trojans that activate on certain dates are often called "time bombs". To be considered a logic bomb, the payload should be unwanted and unknown to the user of the software. As an example, trial programs with code that disables certain functionality after a set time are not normally regarded as logic bombs. A backdoor in a computer system (or cryptosystem or algorithm) is a method of bypassing normal authentication, securing unauthorized remote access to a computer, obtaining access to plaintext, and so on, while attempting to remain undetected. The backdoor may take the form of an installed program (e.g., Back Orifice) or may subvert the system through a rootkit. A backdoor in a login system might take the form of a hard coded user and password combination which gives access to the system.

QUESTION NO: 455 A distributed denial of service attack can BEST be described as: A. Invalid characters being entered into a field in a database application. B. Users attempting to input random or invalid data into fields within a web browser application. C. Multiple computers attacking a single target in an organized attempt to deplete its resources. D. Multiple attackers attempting to gain elevated privileges on a target system.

Answer: C Explanation: A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer. One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable. Such attacks usually lead to a server overload. A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems (for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time. Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.

QUESTION NO: 509 Which of the following is characterized by an attack against a mobile device? A. Evil twin B. Header manipulation C. Blue jacking D. Rogue AP

Answer: C Explanation: A bluejacking attack is where unsolicited messages are sent to mobile devices using Bluetooth. Bluejacking is the sending of unsolicited messages over Bluetooth to Bluetooth-enabled devices such as mobile phones, PDAs or laptop computers, sending a vCard which typically contains a message in the name field (i.e., for bluedating or bluechat) to another Bluetooth-enabled device via the OBEX protocol. Bluetooth has a very limited range, usually around 10 metres (32.8 ft) on mobile phones, but laptops can reach up to 100 metres (328 ft) with powerful (Class 1) transmitters. Bluejacking is usually harmless, but because bluejacked people generally don't know what has happened, they may think that their phone is malfunctioning. Usually, a bluejacker will only send a text message, but with modern phones it's possible to send images or sounds as well. Bluejacking has been used in guerrilla marketing campaigns to promote advergames.

QUESTION NO: 439 A program has been discovered that infects a critical Windows system executable and stays dormant in memory. When a Windows mobile phone is connected to the host, the program infects the phone's boot loader and continues to target additional Windows PCs or phones. Which of the following malware categories BEST describes this program? A. Zero-day B. Trojan C. Virus D. Rootkit

Answer: C Explanation: A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. Viruses can also replicate themselves. All computer viruses are man-made. A simple virus that can make a copy of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt. An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems. Some people distinguish between general viruses and worms. A worm is a special type of virus that can replicate itself and use memory, but cannot attach itself to other programs.

QUESTION NO: 446 The Chief Information Officer (CIO) receives an anonymous threatening message that says "beware of the 1st of the year". The CIO suspects the message may be from a former disgruntled employee planning an attack. Which of the following should the CIO be concerned with? A. Smurf Attack B. Trojan C. Logic bomb D. Virus

Answer: C Explanation: A logic bomb is a piece of code intentionally inserted into a software system that will set off a malicious function when specified conditions are met. For example, a programmer may hide a piece of code that starts deleting files should they ever be terminated from the company. Software that is inherently malicious, such as viruses and worms, often contain logic bombs that execute a certain payload at a pre-defined time or when some other condition is met. This technique can be used by a virus or worm to gain momentum and spread before being noticed. Some viruses attack their host systems on specific dates, such as Friday the 13th or April Fool's Day. Trojans that activate on certain dates are often called "time bombs". To be considered a logic bomb, the payload should be unwanted and unknown to the user of the software. As an example, trial programs with code that disables certain functionality after a set time are not normally regarded as logic bombs.

QUESTION NO: 459 Which of the following attacks could be used to initiate a subsequent man-in-the-middle attack? A. ARP poisoning B. DoS C. Replay D. Brute force

Answer: C Explanation: A replay attack (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by IP packet substitution (such as stream cipher attack). For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (posing as Alice) connects to Bob; when asked for a proof of identity, Eve sends Alice's password (or hash) read from the last session, which Bob accepts thus granting access to Eve. Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a one-time token to Alice, which Alice uses to transform the password and send the result to Bob (e.g. computing a hash function of the session token appended to the password). On his side Bob performs the same computation; if and only if both values match, the login is successful. Now suppose Eve has captured this value and tries to use it on another session; Bob sends a different session token, and when Eve replies with the captured value it will be different from Bob's computation. Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as Bob, presenting some predicted future token, and convince Alice to use that token in her transformation. Eve can then replay her reply at a later time (when the previously predicted token is actually presented by Bob), and Bob will accept the authentication. One-time passwords are similar to session tokens in that the password expires after it has been used or after a very short amount of time. They can be used to authenticate individual transactions in addition to sessions. The technique has been widely implemented in personal online banking systems. Bob can also send nonces but should then include a message authentication code (MAC), which Alice should check. Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a secure protocol. For example Bob periodically broadcasts the time on his clock together with a MAC. When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her message, which is also authenticated. Bob only accepts messages for which the timestamp is within a reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-) random numbers, with the trade-off being that replay attacks, if they are performed quickly enough i.e. within that 'reasonable' limit, could succeed.

