- Vulnerability/
- USN-6791-1
USN-6791-1: Unbound vulnerability
First published: Tue May 28 2024(Updated: )
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.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/libunbound8 | <1.19.2-1ubuntu3.1 | 1.19.2-1ubuntu3.1 |
| Ubuntu | =24.04 | |
| All of | ||
| ubuntu/unbound | <1.19.2-1ubuntu3.1 | 1.19.2-1ubuntu3.1 |
| Ubuntu | =24.04 | |
| All of | ||
| ubuntu/libunbound8 | <1.17.1-2ubuntu0.2 | 1.17.1-2ubuntu0.2 |
| Ubuntu | =23.10 | |
| All of | ||
| ubuntu/unbound | <1.17.1-2ubuntu0.2 | 1.17.1-2ubuntu0.2 |
| Ubuntu | =23.10 | |
| All of | ||
| ubuntu/libunbound8 | <1.13.1-1ubuntu5.5 | 1.13.1-1ubuntu5.5 |
| Ubuntu | =22.04 | |
| All of | ||
| ubuntu/unbound | <1.13.1-1ubuntu5.5 | 1.13.1-1ubuntu5.5 |
| Ubuntu | =22.04 | |
| All of | ||
| ubuntu/libunbound8 | <1.9.4-2ubuntu1.6 | 1.9.4-2ubuntu1.6 |
| Ubuntu | =20.04 | |
| All of | ||
| ubuntu/unbound | <1.9.4-2ubuntu1.6 | 1.9.4-2ubuntu1.6 |
| Ubuntu | =20.04 |
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Reference Links
- https://ubuntu.com/security/CVE-2024-33655
- 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
- https://ubuntu.com/security/notices/USN-6791-1 (Advisory)
Frequently Asked Questions
What is the severity of USN-6791-1?
USN-6791-1 addresses a denial of service vulnerability that allows DNS amplification attacks.
How do I fix USN-6791-1?
To fix USN-6791-1, update Unbound or libunbound8 to the specified remedial versions for your Ubuntu release.
Which versions of Unbound are affected by USN-6791-1?
USN-6791-1 affects Unbound versions prior to 1.19.2-1ubuntu3.1, 1.17.1-2ubuntu0.2, 1.13.1-1ubuntu5.5, and 1.9.4-2ubuntu1.6.
What is DNSBomb in relation to USN-6791-1?
DNSBomb is a type of denial of service amplification attack that exploits vulnerabilities in DNS resolvers like Unbound.
Which Ubuntu versions are impacted by USN-6791-1?
The impacted Ubuntu versions include 20.04, 22.04, 23.10, and 24.04.
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