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Ubuntu Security Notice USN-6791-1
May 28, 2024
unbound vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 24.04 LTS
- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
Unbound could be made to take part in a denial of service attack.
Software Description:
- 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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 24.04 LTS
   libunbound8                     1.19.2-1ubuntu3.1
   unbound                         1.19.2-1ubuntu3.1
Ubuntu 23.10
   libunbound8                     1.17.1-2ubuntu0.2
   unbound                         1.17.1-2ubuntu0.2
Ubuntu 22.04 LTS
   libunbound8                     1.13.1-1ubuntu5.5
   unbound                         1.13.1-1ubuntu5.5
Ubuntu 20.04 LTS
   libunbound8                     1.9.4-2ubuntu1.6
   unbound                         1.9.4-2ubuntu1.6
In general, a standard system update will make all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6791-1
   CVE-2024-33655
Package Information:
   https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.1
   https://launchpad.net/ubuntu/+source/unbound/1.17.1-2ubuntu0.2
   https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.5
   https://launchpad.net/ubuntu/+source/unbound/1.9.4-2ubuntu1.6