============================================================================ Ubuntu Security Notice USN-2500-1 February 17, 2015 xorg-server, xorg-server-lts-trusty, xorg-server-lts-utopic vulnerabilities ============================================================================ 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