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USN-5766-1: Heimdal vulnerability

7 December 2022

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

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Releases

Packages

  • heimdal - Heimdal Kerberos Network Authentication Protocol

Details

It was discovered that Heimdal did not properly manage memory when
normalizing Unicode. An attacker could possibly use this issue to
cause 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 20.04
Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

After a standard system update you need to restart any application
using Heimdal libraries to make all the necessary changes.

References

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Further reading