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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12667
Reference (s):
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
- FEDORA:FEDORA-2020-bf68101ad3
- URL: https://lists.fedoraproject.org/archives/list/[email protected]/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/
- http://cyber-security-group.cs.tau.ac.il/#
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/