[USN-5193-2] X.Org X Server vulnerabilities

========================================================================== Ubuntu Security Notice USN-5193-2 January 26, 2022
xorg-server vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM – Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in X.Org X Server.
Software Description: – xorg-server: X.Org X11 server
Details:
USN-5193-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory details:
Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 ESM: xserver-xorg-core 2:1.18.4-0ubuntu0.12+esm1
Ubuntu 14.04 ESM: xserver-xorg-core 2:1.15.1-0ubuntu2.11+esm5
After a standard system update you need to reboot your computer to make all the necessary changes.
References: ubuntu.com/security/notices/USN-5193-2 ubuntu.com/security/notices/USN-5193-1 CVE-2021-4008, CVE-2021-4009, CVE-2021-4011