DNS Zone Transfer

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DNS zone

A DNS namespace can be divided into multiple zones storing information about one or more DNS domains For each domain name in a zone, the zone is the authoritative source of information about that domain

Finding a DNS zone transfer vulnerability

Running nmap and finding port 53 open suggests a zone transfer could be attempted (most should fail)

Tools to automate DNS zone transfer

Sam Spade, axfr, dig

Why have DNS zone transfers

They are required to replicate and synchronise all copies of the zone used at each server configured to host the zone

Why have DNS zones

They provide availability and fault tolerance when resolving name queries

What is a zone transfer

Type of DNS transaction used to replicate DNS databases across a set of DNS servers

Executing a DNS zone transfer vulnerability

host -t ns example.com (find DNS servers for the domain) host -l example.com example2.com (pick one, and request a transfer) This will allow access to records stored on the DNS server

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