USN-800-1: irssi vulnerability

13 July 2009

irssi vulnerability

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

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS

Software Description

  • irssi


It was discovered that irssi did not properly check the length of strings when processing WALLOPS messages. If a user connected to an IRC network where an attacker had IRC operator privileges, a remote attacker could cause a denial of service.

Update instructions

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

Ubuntu 9.04
irssi - 0.8.12-6ubuntu1.1
Ubuntu 8.10
irssi - 0.8.12-4ubuntu2.1
Ubuntu 8.04 LTS
irssi - 0.8.12-3ubuntu3.1
Ubuntu 6.06 LTS
irssi - 0.8.10-1ubuntu1.1

To update your system, please follow these instructions:

After a standard system upgrade you need to restart irssi to effect the necessary changes.