CVE-2020-12667
First published: Tue May 19 2020(Updated: )
Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/knot-resolver | 5.3.1-1+deb11u1 5.6.0-1+deb12u1 5.7.4-2 | |
| Go-resolver | <5.1.1 |
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Reference Links
- http://cyber-security-group.cs.tau.ac.il/#
- http://www.openwall.com/lists/oss-security/2020/05/19/2
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
- https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12667
- https://nvd.nist.gov/vuln/detail/CVE-2020-12667
- https://launchpad.net/bugs/cve/CVE-2020-12667
- https://security-tracker.debian.org/tracker/CVE-2020-12667
- https://ubuntu.com/security/CVE-2020-12667
- https://gitlab.labs.nic.cz/knot/knot-resolver/-/commit/54f05e4d7b2e47c0bdd30b84272fc503cc65304b
- https://gitlab.labs.nic.cz/knot/knot-resolver/-/commit/ba7b89db780fe3884b4e90090318e25ee5afb118
Frequently Asked Questions
What is CVE-2020-12667?
CVE-2020-12667 is a vulnerability found in Knot Resolver before version 5.1.1.
What is the severity of CVE-2020-12667?
The severity of CVE-2020-12667 is high, with a severity value of 7.5.
How can CVE-2020-12667 be exploited?
CVE-2020-12667 can be exploited through traffic amplification via a crafted DNS answer from an attacker-controlled server.
How can I fix CVE-2020-12667?
To fix CVE-2020-12667, users should upgrade to Knot Resolver version 5.1.1 or later.
Where can I find more information about CVE-2020-12667?
You can find more information about CVE-2020-12667 at the following references: - http://cyber-security-group.cs.tau.ac.il/# - http://www.openwall.com/lists/oss-security/2020/05/19/2 - https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
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