1. Ubuntu Security Notices
  2. USN-4905-1

USN-4905-1: X.Org X Server vulnerability

Publication date

13 April 2021

Overview

X.Org X Server could be made to crash or run programs if it received specially crafted input.

Releases

Packages

Details

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
certain lengths of XInput extension ChangeFeedbackControl requests. An
attacker could use this issue to cause the server to crash, resulting in a
denial of service, or possibly execute arbitrary code.

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
certain lengths of XInput extension ChangeFeedbackControl requests. An
attacker could use this issue to cause the server to crash, resulting in a
denial of service, or possibly execute arbitrary code.

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
20.10 groovy xserver-xorg-core –  2:1.20.9-2ubuntu1.3
20.04 focal xserver-xorg-core –  2:1.20.9-2ubuntu1.2~20.04.2
18.04 bionic xserver-xorg-core –  2:1.19.6-1ubuntu4.9
xserver-xorg-core-hwe-18.04 –  2:1.20.8-2ubuntu2.2~18.04.5
16.04 xenial xserver-xorg-core –  2:1.18.4-0ubuntu0.12
xserver-xorg-core-hwe-16.04 –  2:1.19.6-1ubuntu4.1~16.04.6

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References

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