1. Ubuntu Security Notices
  2. USN-5569-1

USN-5569-1: Unbound vulnerabilities

Publication date

16 August 2022

Overview

Unbound could be made to cache rogue domain names.

Releases

Packages

  • unbound - validating, recursive, caching DNS resolver

Details

Xiang Li discovered that Unbound incorrectly handled delegation caching.
A remote attacker could use this issue to keep rogue domain names
resolvable long after they have been revoked.

Xiang Li discovered that Unbound incorrectly handled delegation caching.
A remote attacker could use this issue to keep rogue domain names
resolvable long after they have been revoked.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
22.04 jammy unbound –  1.13.1-1ubuntu5.1
libunbound8 –  1.13.1-1ubuntu5.1
20.04 focal unbound –  1.9.4-2ubuntu1.3
libunbound8 –  1.9.4-2ubuntu1.3
18.04 bionic libunbound2 –  1.6.7-1ubuntu2.5
unbound –  1.6.7-1ubuntu2.5

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References

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