CSA+ CH.5
Renee is responding to a security incident that resulted in the unavailability of a website critical to her company's operations. She is unsure of the amount of time and effort that it will take to recover the website. How should Renee classify the recoverability effort?
Extended recoverability effort occurs when the time to recovery is unpredictable. In those cases, additional resources and outside help are typically needed.
A cross-site scripting attack is an example of what type of threat vector?
A web attack is an attack executed from a website or web-based application—for example, a cross-site scripting attack used to steal credentials or redirect to a site that exploits a browser vulnerability and installs malware.
Security events are occurrences that may escalate into a security incident.
An event is any observable occurrence in a system or network. A security event includes any observable occurrence that relates to a security function. A security incident is a violation or imminent threat of violation of computer security policies, acceptable use policies, or standard security practices. Every incident consists of one or more event, but every event is not an incident.
A man-in-the-middle attack is an example of what type of threat vector?
An impersonation attack involves the replacement of something benign with something malicious—for example, spoofing, man-in-the-middle attacks, rogue wireless access points, and SQL injection attacks all involve impersonation.
Incident response playbooks contain detailed step-by-step instructions that guide the early response to a cybersecurity incident. Organizations typically have playbooks prepared for high-severity and frequently occurring incident types.
Incident response playbooks contain detailed step-by-step instructions that guide the early response to a cybersecurity incident. Organizations typically have playbooks prepared for high-severity and frequently occurring incident types.
Who is the best facilitator for a post-incident lessons-learned session?
Lessons-learned sessions are most effective when facilitated by an independent party who was not involved in the incident response effort.
Security event indicators include alerts, logs, publicly available information and people.
Alerts originate from intrusion detection and prevention systems, security information and event management systems, antivirus software, file integrity checking software, and third-party monitoring services. Logs are generated by operating systems, services, applications, network devices, and network flows. Publicly available information exists about new vulnerabilities and exploits detected "in the wild" or in a controlled laboratory environment. People from inside the organization or external sources report suspicious activity that may indicate that a security incident is in progress.
The cybersecurity incident response process has four phases.
The four phases of incident response are preparation; detection and analysis; containment, eradication, and recovery; and post-incident activities. The process is not a simple progression of steps from start to finish. Instead, it includes loops that allow responders to return to prior phases as needed during the response.
Response teams classify the severity of an incident.
The functional impact of an incident is the degree of impairment that it causes to the organization. The economic impact is the amount of financial loss that the organization incurs. In addition to measuring the functional and economic impact of a security incident, organizations should measure the time that services will be unavailable and the recoverability effort. Finally, the nature of the data involved in an incident also contributes to the severity as the information impact.
Robert is finishing a draft of a proposed incident response policy for his organization. Who would be the most appropriate person to sign the policy?
The incident response policy provides the CSIRT with the authority needed to do their job. Therefore, it should be approved by the highest possible level of authority within the organization, preferably the CEO.
Which one of the following parties is not commonly the target of external communications during an incident?
CSIRT members do not normally communicate directly with the perpetrator of a cybersecurity incident.
Grace is the CSIRT team leader for a business unit within NASA, a federal agency. What is the minimum amount of time that Grace must retain incident handling records?
National Archives General Records Schedule (GRS) 24 requires that all federal agencies retain incident handling records for at least three years.
Which one of the following is an example of an attrition attack?
An attrition attack employs brute-force methods to compromise, degrade, or destroy systems, networks, or services—for example, a DDoS attack intended to impair or deny access to a service or application or a brute-force attack against an authentication mechanism.
Which one of the following is an example of a computer security incident?
A former employee crashing a server is an example of a computer security incident because it is an actual violation of the availability of that system. An intruder breaking into a building may be a security event, but it is not necessarily a computer security event unless he or she performs some action affecting a computer system. A user accessing a secure file and an administrator changing a file permission settings are examples of security events but are not security incidents.
Alan is responsible for developing his organization's detection and analysis capabilities. He would like to purchase a system that can combine log records from multiple sources to detect potential security incidents. What type of system is best suited to meet Alan's security objective?
A security information and event management (SIEM) system correlates log entries from multiple sources and attempts to identify potential security incidents.
Which one of the following document types would outline the authority of a CSIRT responding to a security incident?
An organization's incident response policy should contain a clear description of the authority assigned to the CSIRT while responding to an active security incident.
Incidents may be classified according to the attack vector where they originate.
Common attack vectors for security incidents include external/removable media, attrition, the web, email, impersonation, improper usage, loss or theft of equipment, and other/unknown sources.
Which one of the following is not an objective of the containment, eradication, and recovery phase of incident response?
Detection of a potential incident occurs during the detection and analysis phase of incident response..
Karen is responding to a security incident that resulted from an intruder stealing files from a government agency. Those files contained unencrypted information about protected critical infrastructure. How should Karen rate the information impact of this loss?
In a proprietary breach, unclassified proprietary information is accessed or exfiltrated. Protected critical infrastructure information (PCII) is an example of unclassified proprietary information.
During what phase of the incident response process would an organization implement defenses designed to reduce the likelihood of a security incident?
Organizations should build solid, defense-in-depth approaches to cybersecurity during the preparation phase of the incident response process. The controls built during this phase serve to reduce the likelihood and impact of future incidents.
Which one of the following elements is not normally found in an incident response policy?
Procedures for rebuilding systems are highly technical and would normally be included in a playbook or procedure document rather than an incident response policy.
Matt is concerned about the fact that log records from his organization contain conflicting timestamps due to unsynchronized clocks. What protocol can he use to synchronize clocks throughout the enterprise?
The Network Time Protocol (NTP) provides a common source of time information that allows the synchronizing of clocks throughout an enterprise.
What phase of the incident response process would include measures designed to limit the damage caused by an ongoing breach?
The containment protocols contained in the containment, eradication, and recovery phases are designed to limit the damage caused by an ongoing security incident.
Incident response teams should represent diverse stakeholders.
The core incident response team normally consists of cybersecurity professionals with specific expertise in incident response. In addition to the core team members, the CSIRT may include representation from technical subject matter experts, IT support staff, legal counsel, human resources staff, and public relations and marketing teams.
Policies, procedures, and playbooks guide incident response efforts.
The incident response policy serves as the cornerstone of an organization's incident response program. This policy should be written to guide efforts at a high level and provide the authority for incident response. Procedures provide the detailed, tactical information that CSIRT members need when responding to an incident. CSIRT teams often develop playbooks that describe the specific procedures that they will follow in the event of a specific type of cybersecurity incident.
Ben is working to classify the functional impact of an incident. The incident has disabled email service for approximately 30 percent of his organization's staff. How should Ben classify the functional impact of this incident according to the NIST scale?
The definition of a medium functional impact is that the organization has lost the ability to provide a critical service to a subset of system users. That accurately describes the situation that Ben finds himself in. Assigning a low functional impact is only done when the organization can provide all critical services to all users at diminished efficiency. Assigning a high functional impact is only done if a critical service is not available to all users.
Hank is responding to a security event where the CEO of his company had her laptop stolen. The laptop was encrypted but contained sensitive information about the company's employees. How should Hank classify the information impact of this security event?
The event described in this scenario would not qualify as a security incident with measurable information impact. Although the laptop did contain information that might cause a privacy breach, that breach was avoided by the use of encryption to protect the contents of the laptop.
