USN-491-1: Bind vulnerability

25 July 2007

bind9 vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 7.04
  • Ubuntu 6.10
  • Ubuntu 6.06 LTS

Software Description


A flaw was discovered in Bind’s sequence number generator. A remote attacker could calculate future sequence numbers and send forged DNS query responses. This could lead to client connections being directed to attacker-controlled hosts, resulting in credential theft and other attacks.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 7.04
libdns22 - 1:9.3.4-2ubuntu2.1
Ubuntu 6.10
libdns21 - 1:9.3.2-2ubuntu3.2
Ubuntu 6.06 LTS
libdns21 - 1:9.3.2-2ubuntu1.3

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the necessary changes.