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Ubuntu Security Notice USN-2500-1
February 17, 2015

xorg-server, xorg-server-lts-trusty, xorg-server-lts-utopic vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

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

Software Description:
- xorg-server: X.Org X11 server
- xorg-server-lts-utopic: X.Org X11 server
- xorg-server-lts-trusty: X.Org X11 server

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:
  xserver-xorg-core               2:1.16.0-1ubuntu1.3

Ubuntu 14.04 LTS:
  xserver-xorg-core               2:1.15.1-0ubuntu2.7
  xserver-xorg-core-lts-utopic    2:1.16.0-1ubuntu1.2~trusty2

Ubuntu 12.04 LTS:
  xserver-xorg-core               2:1.11.4-0ubuntu10.17
  xserver-xorg-core-lts-trusty    2:1.15.1-0ubuntu2~precise5

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

References:
  http://www.ubuntu.com/usn/usn-2500-1
  CVE-2013-6424, CVE-2015-0255

Package Information:
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.16.0-1ubuntu1.3
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.15.1-0ubuntu2.7

https://launchpad.net/ubuntu/+source/xorg-server-lts-utopic/2:1.16.0-1ubuntu1.2~trusty2
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.11.4-0ubuntu10.17

https://launchpad.net/ubuntu/+source/xorg-server-lts-trusty/2:1.15.1-0ubuntu2~precise5