Ubuntu: 1803-1: X.Org X server vulnerability
Posted by Benjamin D. Thomas   
Ubuntu The X server could be made to reveal keystrokes of other users.
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Ubuntu Security Notice USN-1803-1
April 17, 2013

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

Summary:

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

Details:

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

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

References:
  http://www.ubuntu.com/usn/usn-1803-1
  CVE-2013-1940

Package Information:
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.13.0-0ubuntu6.2
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.11.4-0ubuntu10.13

https://launchpad.net/ubuntu/+source/xorg-server-lts-quantal/2:1.13.0-0ubuntu6.1~precise3
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.10.4-1ubuntu4.5
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.7.6-2ubuntu7.12