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AUSCERT External Security Bulletin Redistribution
ESB-2021.2287
USN-4905-2: X.Org X Server vulnerability
1 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: X.Org X Server
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3472
Reference: ESB-2021.1283
ESB-2021.1229
ESB-2021.1227
Original Bulletin:
https://ubuntu.com/security/notices/USN-4905-2
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USN-4905-2: X.Org X Server vulnerability
30 June 2021
X.Org X Server could be made to crash or run programs if it received
specially crafted input.
Releases
o Ubuntu 14.04 ESM
Packages
o xorg-server - X.Org X11 server
Details
USN-4905-1 fixed a vulnerability in X.Org. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
certain lengths of XInput extension ChangeFeedbackControl requests. An
attacker could use this issue to cause the server to crash, resulting in a
denial of service, or possibly execute arbitrary code.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04
o xserver-xorg-core - 2:1.15.1-0ubuntu2.11+esm4
Available with UA Infra or UA Desktop
After a standard system update you need to reboot your computer to make all
the necessary changes.
References
o CVE-2021-3472
Related notices
o USN-4905-1 : xserver-xorg-core-hwe-16.04, xserver-xephyr-hwe-18.04,
xserver-xorg-dev-hwe-16.04, xserver-xorg-dev, xorg-server-hwe-16.04,
xorg-server-source-hwe-16.04, xserver-xorg-core-udeb, xwayland-hwe-16.04,
xorg-server-source, xserver-xorg-legacy-hwe-16.04,
xserver-xorg-core-hwe-18.04, xserver-xorg-dev-hwe-18.04, xnest,
xserver-common, xserver-xorg-core, xdmx-tools, xserver-xorg-xmir,
xserver-xorg-legacy-hwe-18.04, xserver-xorg-legacy, xorg-server-hwe-18.04,
xserver-xephyr, xdmx, xvfb, xwayland, xorg-server-source-hwe-18.04,
xserver-xephyr-hwe-16.04, xmir, xorg-server, xwayland-hwe-18.04,
xmir-hwe-16.04
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