1. Ubuntu Security Notices
  2. USN-2500-1

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

Publication date

17 February 2015

Overview

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)

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
14.10 utopic xserver-xorg-core –  2:1.16.0-1ubuntu1.3
14.04 trusty xserver-xorg-core –  2:1.15.1-0ubuntu2.7
xserver-xorg-core-lts-utopic –  2:1.16.0-1ubuntu1.2~trusty2
12.04 precise xserver-xorg-core –  2:1.11.4-0ubuntu10.17
xserver-xorg-core-lts-trusty –  2:1.15.1-0ubuntu2~precise5

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›