Ubuntu 14.10: USN-2500-1 Critical: Xorg-Server Information Leak

ubuntu

February 17, 2015

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

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)

Topics Covered

security advisory information leak critical ubuntu server issue xorg-server

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.