USN-1200-1: Quassel vulnerability

10 September 2011

quassel vulnerability

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

  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS


A remote attacker could send crafted input to Quassel and cause it to crash.

Software Description

  • quassel - KDE/Qt-based IRC client


It was discovered that Quassel did not properly handle CTCP requests. A remote attacker could exploit this to cause a denial of service via application crash.

Update instructions

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

Ubuntu 11.04
quassel-core - 0.7.2-0ubuntu2.2
Ubuntu 10.10
quassel-core - 0.7.1-0ubuntu1.1
Ubuntu 10.04 LTS
quassel-core - 0.6.1-0ubuntu1.2

To update your system, please follow these instructions:

After a standard system update you need to restart Quassel to make all the necessary changes.