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USN-6168-1: libx11 vulnerability

15 June 2023

libx11 could be made to crash if it received specially crafted network traffic.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Releases

Packages

  • libx11 - X11 client-side library

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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 23.04
Ubuntu 22.10
Ubuntu 22.04
Ubuntu 20.04

After a standard system update you need to reboot your computer to make all
the necessary changes.

References

Related notices

  • USN-6168-2: libx11-dev, libx11-doc, libx11-xcb-dev, libx11, libx11-xcb1, libx11-data, libx11-6