1. Ubuntu Security Notices
  2. USN-3802-1

USN-3802-1: X.Org X server vulnerability

Publication date

26 October 2018

Overview

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

Releases

Packages

Details

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
privileges.

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
privileges.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
18.10 cosmic xserver-xorg-core –  2:1.20.1-3ubuntu2.1
18.04 bionic xserver-xorg-core –  2:1.19.6-1ubuntu4.2
16.04 xenial xserver-xorg-core-hwe-16.04 –  2:1.19.6-1ubuntu4.1~16.04.2

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References

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