Ubuntu Security Notice 6555-1 - Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled XKB button actions. An attacker could possibly use this issue to cause the X Server to crash, execute arbitrary code, or escalate privileges. Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled memory when processing the RRChangeOutputProperty and RRChangeProviderProperty APIs. An attacker could possibly use this issue to cause the X Server to crash, or obtain sensitive information.
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Ubuntu Security Notice USN-6555-1
December 13, 2023
xorg-server, xwayland vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 23.10
- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in X.Org X Server.
Software Description:
- xorg-server: X.Org X11 server
- xwayland: X server for running X clients under Wayland
Details:
Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled XKB
button actions. An attacker could possibly use this issue to cause the X
Server to crash, execute arbitrary code, or escalate privileges.
(CVE-2023-6377)
Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
memory when processing the RRChangeOutputProperty and
RRChangeProviderProperty APIs. An attacker could possibly use this issue to
cause the X Server to crash, or obtain sensitive information.
(CVE-2023-6478)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 23.10:
xserver-xorg-core 2:21.1.7-3ubuntu2.4
xwayland 2:23.2.0-1ubuntu0.3
Ubuntu 23.04:
xserver-xorg-core 2:21.1.7-1ubuntu3.4
xwayland 2:22.1.8-1ubuntu1.3
Ubuntu 22.04 LTS:
xserver-xorg-core 2:21.1.4-2ubuntu1.7~22.04.5
xwayland 2:22.1.1-1ubuntu0.9
Ubuntu 20.04 LTS:
xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.12
xwayland 2:1.20.13-1ubuntu1~20.04.12
After a standard system update you need to reboot your computer to make all
the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6555-1
CVE-2023-6377, CVE-2023-6478
Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.7-3ubuntu2.4
https://launchpad.net/ubuntu/+source/xwayland/2:23.2.0-1ubuntu0.3
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.7-1ubuntu3.4
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.8-1ubuntu1.3
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.7~22.04.5
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.9
https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.12