Ubuntu Security Notice USN-491-1
25th 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
Details
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 version:
- 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: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the
necessary changes.