Headline
Ubuntu Security Notice USN-6555-1
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
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
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Debian Linux Security Advisory 5576-2 - The initial fix for CVE-2023-6377 as applied in DSA 5576-1 did not fully fix the vulnerability. Updated packages correcting this issue including the upstream merged commit are now available.
Ubuntu Security Notice 6555-2 - USN-6555-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. 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.
Ubuntu Security Notice 6555-2 - USN-6555-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. 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.
Debian Linux Security Advisory 5576-1 - Jan-Niklas Sohn discovered several vulnerabilities in the Xorg X server, which may result in privilege escalation if the X server is running privileged.
Debian Linux Security Advisory 5576-1 - Jan-Niklas Sohn discovered several vulnerabilities in the Xorg X server, which may result in privilege escalation if the X server is running privileged.
A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive information.
A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.