QUESTION NO: 517 Which statement is TRUE about the operation of a packet sniffer? A. It can only have one interface on a management network. B. They are required for firewall operation and stateful inspection. C. The Ethernet card must be placed in promiscuous mode. D. It must be placed on a single virtual LAN interface.

Answer: C Explanation: A sniffer (packet sniffer) is a tool that intercepts data flowing in a network. If computers are connected to a local area network that is not filtered or switched, the traffic can be broadcast to all computers contained in the same segment. This doesn't generally occur, since computers are generally told to ignore all the comings and goings of traffic from other computers. However, in the case of a sniffer, all traffic is shared when the sniffer software commands the Network Interface Card (NIC) to stop ignoring the traffic. The NIC is put into promiscuous mode, and it reads communications between computers within a particular segment. This allows the sniffer to seize everything that is flowing in the network, which can lead to the unauthorized access of sensitive data. A packet sniffer can take the form of either a hardware or software solution. A sniffer is also known as a packet analyzer.

QUESTION NO: 467 Several users' computers are no longer responding normally and sending out spam email to the users' entire contact list. This is an example of which of the following? A. Trojan virus B. Botnet C. Worm outbreak D. Logic bomb

Answer: C Explanation: A worm is similar to a virus but is typically less malicious. A virus will usually cause damage to the system or files whereas a worm will usually just spread itself either using the network or by sending emails. A computer worm is a standalone malware computer program that replicates itself in order to spread to other computers. Often, it uses a computer network to spread itself, relying on security failures on the target computer to access it. Unlike a computer virus, it does not need to attach itself to an existing program. Worms almost always cause at least some harm to the network, even if only by consuming bandwidth, whereas viruses almost always corrupt or modify files on a targeted computer.

QUESTION NO: 475 Which of the following would BEST deter an attacker trying to brute force 4-digit PIN numbers to access an account at a bank teller machine? A. Account expiration settings B. Complexity of PIN C. Account lockout settings D. PIN history requirements

Answer: C Explanation: Account lockout settings determine the number of failed login attempts before the account gets locked and how long the account will be locked out for. For example, an account can be configured to lock if three incorrect passwords (or in this case PIN's) are entered. The account can then be configured to automatically unlock after a period of time or stay locked until someone manually unlocks it.

QUESTION NO: 438 Which of the following malware types may require user interaction, does not hide itself, and is commonly identified by marketing pop-ups based on browsing habits? A. Botnet B. Rootkit C. Adware D. Virus

Answer: C Explanation: Adware is free software that is supported by advertisements. Common adware programs are toolbars, games and utilities. They are free to use, but require you to watch advertisements as long as the programs are open. Adware typically requires an active Internet connection to run.

QUESTION NO: 526 Which of the following BEST describes a protective countermeasure for SQL injection? A. Eliminating cross-site scripting vulnerabilities B. Installing an IDS to monitor network traffic C. Validating user input in web applications D. Placing a firewall between the Internet and database servers

Answer: C Explanation: By validating user input and preventing special characters, we can prevent the injection of clientside scripting code. SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

QUESTION NO: 519 Which of the following software allows a network administrator to inspect the protocol header in order to troubleshoot network issues? A. URL filter B. Spam filter C. Packet sniffer D. Switch

Answer: C Explanation: Every data packet transmitted across a network has a protocol header. To view a protocol header, you need to capture and view the contents of the packet with a packet sniffer. A sniffer (packet sniffer) is a tool that intercepts data flowing in a network. If computers are connected to a local area network that is not filtered or switched, the traffic can be broadcast to all computers contained in the same segment. This doesn't generally occur, since computers are generally told to ignore all the comings and goings of traffic from other computers. However, in the case of a sniffer, all traffic is shared when the sniffer software commands the Network Interface Card (NIC) to stop ignoring the traffic. The NIC is put into promiscuous mode, and it reads communications between computers within a particular segment. This allows the sniffer to seize everything that is flowing in the network, which can lead to the unauthorized access of sensitive data. A packet sniffer can take the form of either a hardware or software solution. A sniffer is also known as a packet analyzer.

QUESTION NO: 490 A security administrator forgets their card to access the server room. The administrator asks a coworker if they could use their card for the day. Which of the following is the administrator using to gain access to the server room? A. Man-in-the-middle B. Tailgating C. Impersonation D. Spoofing

Answer: C Explanation: Impersonation is where a person, computer, software application or service pretends to be someone or something it's not. Impersonation is commonly non-maliciously used in client/server applications. However, it can also be used as a security threat. In this question, by using the coworker's card, the security administrator is 'impersonating' the coworker. The server room locking system and any logging systems will 'think' that the coworker has entered the server room.

