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

13 April 2021

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

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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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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

References

Related notices

  • USN-4905-2: xdmx, xserver-xorg-core, xserver-common, xdmx-tools, xnest, xserver-xorg-dev, xserver-xorg-core-udeb, xorg-server-source, xserver-xorg-xmir, xorg-server, xvfb, xserver-xephyr