CVE-2020-12667

NameCVE-2020-12667
DescriptionKnot 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs961076

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
knot-resolver (PTS)buster3.2.1-3vulnerable
bullseye, sid5.1.3-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
knot-resolversource(unstable)5.1.1-0.1961076

Notes

https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
commit: https://gitlab.labs.nic.cz/knot/knot-resolver/-/commit/54f05e4d7b2e47c0bdd30b84272fc503cc65304b
commit: https://gitlab.labs.nic.cz/knot/knot-resolver/-/commit/ba7b89db780fe3884b4e90090318e25ee5afb118
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