USN-402-1: Avahi vulnerability

5 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

Software Description


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 versions:

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.