USN-402-1: Avahi vulnerability

Ubuntu Security Notice USN-402-1

5th January, 2007

avahi vulnerability

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

  • Ubuntu 6.10
  • Ubuntu 6.06 LTS
  • Ubuntu 5.10


A flaw was discovered in Avahi's handling of compressed DNS packets. If
a specially crafted reply were received over the network, the Avahi
daemon would go into an infinite loop, causing a denial of service.

Update instructions

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

Ubuntu 6.10:
avahi-daemon 0.6.13-2ubuntu2.4
Ubuntu 6.06 LTS:
avahi-daemon 0.6.10-0ubuntu3.4
Ubuntu 5.10:
avahi-daemon 0.5.2-1ubuntu1.4

To update your system, please follow these instructions:

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