QUESTION NO: 442 Sara, a user, downloads a keygen to install pirated software. After running the keygen, system performance is extremely slow and numerous antivirus alerts are displayed. Which of the following BEST describes this type of malware? A. Logic bomb B. Worm C. Trojan D. Adware

Answer: C Explanation: In computers, a Trojan is a program in which malicious or harmful code is contained inside apparently harmless programming or data in such a way that it can get control and do its chosen form of damage, such as ruining the file allocation table on your hard disk. In one celebrated case, a Trojan was a program that was supposed to find and destroy computer viruses. A Trojan horse may be widely redistributed as part of a computer virus.

QUESTION NO: 502 After viewing wireless traffic, an attacker notices the following networks are being broadcasted by local access points: Corpnet Coffeeshop FreePublicWifi Using this information the attacker spoofs a response to make nearby laptops connect back to a malicious device. Which of the following has the attacker created? A. Infrastructure as a Service B. Load balancer C. Evil twin D. Virtualized network

Answer: C Explanation: In this question, the attacker has created another wireless network that is impersonating one of more of the three wireless networks listed in the question. This is known as an Evil Twin. An evil twin, in the context of network security, is a rogue or fake wireless access point (WAP) that appears as a genuine hotspot offered by a legitimate provider. In an evil twin attack, an eavesdropper or hacker fraudulently creates this rogue hotspot to collect the personal data of unsuspecting users. Sensitive data can be stolen by spying on a connection or using a phishing technique. For example, a hacker using an evil twin exploit may be positioned near an authentic Wi-Fi access point and discover the service set identifier (SSID) and frequency. The hacker may then send a radio signal using the exact same frequency and SSID. To end users, the rogue evil twin appears as their legitimate hotspot with the same name. In wireless transmissions, evil twins are not a new phenomenon. Historically, they were known as honeypots or base station clones. With the advancement of wireless technology and the use of wireless devices in public areas, it is very easy for novice users to set up evil twin exploits.

QUESTION NO: 476 Which of the following can be used by a security administrator to successfully recover a user's forgotten password on a password protected file? A. Cognitive password B. Password sniffing C. Brute force D. Social engineering

Answer: C Explanation: One way to recover a user's forgotten password on a password protected file is to guess it. A brute force attack is an automated attempt to open the file by using many different passwords. A brute force attack is a trial-and-error method used to obtain information such as a user password or personal identification number (PIN). In a brute force attack, automated software is used to generate a large number of consecutive guesses as to the value of the desired data. Brute force attacks may be used by criminals to crack encrypted data, or by security analysts to test an organization's network security. A brute force attack may also be referred to as brute force cracking. For example, a form of brute force attack known as a dictionary attack might try all the words in a dictionary. Other forms of brute force attack might try commonly-used passwords or combinations of letters and numbers. An attack of this nature can be time- and resource-consuming. Hence the name "brute force attack;" success is usually based on computing power and the number of combinations tried rather than an ingenious algorithm.

QUESTION NO: 529 The string: ' or 1=1-- - Represents which of the following? A. Bluejacking B. Rogue access point C. SQL Injection D. Client-side attacks

Answer: C Explanation: The code in the question is an example of a SQL Injection attack. The code '1=1' will always provide a value of true. This can be included in statement designed to return all rows in a SQL table. SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

QUESTION NO: 497 Users have been reporting that their wireless access point is not functioning. They state that it allows slow connections to the internet, but does not provide access to the internal network. The user provides the SSID and the technician logs into the company's access point and finds no issues. Which of the following should the technician do? A. Change the access point from WPA2 to WEP to determine if the encryption is too strong B. Clear all access logs from the AP to provide an up-to-date access list of connected users C. Check the MAC address of the AP to which the users are connecting to determine if it is an imposter D. Reconfigure the access point so that it is blocking all inbound and outbound traffic as a troubleshooting gap

Answer: C Explanation: The users may be connecting to a rogue access point. The rogue access point could be hosting a wireless network that has the same SSID as the corporate wireless network. The only way to tell for sure if the access point the users are connecting to is the correct one is to check the MAC address. Every network card has a unique 48-bit address assigned. A media access control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet and WiFi. Logically, MAC addresses are used in the media access control protocol sublayer of the OSI reference model. MAC addresses are most often assigned by the manufacturer of a network interface controller (NIC) and are stored in its hardware, such as the card's read-only memory or some other firmware mechanism. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number and may be referred to as the burned-in address (BIA). It may also be known as an Ethernet hardware address (EHA), hardware address or physical address. This can be contrasted to a programmed address, where the host device issues commands to the NIC to use an arbitrary address. A network node may have multiple NICs and each NIC must have a unique MAC address. MAC addresses are formed according to the rules of one of three numbering name spaces managed by the Institute of Electrical and Electronics Engineers (IEEE): MAC-48, EUI-48, and EUI-64.

QUESTION NO: 491 Sara, an attacker, is recording a person typing in their ID number into a keypad to gain access to the building. Sara then calls the helpdesk and informs them that their PIN no longer works and would like to change it. Which of the following attacks occurred LAST? A. Phishing B. Shoulder surfing C. Impersonation D. Tailgating

Answer: C Explanation: Two attacks took place in this question. The first attack was shoulder surfing. This was the act of Sara recording a person typing in their ID number into a keypad to gain access to the building. The second attack was impersonation. Sara called the helpdesk and used the PIN to impersonate the person she recorded.

