USN-5193-2: X.Org X Server vulnerabilities

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• 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

• xserver-xorg-core - 2:1.18.4-0ubuntu0.12+esm1
  Available with Ubuntu Pro

Ubuntu 14.04

• xserver-xorg-core - 2:1.15.1-0ubuntu2.11+esm5
  Available with Ubuntu Pro

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

References

• CVE-2021-4009
• CVE-2021-4008
• CVE-2021-4011

Related notices

• USN-5193-1: xserver-xorg-dev, xserver-common, xserver-xorg-core, xvfb, xwayland-hwe-18.04, xorg-server, xorg-server-hwe-18.04, xserver-xephyr, xserver-xorg-core-hwe-18.04, xdmx, xorg-server-source-hwe-18.04, xserver-xephyr-hwe-18.04, xserver-xorg-legacy, xserver-xorg-dev-hwe-18.04, xwayland, xnest, xserver-xorg-legacy-hwe-18.04, xdmx-tools, xorg-server-source, xmir, xserver-xorg-xmir
• USN-5193-3: xorg-server-hwe-16.04, xorg-server-source-hwe-16.04, xserver-xephyr-hwe-16.04, xserver-xorg-core-hwe-16.04, xwayland-hwe-16.04, xserver-xorg-legacy-hwe-16.04, xserver-xorg-dev-hwe-16.04, xmir-hwe-16.04