USN-6791-1: Unbound vulnerability

Releases

• Ubuntu 24.04 LTS
• Ubuntu 23.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

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.

Update instructions

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

Ubuntu 24.04

• 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

• libunbound8 - 1.13.1-1ubuntu5.5
• unbound - 1.13.1-1ubuntu5.5

Ubuntu 20.04

• 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

• CVE-2024-33655