QUESTION NO: 482 All executive officers have changed their monitor location so it cannot be easily viewed when passing by their offices. Which of the following attacks does this action remediate? A. Dumpster Diving B. Impersonation C. Shoulder Surfing D. Whaling

Answer: C Explanation: Viewing confidential information on someone's monitor is known as shoulder surfing. By moving their monitors so they cannot be seen, the executives are preventing users passing by 'shoulder surfing'. Shoulder surfing is using direct observation techniques, such as looking over someone's shoulder, to get information. Shoulder surfing is an effective way to get information in crowded places because it's relatively easy to stand next to someone and watch as they fill out a form, enter a PIN number at an ATM machine, or use a calling card at a public pay phone. Shoulder surfing can also be done long distance with the aid of binoculars or other vision-enhancing devices. To prevent shoulder surfing, experts recommend that you shield paperwork or your keypad from view by using your body or cupping your hand.

QUESTION NO: 470 Purchasing receives an automated phone call from a bank asking to input and verify credit card information. The phone number displayed on the caller ID matches the bank. Which of the following attack types is this? A. Hoax B. Phishing C. Vishing D. Whaling

Answer: C Explanation: Vishing (voice or VoIP phishing) is an electronic fraud tactic in which individuals are tricked into revealing critical financial or personal information to unauthorized entities. Vishing works like phishing but does not always occur over the Internet and is carried out using voice technology. A vishing attack can be conducted by voice email, VoIP (voice over IP), or landline or cellular telephone. The potential victim receives a message, often generated by speech synthesis, indicating that suspicious activity has taken place in a credit card account, bank account, mortgage account or other financial service in their name. The victim is told to call a specific telephone number and provide information to "verify identity" or to "ensure that fraud does not occur." If the attack is carried out by telephone, caller ID spoofing can cause the victim's set to indicate a legitimate source, such as a bank or a government agency. Vishing is difficult for authorities to trace, particularly when conducted using VoIP. Furthermore, like many legitimate customer services, vishing scams are often outsourced to other countries, which may render sovereign law enforcement powerless. Consumers can protect themselves by suspecting any unsolicited message that suggests they are targets of illegal activity, no matter what the medium or apparent source. Rather than calling a number given in any unsolicited message, a consumer should directly call the institution named, using a number that is known to be valid, to verify all recent activity and to ensure that the account information has not been tampered with.

QUESTION NO: 520 A security administrator discovered that all communication over the company's encrypted wireless network is being captured by savvy employees with a wireless sniffing tool and is then being decrypted in an attempt to steal other employee's credentials. Which of the following technology is MOST likely in use on the company's wireless? A. WPA with TKIP B. VPN over open wireless C. WEP128-PSK D. WPA2-Enterprise

Answer: C Explanation: WEP's major weakness is its use of static encryption keys. When you set up a router with a WEP encryption key, that one key is used by every device on your network to encrypt every packet that's transmitted. But the fact that packets are encrypted doesn't prevent them from being intercepted, and due to some esoteric technical flaws it's entirely possible for an eavesdropper to intercept enough WEP-encrypted packets to eventually deduce what the key is. This problem used to be something you could mitigate by periodically changing the WEP key (which is why routers generally allow you to store up to four keys). But few bother to do this because changing WEP keys is inconvenient and time-consuming because it has to be done not just on the router, but on every device that connects to it. As a result, most people just set up a single key and then continue using it ad infinitum. Even worse, for those that do change the WEP key, new research and developments reinforce how even changing WEP keys frequently is no longer sufficient to protect a WLAN. The process of 'cracking' a WEP key used to require that a malicious hacker intercept millions of packets plus spend a fair amount of time and computing power. Researchers in the computer science department of a German university recently demonstrated the capability to compromise a WEPprotected network very quickly. After spending less than a minute intercepting data (fewer than 100,000 packets in all) they were able to compromise a WEP key in just three seconds.

QUESTION NO: 441 Which of the following malware types typically allows an attacker to monitor a user's computer, is characterized by a drive-by download, and requires no user interaction? A. Virus B. Logic bomb C. Spyware D. Adware

Answer: C Explanation: Explanation Spyware is software that is used to gather information about a person or organization without their knowledge and sends that information to another entity.

QUESTION NO: 536 A malicious individual is attempting to write too much data to an application's memory. Which of the following describes this type of attack? A. Zero-day B. SQL injection C. Buffer overflow D. XSRF

Answer: C Explanation: Explanation: A buffer overflow occurs when a program or process tries to store more data in a buffer (temporary data storage area) than it was intended to hold. Since buffers are created to contain a finite amount of data, the extra information - which has to go somewhere - can overflow into adjacent buffers, corrupting or overwriting the valid data held in them. Although it may occur accidentally through programming error, buffer overflow is an increasingly common type of security attack on data integrity. In buffer overflow attacks, the extra data may contain codes designed to trigger specific actions, in effect sending new instructions to the attacked computer that could, for example, damage the user's files, change data, or disclose confidential information. Buffer overflow attacks are said to have arisen because the C programming language supplied the framework, and poor programming practices supplied the vulnerability.

