Headline
Ubuntu Security Notice USN-6453-1
Ubuntu Security Notice 6453-1 - 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. Sri discovered that the X.Org X Server incorrectly handled destroying 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.
==========================================================================
Ubuntu Security Notice USN-6453-1
October 25, 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, xwayland.
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
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 23.10:
xserver-xorg-core 2:21.1.7-3ubuntu2.1
xwayland 2:23.2.0-1ubuntu0.1
Ubuntu 23.04:
xserver-xorg-core 2:21.1.7-1ubuntu3.1
xwayland 2:22.1.8-1ubuntu1.1
Ubuntu 22.04 LTS:
xserver-xorg-core 2:21.1.4-2ubuntu1.7~22.04.2
xwayland 2:22.1.1-1ubuntu0.7
Ubuntu 20.04 LTS:
xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.9
xwayland 2:1.20.13-1ubuntu1~20.04.9
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6453-1
CVE-2023-5367, CVE-2023-5380
Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.7-3ubuntu2.1
https://launchpad.net/ubuntu/+source/xwayland/2:23.2.0-1ubuntu0.1
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.7-1ubuntu3.1
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.8-1ubuntu1.1
https://launchpad.net/ubuntu/+source/xorg-server/2:21.1.4-2ubuntu1.7~22.04.2
https://launchpad.net/ubuntu/+source/xwayland/2:22.1.1-1ubuntu0.7
https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.13-1ubuntu1~20.04.9
Related news
Gentoo Linux Security Advisory 202401-30 - Multiple vulnerabilities have been discovered in the Xorg Server and XWayland, the worst of which can result in privilege escalation or remote code execution. Versions greater than or equal to 21.1.11 are affected.
Red Hat Security Advisory 2024-0010-03 - An update for tigervnc is now available for Red Hat Enterprise Linux 9. Issues addressed include an out of bounds write vulnerability.
Red Hat Security Advisory 2023-7533-01 - An update for tigervnc is now available for Red Hat Enterprise Linux 8.8 Extended Update Support. Issues addressed include an out of bounds write vulnerability.
Red Hat Security Advisory 2023-7526-01 - An update for tigervnc is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update Service, and Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions. Issues addressed include an out of bounds write vulnerability.
Red Hat Security Advisory 2023-7436-01 - An update for tigervnc is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Enterprise Linux 8.2 Telecommunications Update Service, and Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions. Issues addressed include an out of bounds write vulnerability.
Red Hat Security Advisory 2023-7428-01 - An update for tigervnc is now available for Red Hat Enterprise Linux 7. Issues addressed include out of bounds write and use-after-free vulnerabilities.
Debian Linux Security Advisory 5534-1 - 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 out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.
A use-after-free flaw was found in the xorg-x11-server. An X server crash may occur in a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode) if the pointer is warped from within a window on one screen to the root window of the other screen and if the original window is destroyed followed by another window being destroyed.