USN-3453-1: X.Org X server vulnerabilities
Ubuntu Security Notice USN-3453-1
12th 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
Several security issues were fixed in the X.Org X server.
- xorg-server - X.Org X11 server
- xorg-server-hwe-16.04 - X.Org X11 server
- xorg-server-lts-xenial - X.Org X11 server
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.
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)
The problem can be corrected by updating your system to the following package version:
- 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.