QUESTION NO: 458 An administrator is assigned to monitor servers in a data center. A web server connected to the Internet suddenly experiences a large spike in CPU activity. Which of the following is the MOST likely cause? A. Spyware B. Trojan C. Privilege escalation D. DoS

Answer: D Explanation: A Distributed Denial of Service (DDoS) attack is a DoS attack from multiple computers whereas a DoS attack is from a single computer. In terms of the actual method of attack, DDoS and DoS attacks are the same. One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable. Such attacks usually lead to a server overload. A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems (for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time. Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.

QUESTION NO: 445 Two programmers write a new secure application for the human resources department to store personal identifiable information. The programmers make the application available to themselves using an uncommon port along with an ID and password only they know. This is an example of which of the following? A. Root Kit B. Spyware C. Logic Bomb D. Backdoor

Answer: D Explanation: A backdoor in a computer system (or cryptosystem or algorithm) is a method of bypassing normal authentication, securing unauthorized remote access to a computer, obtaining access to plaintext, and so on, while attempting to remain undetected. The backdoor may take the form of an installed program (e.g., Back Orifice) or may subvert the system through a rootkit. A backdoor in a login system might take the form of a hard coded user and password combination which gives access to the system. Although the number of backdoors in systems using proprietary software (software whose source code is not publicly available) is not widely credited, they are nevertheless frequently exposed. Programmers have even succeeded in secretly installing large amounts of benign code as Easter eggs in programs, although such cases may involve official forbearance, if not actual permission. Many computer worms, such as Sobig and Mydoom, install a backdoor on the affected computer (generally a PC on broadband running Microsoft Windows and Microsoft Outlook). Such backdoors appear to be installed so that spammers can send junk e-mail from the infected machines. Others, such as the Sony/BMG rootkit distributed silently on millions of music CDs through late 2005, are intended as DRM measures—and, in that case, as data gathering agents, since both surreptitious programs they installed routinely contacted central servers.

QUESTION NO: 461 Timestamps and sequence numbers act as countermeasures against which of the following types of attacks? A. Smurf B. DoS C. Vishing D. Replay

Answer: D Explanation: A replay attack (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by IP packet substitution (such as stream cipher attack). For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (posing as Alice) connects to Bob; when asked for a proof of identity, Eve sends Alice's password (or hash) read from the last session, which Bob accepts thus granting access to Eve. Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a onetime token to Alice, which Alice uses to transform the password and send the result to Bob (e.g. computing a hash function of the session token appended to the password). On his side Bob performs the same computation; if and only if both values match, the login is successful. Now suppose Eve has captured this value and tries to use it on another session; Bob sends a different session token, and when Eve replies with the captured value it will be different from Bob's computation. Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as Bob, presenting some predicted future token, and convince Alice to use that token in her transformation. Eve can then replay her reply at a later time (when the previously predicted token is actually presented by Bob), and Bob will accept the authentication. One-time passwords are similar to session tokens in that the password expires after it has been used or after a very short amount of time. They can be used to authenticate individual transactions in addition to sessions. The technique has been widely implemented in personal online banking systems. Bob can also send nonces but should then include a message authentication code (MAC), which Alice should check. Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a secure protocol. For example Bob periodically broadcasts the time on his clock together with a MAC. When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her message, which is also authenticated. Bob only accepts messages for which the timestamp is within a reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-) random numbers, with the trade-off being that replay attacks, if they are performed quickly enough i.e. within that 'reasonable' limit, could succeed.

QUESTION NO: 443 During a server audit, a security administrator does not notice abnormal activity. However, a network security analyst notices connections to unauthorized ports from outside the corporate network. Using specialized tools, the network security analyst also notices hidden processes running. Which of the following has MOST likely been installed on the server? A. SPIM B. Backdoor C. Logic bomb D. Rootkit

Answer: D Explanation: A rootkit is a collection of tools (programs) that enable administrator-level access to a computer or computer network. Typically, a cracker installs a rootkit on a computer after first obtaining userlevel access, either by exploiting a known vulnerability or cracking a password. Once the rootkit is installed, it allows the attacker to mask intrusion and gain root or privileged access to the computer and, possibly, other machines on the network. A rootkit may consist of spyware and other programs that: monitor traffic and keystrokes; create a "backdoor" into the system for the hacker's use; alter log files; attack other machines on the network; and alter existing system tools to escape detection. The presence of a rootkit on a network was first documented in the early 1990s. At that time, Sun and Linux operating systems were the primary targets for a hacker looking to install a rootkit. Today, rootkits are available for a number of operating systems, including Windows, and are increasingly difficult to detect on any network.

