CVE-2023-26249

NameCVE-2023-26249
DescriptionKnot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

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+deb10u2vulnerable
bullseye5.3.1-1+deb11u1vulnerable
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-resolversource(unstable)5.6.0-1

Notes

[bullseye] - knot-resolver <no-dsa> (Minor issue)
[buster] - knot-resolver <no-dsa> (Minor issue)
https://www.knot-resolver.cz/2023-01-26-knot-resolver-5.6.0.html

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