USN-5732-1: Unbound vulnerability

17 November 2022

Unbound could be made to stop responding if it received specially crafted network traffic.

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Releases

Packages

  • unbound - validating, recursive, caching DNS resolver

Details

It was discovered that Unbound incorrectly handled delegations with a large
number of non-responsive nameservers. A remote attacker could possibly use
this issue to cause Unbound to consume resources, leading to a denial of
service.

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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.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 22.10
Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.

References

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Further reading