[USN-6453-2] X.Org X Server vulnerabilities
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Ubuntu Security Notice USN-6453-2
October 31, 2023
xorg-server vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)
Summary:
Several security issues were fixed in X.Org X Server, xwayland.
Software Description:
- xorg-server: X.Org X11 server
Details:
USN-6453-1 fixed several vulnerabilities in X.Org. This update provides
the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and
Ubuntu 18.04 LTS.
Original advisory details:
Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
prepending values to certain properties. An attacker could possibly use
this issue to cause the X Server to crash, execute arbitrary code, or
escalate privileges. (CVE-2023-5367)
Sri discovered that the X.Org X Server incorrectly handled detroying
windows in certain legacy multi-screen setups. An attacker could possibly
use this issue to cause the X Server to crash, execute arbitrary code, or
escalate privileges. (CVE-2023-5380)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS (Available with Ubuntu Pro):
xserver-xorg-core 2:1.19.6-1ubuntu4.15+esm1
xwayland 2:1.19.6-1ubuntu4.15+esm1
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
xserver-xorg-core 2:1.18.4-0ubuntu0.12+esm6
xwayland 2:1.18.4-0ubuntu0.12+esm6
Ubuntu 14.04 LTS (Available with Ubuntu Pro):
xserver-xorg-core 2:1.15.1-0ubuntu2.11+esm8
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6453-2
https://ubuntu.com/security/notices/USN-6453-1
CVE-2023-5367, CVE-2023-5380
A X.Org X Server security update has been released for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 18.04 LTS.
