USN-1803-1: X.Org X server vulnerability

17 April 2013

xorg-server, xorg-server-lts-quantal vulnerability

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS


The X server could be made to reveal keystrokes of other users.

Software Description

  • xorg-server - X.Org X server
  • xorg-server-lts-quantal - X.Org X server


It was discovered that the X.Org X server did not properly clear input events in certain circumstances. A local attacker with physical access could use this flaw to capture keystrokes.

Update instructions

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

Ubuntu 12.10
xserver-xorg-core - 2:1.13.0-0ubuntu6.2
Ubuntu 12.04 LTS
xserver-xorg-core - 2:1.11.4-0ubuntu10.13
xserver-xorg-core-lts-quantal - 2:1.13.0-0ubuntu6.1~precise3
Ubuntu 11.10
xserver-xorg-core - 2:1.10.4-1ubuntu4.5
Ubuntu 10.04 LTS
xserver-xorg-core - 2:1.7.6-2ubuntu7.12

To update your system, please follow these instructions:

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