CVE-2019-19331

NameCVE-2019-19331
Descriptionknot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3795-1
Debian Bugs946181

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
knot-resolver (PTS)buster (security), buster, buster (lts)3.2.1-3+deb10u2fixed
bullseye5.3.1-1+deb11u1fixed
bookworm (security), bookworm5.6.0-1+deb12u1fixed
sid, trixie5.7.4-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
knot-resolversourcebuster3.2.1-3+deb10u2DLA-3795-1
knot-resolversource(unstable)5.0.1-1946181

Notes

https://www.openwall.com/lists/oss-security/2019/12/04/4
Search for package or bug name: Reporting problems