Here is an advisory from the Computer Emergency Response Team (CERT)
regarding the denial of service vulnerability in version 9 of the BIND
nameserver, up to 9.2.1. An attacker can send a properly crafted packet
which triggers a check within BIND and causes it to shut down. The
vulnerability can not be exploited for any purpose beyond denial of
service, but that is bad enough; if you are running BIND 9, an upgrade
is probably a good idea.
Note that many or most systems out there will still be running
BIND 8, and thus will not be vulnerable.
