[USN-3802-1] X.Org X server vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Fri Oct 26 15:03:43 UTC 2018

Ubuntu Security Notice USN-3802-1
October 26, 2018

xorg-server, xorg-server-hwe-16.04 vulnerability

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS


X.Org X server could be made to overwrite files as the administrator.

Software Description:
- xorg-server: X.Org X11 server
- xorg-server-hwe-16.04: X.Org X11 server


Narendra Shinde discovered that the X.Org X server incorrectly handled
certain command line parameters when running as root with the legacy
wrapper. When certain graphics drivers are being used, a local attacker
could possibly use this issue to overwrite arbitrary files and escalate

Update instructions:

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

Ubuntu 18.10:
  xserver-xorg-core               2:1.20.1-3ubuntu2.1

Ubuntu 18.04 LTS:
  xserver-xorg-core               2:1.19.6-1ubuntu4.2

Ubuntu 16.04 LTS:
  xserver-xorg-core-hwe-16.04     2:1.19.6-1ubuntu4.1~16.04.2

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


Package Information:


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