CVE-2020-12667

Name	CVE-2020-12667
Description	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	CVE (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 severity	medium
Debian Bugs	961076

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
knot-resolver (PTS)	buster	3.2.1-3	vulnerable
	sid	5.0.1-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
knot-resolver	source	(unstable)	(unfixed)			961076

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