USN-3453-1: X.Org X server vulnerabilities

12 October 2017

xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.04
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

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

Software Description

  • xorg-server - X.Org X11 server
  • xorg-server-hwe-16.04 - X.Org X11 server
  • xorg-server-lts-xenial - X.Org X11 server

Details

Michal Srb discovered that the X.Org X server incorrectly handled shared memory segments. An attacker able to connect to an X server, either locally or remotely, could use this issue to crash the server, or possibly replace shared memory segments of other X clients in the same session. (CVE-2017-13721)

Michal Srb discovered that the X.Org X server incorrectly handled XKB buffers. An attacker able to connect to an X server, either locally or remotely, could use this issue to crash the server, or possibly execute arbitrary code. (CVE-2017-13723)

Update instructions

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

Ubuntu 17.04
xserver-xorg-core - 2:1.19.3-1ubuntu1.2
Ubuntu 16.04 LTS
xserver-xorg-core - 2:1.18.4-0ubuntu0.6
xserver-xorg-core-hwe-16.04 - 2:1.19.3-1ubuntu1~16.04.3
Ubuntu 14.04 LTS
xserver-xorg-core - 2:1.15.1-0ubuntu2.10
xserver-xorg-core-lts-xenial - 2:1.18.3-1ubuntu2.3~trusty3

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References