[USN-4905-2] X.Org X Server vulnerability
Leonidas S. Barbosa
leo.barbosa at canonical.com
Wed Jun 30 17:18:22 UTC 2021
Ubuntu Security Notice USN-4905-2
June 30, 2021
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
X.Org X Server could be made to crash or run programs if it received
specially crafted input.
- xorg-server: X.Org X11 server
USN-4905-1 fixed a vulnerability in X.Org. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory 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.
The problem can be corrected by updating your system to the following
Ubuntu 14.04 ESM:
After a standard system update you need to reboot your computer to make all
the necessary changes.
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