QUESTION NO: 518 Which of the following network devices is used to analyze traffic between various network interfaces? A. Proxies B. Firewalls C. Content inspection D. Sniffers

Answer: D Explanation: A sniffer (packet sniffer) is a tool that intercepts data flowing in a network. If computers are connected to a local area network that is not filtered or switched, the traffic can be broadcast to all computers contained in the same segment. This doesn't generally occur, since computers are generally told to ignore all the comings and goings of traffic from other computers. However, in the case of a sniffer, all traffic is shared when the sniffer software commands the Network Interface Card (NIC) to stop ignoring the traffic. The NIC is put into promiscuous mode, and it reads communications between computers within a particular segment. This allows the sniffer to seize everything that is flowing in the network, which can lead to the unauthorized access of sensitive data. A packet sniffer can take the form of either a hardware or software solution. A sniffer is also known as a packet analyzer.

QUESTION NO: 480 Ann an employee is visiting Joe, an employee in the Human Resources Department. While talking to Joe, Ann notices a spreadsheet open on Joe's computer that lists the salaries of all employees in her department. Which of the following forms of social engineering would BEST describe this situation? A. Impersonation B. Dumpster diving C. Tailgating D. Shoulder surfing

Answer: D Explanation: Ann was able to see the Spreadsheet on Joe's computer. This direct observation is known as shoulder surfing. Shoulder surfing is using direct observation techniques, such as looking over someone's shoulder, to get information. Shoulder surfing is an effective way to get information in crowded places because it's relatively easy to stand next to someone and watch as they fill out a form, enter a PIN number at an ATM machine, or use a calling card at a public pay phone. Shoulder surfing can also be done long distance with the aid of binoculars or other vision-enhancing devices. To prevent shoulder surfing, experts recommend that you shield paperwork or your keypad from view by using your body or cupping your hand.

QUESTION NO: 510 Which of the following attacks allows access to contact lists on cellular phones? A. War chalking B. Blue jacking C. Packet sniffing D. Bluesnarfing

Answer: D Explanation: Bluesnarfing is the theft of information from a wireless device through a Bluetooth connection. Bluetooth is a high-speed but very short-range wireless technology for exchanging data between desktop and mobile computers, personal digital assistants (PDAs), and other devices. By exploiting a vulnerability in the way Bluetooth is implemented on a mobile phone, an attacker can access information -- such as the user's calendar, contact list and e-mail and text messages -- without leaving any evidence of the attack. Other devices that use Bluetooth, such as laptop computers, may also be vulnerable, although to a lesser extent, by virtue of their more complex systems. Operating in invisible mode protects some devices, but others are vulnerable as long as Bluetooth is enabled.

QUESTION NO: 533 An attacker attempted to compromise a web form by inserting the following input into the username field: admin)(|(password=*)) Which of the following types of attacks was attempted? A. SQL injection B. Cross-site scripting C. Command injection D. LDAP injection

Answer: D Explanation: LDAP Injection is an attack used to exploit web based applications that construct LDAP statements based on user input. When an application fails to properly sanitize user input, it's possible to modify LDAP statements using a local proxy. This could result in the execution of arbitrary commands such as granting permissions to unauthorized queries, and content modification inside the LDAP tree. The same advanced exploitation techniques available in SQL Injection can be similarly applied in LDAP Injection. In a page with a user search form, the following code is responsible to catch input value and generate a LDAP query that will be used in LDAP database. <input type="text" size=20 name="userName">Insert the username</input> The LDAP query is narrowed down for performance and the underlying code for this function might be the following: String ldapSearchQuery = "(cn=" + $userName + ")"; System.out.println(ldapSearchQuery); If the variable $userName is not validated, it could be possible accomplish LDAP injection, as follows: If a user puts "*" on box search, the system may return all the usernames on the LDAP base If a user puts "jonys) (| (password = * ) )", it will generate the code bellow revealing jonys' password ( cn = jonys ) ( | (password = * ) )

QUESTION NO: 496 Pete, the security engineer, would like to prevent wireless attacks on his network. Pete has implemented a security control to limit the connecting MAC addresses to a single port. Which of the following wireless attacks would this address? A. Interference B. Man-in-the-middle C. ARP poisoning D. Rogue access point

Answer: D Explanation: MAC filtering is typically used in wireless networks. In computer networking, MAC Filtering (or GUI filtering, or layer 2 address filtering) refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network. MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. In this question, a rogue access point would need to be able to connect to the network to provide access to network resources. If the MAC address of the rogue access point isn't allowed to connect to the network port, then the rogue access point will not be able to connect to the network.

