DNS zone transfer
 

  Vulnerability description
 The remote DNS server allows zone  transfers. DNS zone transfer, also sometimes known by its (most common) opcode  mnemonic AXFR, is a type of DNS transaction. It is one of the many mechanisms  available for administrators to employ for replicating the databases containing  the DNS data across a set of DNS servers.
DNS zone transfers have several  potential security issues. The data contained in an entire DNS zone may be  sensitive in nature. Individually, DNS records are not sensitive, but if a  malicious entity obtains a copy of the entire DNS zone for a domain, they may  have a complete listing of all hosts in that domain. That makes the job of a  computer hacker much easier. A computer hacker needs no special tools or access  to obtain a complete DNS zone if the name server is promiscuous and allows  anyone to do a zone transfer.