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USN-4966-2: libx11 vulnerability

25 May 2021

libx11 could allow unintended access to services.

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Releases

Packages

  • libx11 - X11 client-side library

Details

USN-4966-1 fixed a vulnerability in libx11. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that libx11 incorrectly validated certain parameter
lengths. A remote attacker could possibly use this issue to trick libx11
into emitting extra X protocol requests.

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 16.04
Ubuntu 14.04

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

References

Related notices

  • USN-4966-1: libx11-dev, libx11-data, libx11-xcb-dev, libx11-6, libx11-6-udeb, libx11, libx11-doc, libx11-xcb1

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Further reading