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USN-2500-1: X.Org X server vulnerabilities

17 February 2015

Several security issues were fixed in the X.Org X server.

Releases

Packages

Details

Olivier Fourdan discovered that the X.Org X server incorrectly handled
XkbSetGeometry requests resulting in an information leak. An attacker able
to connect to an X server, either locally or remotely, could use this issue
to possibly obtain sensitive information. (CVE-2015-0255)

It was discovered that the X.Org X server incorrectly handled certain
trapezoids. An attacker able to connect to an X server, either locally or
remotely, could use this issue to possibly crash the server. This issue
only affected Ubuntu 12.04 LTS. (CVE-2013-6424)

Update instructions

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

Ubuntu 14.10
Ubuntu 14.04
Ubuntu 12.04

After a standard system update you need to reboot your computer to make
all the necessary changes.