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 |
|---|---|---|
| Nic Knot 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.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/
- https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
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/
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/references
- agent/last-modified-date
- agent/author
- agent/weakness
- agent/tags
- agent/first-publish-date
- agent/description
- agent/event
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- vendor/nic
- canonical/nic knot resolver