USN-6168-2: libx11 vulnerability
20 June 2023
libx11 could be made to crash if it received specially crafted network traffic.
Releases
Packages
- libx11 - X11 client-side library
Details
USN-6168-1 fixed a vulnerability in libx11. This update provides
the corresponding update for Ubuntu 14.04 ESM, Ubuntu 16.04 ESM,
and Ubuntu 18.04 ESM.
Original advisory details:
Gregory James Duck discovered that libx11 incorrectly handled certain
Request, Event, or Error IDs. If a user were tricked into connecting to a
malicious X Server, a remote attacker could possibly use this issue to
cause libx11 to crash, resulting in a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
libx11-6
-
2:1.6.4-3ubuntu0.4+esm1
Available with Ubuntu Pro
Ubuntu 16.04
-
libx11-6
-
2:1.6.3-1ubuntu2.2+esm2
Available with Ubuntu Pro
Ubuntu 14.04
-
libx11-6
-
2:1.6.2-1ubuntu2.1+esm3
Available with Ubuntu Pro
After a standard system update you need to reboot your computer to make all
the necessary changes.
References
Related notices
- USN-6168-1: libx11-dev, libx11, libx11-6, libx11-doc, libx11-xcb-dev, libx11-data, libx11-xcb1