USN-1349-1: X.Org vulnerability

26 January 2012

xorg vulnerability

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

  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS


X could be made to start by a user who lacked appropriate permissions.

Software Description

  • xorg - X.Org X Window System


It was discovered that the X wrapper incorrectly checked certain console permissions when launched by unprivileged users. An attacker connected remotely could use this flaw to start X, bypassing the console permissions check.

Update instructions

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

Ubuntu 11.10
xserver-xorg - 1:7.6+7ubuntu7.1
Ubuntu 11.04
xserver-xorg - 1:7.6+4ubuntu3.2
Ubuntu 10.10
xserver-xorg - 1:7.5+6ubuntu3.1
Ubuntu 10.04 LTS
xserver-xorg - 1:7.5+5ubuntu1.1

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.