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.
Releases
Packages
- xorg-server - X.Org X11 server
- xorg-server-hwe-16.04 - X.Org X11 server
- xorg-server-hwe-18.04 - X.Org X11 server
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.
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: xserver-xorg-dev, xorg-server, xserver-xorg-core-udeb, xdmx-tools, xorg-server-source, xnest, xserver-xorg-core, xvfb, xdmx, xserver-xephyr, xserver-xorg-xmir, xserver-common