QUESTION NO: 450 A user, Ann, is reporting to the company IT support group that her workstation screen is blank other than a window with a message requesting payment or else her hard drive will be formatted. Which of the following types of malware is on Ann's workstation? A. Trojan B. Spyware C. Adware D. Ransomware

Answer: D Explanation: Ransomware is a type of malware which restricts access to the computer system that it infects, and demands a ransom paid to the creator(s) of the malware in order for the restriction to be removed. Some forms of ransomware encrypt files on the system's hard drive), while some may simply lock the system and display messages intended to coax the user into paying. Ransomware typically propagates as a trojan like a conventional computer worm, entering a system through, for example, a downloaded file or a vulnerability in a network service. The program will then run a payload: such as one that will begin to encrypt personal files on the hard drive. More sophisticated ransomware may hybrid-encrypt the victim's plaintext with a random symmetric key and a fixed public key. The malware author is the only party that knows the needed private decryption key. Some ransomware payloads do not use encryption. In these cases, the payload is simply an application designed to restrict interaction with the system, typically by setting the Windows Shell to itself, or even modifying the master boot record and/or partition table (which prevents the operating system from booting at all until it is repaired) Ransomware payloads utilize elements of scareware to extort money from the system's user. The payload may, for example, display notices purportedly issued by companies or law enforcement agencies which falsely claim that the system had been used for illegal activities, or contains illegal content such as pornography and pirated software or media. Some ransomware payloads imitate Windows' product activation notices, falsely claiming that their computer's Windows installation is counterfeit or requires re-activation. These tactics coax the user into paying the malware's author to remove the ransomware, either by supplying a program which can decrypt the files, or by sending an unlock code that undoes the changes the payload has made.

QUESTION NO: 466 Mike, a user, states that he is receiving several unwanted emails about home loans. Which of the following is this an example of? A. Spear phishing B. Hoaxes C. Spoofing D. Spam

Answer: D Explanation: Spam is most often considered to be electronic junk mail or junk newsgroup postings. Some people define spam even more generally as any unsolicited email. However, if a long-lost brother finds your email address and sends you a message, this could hardly be called spam, even though it is unsolicited. Real spam is generally email advertising for some product sent to a mailing list or newsgroup. In addition to wasting people's time with unwanted e-mail, spam also eats up a lot of network bandwidth. Consequently, there are many organizations, as well as individuals, who have taken it upon themselves to fight spam with a variety of techniques. But because the Internet is public, there is really little that can be done to prevent spam, just as it is impossible to prevent junk mail. However, some online services have instituted policies to prevent spammers from spamming their subscribers. There is some debate about why it is called spam, but the generally accepted version is that it comes from the Monty Python song, "Spam spam spam spam, spam spam spam spam, lovely spam, wonderful spam". Like the song, spam is an endless repetition of worthless text. Another school of thought maintains that it comes from the computer group lab at the University of Southern California who gave it the name because it has many of the same characteristics as the lunch meat Spam: Nobody wants it or ever asks for it. No one ever eats it; it is the first item to be pushed to the side when eating the entree. Sometimes it is actually tasty, like 1% of junk mail that is really useful to some people. The term spam can also be used to describe any "unwanted" email from a company or website -- typically at some point a user would have agreed to receive the email via subscription list opt-in -- a newer term called graymail is used to describe this particular type of spam.

QUESTION NO: 530 When an order was submitted via the corporate website, an administrator noted special characters (e.g., ";--" and "or 1=1 --") were input instead of the expected letters and numbers. Which of the following is the MOST likely reason for the unusual results? A. The user is attempting to highjack the web server session using an open-source browser. B. The user has been compromised by a cross-site scripting attack (XSS) and is part of a botnet performing DDoS attacks. C. The user is attempting to fuzz the web server by entering foreign language characters which are incompatible with the website. D. The user is sending malicious SQL injection strings in order to extract sensitive company or customer data via the website.

Answer: D Explanation: The code in the question is an example of a SQL Injection attack. The code '1=1' will always provide a value of true. This can be included in statement designed to return all rows in a SQL table. SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application's software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

QUESTION NO: 498 Ann, the network administrator, has learned from the helpdesk that employees are accessing the wireless network without entering their domain credentials upon connection. Once the connection is made, they cannot reach any internal resources, while wired network connections operate smoothly. Which of the following is MOST likely occurring? A. A user has plugged in a personal access point at their desk to connect to the network wirelessly. B. The company is currently experiencing an attack on their internal DNS servers. C. The company's WEP encryption has been compromised and WPA2 needs to be implemented instead. D. An attacker has installed an access point nearby in an attempt to capture company information.

Answer: D Explanation: The question implies that users should be required to enter their domain credentials upon connection to the wireless network. The fact that they are connecting to a wireless network without being prompted for their domain credentials and they are unable to access network resources suggests they are connecting to a rogue wireless network. A rogue access point is a wireless access point that has either been installed on a secure company network without explicit authorization from a local network administrator, or has been created to allow a hacker to conduct a man-in-the-middle attack. Rogue access points of the first kind can pose a security threat to large organizations with many employees, because anyone with access to the premises can install (maliciously or non-maliciously) an inexpensive wireless router that can potentially allow access to a secure network to unauthorized parties. Rogue access points of the second kind target networks that do not employ mutual authentication (client-server serverclient) and may be used in conjunction with a rogue RADIUS server, depending on security configuration of the target network. To prevent the installation of rogue access points, organizations can install wireless intrusion prevention systems to monitor the radio spectrum for unauthorized access points.

