- Vulnerability/
- USN-4374-1
USN-4374-1: Unbound vulnerabilities
First published: Wed May 27 2020(Updated: )
Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Unbound incorrectly handled certain queries. A remote attacker could use this issue to perform an amplification attack directed at a target. (CVE-2020-12662) It was discovered that Unbound incorrectly handled certain malformed answers. A remote attacker could possibly use this issue to cause Unbound to crash, resulting in a denial of service. (CVE-2020-12663)
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/libunbound8 | <1.9.4-2ubuntu1.1 | 1.9.4-2ubuntu1.1 |
| Ubuntu Linux | =20.04 | |
| All of | ||
| ubuntu/unbound | <1.9.4-2ubuntu1.1 | 1.9.4-2ubuntu1.1 |
| Ubuntu Linux | =20.04 | |
| All of | ||
| ubuntu/libunbound8 | <1.9.0-2ubuntu1.1 | 1.9.0-2ubuntu1.1 |
| Ubuntu Linux | =19.10 | |
| All of | ||
| ubuntu/unbound | <1.9.0-2ubuntu1.1 | 1.9.0-2ubuntu1.1 |
| Ubuntu Linux | =19.10 | |
| All of | ||
| ubuntu/libunbound2 | <1.6.7-1ubuntu2.3 | 1.6.7-1ubuntu2.3 |
| Ubuntu Linux | =18.04 | |
| All of | ||
| ubuntu/unbound | <1.6.7-1ubuntu2.3 | 1.6.7-1ubuntu2.3 |
| Ubuntu Linux | =18.04 |
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Reference Links
- https://ubuntu.com/security/CVE-2020-12662
- https://ubuntu.com/security/CVE-2020-12663
- https://launchpad.net/ubuntu/+source/unbound/1.9.4-2ubuntu1.1
- https://launchpad.net/ubuntu/+source/unbound/1.9.0-2ubuntu1.1
- https://launchpad.net/ubuntu/+source/unbound/1.6.7-1ubuntu2.3
- https://ubuntu.com/security/notices/USN-4374-1 (Advisory)
Frequently Asked Questions
What is the vulnerability ID of this advisory?
CVE-2020-12662
How can a remote attacker exploit this vulnerability?
By performing an amplification attack directed at a target.
What is the affected software?
Ubuntu 20.04 with Unbound 1.9.4-2ubuntu1.1 and libunbound8 1.9.4-2ubuntu1.1.
How can I fix this vulnerability?
Update to Unbound 1.9.4-2ubuntu1.1 and libunbound8 1.9.4-2ubuntu1.1.
Where can I find more information about this vulnerability?
You can find more information at the Ubuntu Security Advisory for CVE-2020-12662: https://ubuntu.com/security/CVE-2020-12662
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