CVE-2023-50387

Name	CVE-2023-50387
Description	Certain 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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3736-1, DSA-5620-1, DSA-5621-1, DSA-5626-1, DSA-5633-1
Debian Bugs	1063845, 1063852

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
bind9 (PTS)	buster	1:9.11.5.P4+dfsg-5.1+deb10u7	vulnerable
	buster (security)	1:9.11.5.P4+dfsg-5.1+deb10u10	vulnerable
	bullseye	1:9.16.44-1~deb11u1	vulnerable
	bullseye (security)	1:9.16.48-1	fixed
	bookworm	1:9.18.19-1~deb12u1	vulnerable
	bookworm (security)	1:9.18.24-1	fixed
	trixie, sid	1:9.19.21-1	fixed
dnsmasq (PTS)	buster, buster (security)	2.80-1+deb10u1	vulnerable
	bullseye	2.85-1	vulnerable
	bookworm	2.89-1	vulnerable
	trixie	2.90-2	fixed
	sid	2.90-3	fixed
knot-resolver (PTS)	buster	3.2.1-3	vulnerable
	buster (security)	3.2.1-3+deb10u2	vulnerable
	bullseye	5.3.1-1+deb11u1	vulnerable
	bookworm	5.6.0-1	vulnerable
	bookworm (security)	5.6.0-1+deb12u1	fixed
	trixie	5.7.1-1	fixed
	sid	5.7.2-1	fixed
pdns-recursor (PTS)	buster, buster (security)	4.1.11-1+deb10u1	vulnerable
	bullseye	4.4.2-3	vulnerable
	bookworm	4.8.4-1	vulnerable
	bookworm (security)	4.8.8-1	fixed
	trixie	4.9.3-1	fixed
	sid	4.9.5-1	fixed
systemd (PTS)	buster	241-7~deb10u8	vulnerable
	buster (security)	241-7~deb10u10	vulnerable
	bullseye	247.3-7+deb11u4	vulnerable
	bookworm	252.22-1~deb12u1	vulnerable
	trixie	255.4-1	fixed
	sid	255.5-1	fixed
unbound (PTS)	buster	1.9.0-2+deb10u2	vulnerable
	buster (security)	1.9.0-2+deb10u4	fixed
	bullseye	1.13.1-1+deb11u1	vulnerable
	bullseye (security)	1.13.1-1+deb11u2	fixed
	bookworm	1.17.1-2+deb12u1	vulnerable
	bookworm (security)	1.17.1-2+deb12u2	fixed
	trixie	1.19.1-1	fixed
	sid	1.19.2-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
bind9	source	bullseye	1:9.16.48-1	DSA-5621-1
bind9	source	bookworm	1:9.18.24-1	DSA-5621-1
bind9	source	(unstable)	1:9.19.21-1
dnsmasq	source	(unstable)	2.90-1
knot-resolver	source	bookworm	5.6.0-1+deb12u1	DSA-5633-1
knot-resolver	source	(unstable)	5.7.1-1
pdns-recursor	source	bookworm	4.8.6-1	DSA-5626-1
pdns-recursor	source	(unstable)	4.9.3-1		1063852
systemd	source	(unstable)	255.4-1
unbound	source	buster	1.9.0-2+deb10u4	DLA-3736-1
unbound	source	bullseye	1.13.1-1+deb11u2	DSA-5620-1
unbound	source	bookworm	1.17.1-2+deb12u2	DSA-5620-1
unbound	source	(unstable)	1.19.1-1		1063845

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://downloads.isc.org/isc/bind9/9.16.48/patches/0005-CVE-2023-50387-CVE-2023-50868.patch
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