QUESTION NO: 479 Using proximity card readers instead of the traditional key punch doors would help to mitigate: A. Impersonation B. Tailgating C. Dumpster diving D. Shoulder surfing

Answer: D Explanation: Using a traditional key punch door, a person enters a code into a keypad to unlock the door. Someone could be watching the code being entered. They would then be able to open the door by entering the code. The process of watching the key code being entered is known as shoulder surfing. Shoulder surfing is using direct observation techniques, such as looking over someone's shoulder, to get information. Shoulder surfing is an effective way to get information in crowded places because it's relatively easy to stand next to someone and watch as they fill out a form, enter a PIN number at an ATM machine, or use a calling card at a public pay phone. Shoulder surfing can also be done long distance with the aid of binoculars or other vision-enhancing devices. To prevent shoulder surfing, experts recommend that you shield paperwork or your keypad from view by using your body or cupping your hand.

QUESTION NO: 469 Jane, an individual, has recently been calling various financial offices pretending to be another person to gain financial information. Which of the following attacks is being described? A. Phishing B. Tailgating C. Pharming D. Vishing

Answer: D Explanation: Vishing (voice or VoIP phishing) is an electronic fraud tactic in which individuals are tricked into revealing critical financial or personal information to unauthorized entities. Vishing works like phishing but does not always occur over the Internet and is carried out using voice technology. A vishing attack can be conducted by voice email, VoIP (voice over IP), or landline or cellular telephone. The potential victim receives a message, often generated by speech synthesis, indicating that suspicious activity has taken place in a credit card account, bank account, mortgage account or other financial service in their name. The victim is told to call a specific telephone number and provide information to "verify identity" or to "ensure that fraud does not occur." If the attack is carried out by telephone, caller ID spoofing can cause the victim's set to indicate a legitimate source, such as a bank or a government agency. Vishing is difficult for authorities to trace, particularly when conducted using VoIP. Furthermore, like many legitimate customer services, vishing scams are often outsourced to other countries, which may render sovereign law enforcement powerless. Consumers can protect themselves by suspecting any unsolicited message that suggests they are targets of illegal activity, no matter what the medium or apparent source. Rather than calling a number given in any unsolicited message, a consumer should directly call the institution named, using a number that is known to be valid, to verify all recent activity and to ensure that the account information has not been tampered with.

QUESTION NO: 512 After a user performed a war driving attack, the network administrator noticed several similar markings where WiFi was available throughout the enterprise. Which of the following is the term used to describe these markings? A. IV attack B. War dialing C. Rogue access points D. War chalking

Answer: D Explanation: War chalking is the act of making chalk marks on outdoor surfaces (walls, sidewalks, buildings, sign posts, trees) to indicate the existence of an open wireless network connection, usually offering an Internet connection so that others can benefit from the free wireless access. The open connections typically come from the access points of wireless networks located within buildings to serve enterprises. The chalk symbols indicate the type of access point that is available at that specific spot.

QUESTION NO: 501 The system administrator has been notified that many users are having difficulty connecting to the company's wireless network. They take a new laptop and physically go to the access point and connect with no problems. Which of the following would be the MOST likely cause? A. The certificate used to authenticate users has been compromised and revoked. B. Multiple war drivers in the parking lot have exhausted all available IPs from the pool to deny access. C. An attacker has gained access to the access point and has changed the encryption keys. D. An unauthorized access point has been configured to operate on the same channel.

Answer: D Explanation: Wireless Access Points can be configured to use a channel. If you have multiple access points within range of each other, you should configure the access points to use different channels. Different channels use different frequencies. If you have two access points using the same channel, their wifi signals will interfere with each other. The question states that that many users are having difficulty connecting to the company's wireless network. This is probably due to the signal being weakened by interference from another access point using the same channel. When the administrator takes a new laptop and physically goes to the access point and connects with no problems, he is able to connect because he is near the access point and therefore has a strong signal.

QUESTION NO: 534 Which of the following application attacks is used against a corporate directory service where there are unknown servers on the network? A. Rogue access point B. Zero day attack C. Packet sniffing D. LDAP injection

Answer: D Explanation: A directory service is accessed by using LDAP (Lightweight Directory Access Protocol). LDAP injection is an attack against a directory service. Just as SQL injection attacks take statements that are input by users and exploit weaknesses within, an LDAP injection attack exploits weaknesses in LDAP (Lightweight Directory Access Protocol) implementations. This can occur when the user's input is not properly filtered, and the result can be executed commands, modified content, or results returned to unauthorized queries. The best way to prevent LDAP injection attacks is to filter the user input and to use a validation scheme to make certain that queries do not contain exploits. One of the most common uses of LDAP is associated with user information. Numerous applications exist—such as employee directories—where users find other users by typing in a portion of their name. These queries are looking at the cn value or other fields (those defined for department, home directory, and so on). Someone attempting LDAP injection could feed unexpected values to the query to see what results are returned. All too often, finding employee information equates to finding usernames and values about those users that could be portions of their passwords.

Security+ 3.0 Threats and Vulnerabilities (20%)

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