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Ubuntu Security Notice USN-7080-1
October 22, 2024

unbound vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 24.10
• Ubuntu 24.04 LTS
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 LTS
• Ubuntu 16.04 LTS
• Ubuntu 14.04 LTS

Summary:

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

Software Description:

• unbound: validating, recursive, caching DNS resolver

Details:

Toshifumi Sakaguchi discovered that Unbound incorrectly handled name
compression for large RRsets, which could lead to excessive CPU usage.
An attacker could potentially use this issue to cause a denial of service
by sending specially crafted DNS responses.

Update instructions:

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

Ubuntu 24.10
libunbound8 1.20.0-1ubuntu2.1
unbound 1.20.0-1ubuntu2.1

Ubuntu 24.04 LTS
libunbound8 1.19.2-1ubuntu3.3
unbound 1.19.2-1ubuntu3.3

Ubuntu 22.04 LTS
libunbound8 1.13.1-1ubuntu5.8
unbound 1.13.1-1ubuntu5.8

Ubuntu 20.04 LTS
libunbound8 1.9.4-2ubuntu1.9
unbound 1.9.4-2ubuntu1.9

Ubuntu 18.04 LTS
libunbound2 1.6.7-1ubuntu2.6+esm3
Available with Ubuntu Pro
unbound 1.6.7-1ubuntu2.6+esm3
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libunbound2 1.5.8-1ubuntu1.1+esm2
Available with Ubuntu Pro
unbound 1.5.8-1ubuntu1.1+esm2
Available with Ubuntu Pro

Ubuntu 14.04 LTS
libunbound2 1.4.22-1ubuntu4.14.04.3+esm2
Available with Ubuntu Pro
unbound 1.4.22-1ubuntu4.14.04.3+esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7080-1
CVE-2024-8508

Package Information:
https://launchpad.net/ubuntu/+source/unbound/1.20.0-1ubuntu2.1
https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.3
https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.8
https://launchpad.net/ubuntu/+source/unbound/1.9.4-2ubuntu1.9