USN-6791-1: Unbound vulnerability

Publication date

28 May 2024

Overview

Unbound could be made to take part in a denial of service attack.


Packages

  • unbound - validating, recursive, caching DNS resolver

Details

It was discovered that Unbound could take part in a denial of service
amplification attack known as DNSBomb. This update introduces certain
resource limits to make the impact from Unbound significantly lower.

It was discovered that Unbound could take part in a denial of service
amplification attack known as DNSBomb. This update introduces certain
resource limits to make the impact from Unbound significantly lower.

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
24.04 noble libunbound8 –  1.19.2-1ubuntu3.1
unbound –  1.19.2-1ubuntu3.1
23.10 mantic libunbound8 –  1.17.1-2ubuntu0.2
unbound –  1.17.1-2ubuntu0.2
22.04 jammy libunbound8 –  1.13.1-1ubuntu5.5
unbound –  1.13.1-1ubuntu5.5
20.04 focal libunbound8 –  1.9.4-2ubuntu1.6
unbound –  1.9.4-2ubuntu1.6

Reduce your security exposure

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