CVE-2023-50387

NameCVE-2023-50387
DescriptionCertain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3736-1, DSA-5620-1, DSA-5621-1, DSA-5626-1, DSA-5633-1
Debian Bugs1063845, 1063852

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
bind9 (PTS)buster1:9.11.5.P4+dfsg-5.1+deb10u7vulnerable
buster (security)1:9.11.5.P4+dfsg-5.1+deb10u10vulnerable
bullseye1:9.16.44-1~deb11u1vulnerable
bullseye (security)1:9.16.48-1fixed
bookworm1:9.18.19-1~deb12u1vulnerable
bookworm (security)1:9.18.24-1fixed
sid, trixie1:9.19.21-1fixed
dnsmasq (PTS)buster, buster (security)2.80-1+deb10u1vulnerable
bullseye2.85-1vulnerable
bookworm2.89-1vulnerable
trixie2.90-2fixed
sid2.90-3fixed
knot-resolver (PTS)buster3.2.1-3vulnerable
buster (security)3.2.1-3+deb10u1vulnerable
bullseye5.3.1-1+deb11u1vulnerable
bookworm5.6.0-1vulnerable
bookworm (security)5.6.0-1+deb12u1fixed
trixie5.7.1-1fixed
sid5.7.2-1fixed
pdns-recursor (PTS)buster, buster (security)4.1.11-1+deb10u1vulnerable
bullseye4.4.2-3vulnerable
bookworm4.8.4-1vulnerable
bookworm (security)4.8.7-1fixed
sid, trixie4.9.3-1fixed
systemd (PTS)buster241-7~deb10u8vulnerable
buster (security)241-7~deb10u10vulnerable
bullseye247.3-7+deb11u4vulnerable
bookworm252.22-1~deb12u1vulnerable
sid, trixie255.4-1fixed
unbound (PTS)buster1.9.0-2+deb10u2vulnerable
buster (security)1.9.0-2+deb10u4fixed
bullseye1.13.1-1+deb11u1vulnerable
bullseye (security)1.13.1-1+deb11u2fixed
bookworm1.17.1-2+deb12u1vulnerable
bookworm (security)1.17.1-2+deb12u2fixed
trixie1.19.1-1fixed
sid1.19.2-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
bind9sourcebullseye1:9.16.48-1DSA-5621-1
bind9sourcebookworm1:9.18.24-1DSA-5621-1
bind9source(unstable)1:9.19.21-1
dnsmasqsource(unstable)2.90-1
knot-resolversourcebookworm5.6.0-1+deb12u1DSA-5633-1
knot-resolversource(unstable)5.7.1-1
pdns-recursorsourcebookworm4.8.6-1DSA-5626-1
pdns-recursorsource(unstable)4.9.3-11063852
systemdsource(unstable)255.4-1
unboundsourcebuster1.9.0-2+deb10u4DLA-3736-1
unboundsourcebullseye1.13.1-1+deb11u2DSA-5620-1
unboundsourcebookworm1.17.1-2+deb12u2DSA-5620-1
unboundsource(unstable)1.19.1-11063845

Notes

[bullseye] - knot-resolver <ignored> (Too intrusive to backport, if DNSSEC is used Bookworm can be used)
[buster] - knot-resolver <ignored> (Too intrusive to backport)
[bullseye] - pdns-recursor <ignored> (Too intrusive to backport, if DNSSEC is used Bookworm can be used)
[bookworm] - systemd <no-dsa> (DNSSEC is disabled by default in systemd-resolved; can be fixed via point release)
[bullseye] - systemd <no-dsa> (DNSSEC is disabled by default in systemd-resolved; can be fixed via point release)
[buster] - systemd <no-dsa> (DNSSEC is disabled by default in systemd-resolved; can be fixed via point release)
https://kb.isc.org/docs/cve-2023-50387
https://gitlab.isc.org/isc-projects/bind9/-/commit/c12608ca934c0433d280e65fe6c631013e200cfe (v9.16.48)
https://gitlab.isc.org/isc-projects/bind9/-/commit/751b7cc4750ede6d8c5232751d60aad8ad84aa67 (v9.16.48)
https://gitlab.isc.org/isc-projects/bind9/-/commit/6a65a425283d70da86bf732449acd6d7c8dec718 (v9.16.48)
https://gitlab.isc.org/isc-projects/bind9/-/commit/3d206e918b3efbc20074629ad9d99095fbd2e5fd (v9.16.48)
https://gitlab.isc.org/isc-projects/bind9/-/commit/a520fbc0470a0d6b72db6aa0b8deda8798551614 (v9.16.48)
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html
https://github.com/CZ-NIC/knot-resolver/commit/7ddabe80fa05b76fc57b5a112a82a2c032032534
https://github.com/CZ-NIC/knot-resolver/commit/feb65eb97b93f0f024d70c7f5f6cbc6802ba02ec (v5.7.1)
https://github.com/CZ-NIC/knot-resolver/commit/cc5051b4441307d9b262fa382bc715391112ddbb (v5.7.1)
https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
https://nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt
Fixed by: https://github.com/NLnetLabs/unbound/commit/882903f2fa800c4cb6f5e225b728e2887bb7b9ae (release-1.19.1)
https://github.com/systemd/systemd/issues/31413
https://github.com/systemd/systemd/commit/67d0ce8843d612a2245d0966197d4f528b911b66 (v256)
https://github.com/systemd/systemd/commit/eba291124bc11f03732d1fc468db3bfac069f9cb (v256)
https://github.com/systemd/systemd-stable/commit/1ebdb19ff194120109b08bbf888bdcc502f83211 (v255.4)
https://github.com/systemd/systemd-stable/commit/572692f0bdd6a3fabe3dd4a3e8e5565cc69b5e14 (v255.4)
https://github.com/systemd/systemd-stable/commit/2f5edffa8ffd5210165ebe7604f07d23f375fe9a (v254.10)
https://github.com/systemd/systemd-stable/commit/9899281c59a91f19c8b39362d203e997d2faf233 (v254.10)
https://github.com/systemd/systemd-stable/commit/7886eea2425fe7773cc012da0b2e266e33d4be12 (v253.17)
https://github.com/systemd/systemd-stable/commit/156e519d990a5662c719a1cbe80c6a02a2b9115f (v253.17)
https://github.com/systemd/systemd-stable/commit/7633d969f3422f9ad380a512987d398e54764817 (v252.23)
https://github.com/systemd/systemd-stable/commit/b43bcb51ebf9aea21b1e280e1872056994e3f53d (v252.23)
systemd: DNSSEC is default to off in systemd-resolved

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