| 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, DLA-3816-1, DLA-3859-1, DLA-3974-1, DSA-5620-1, DSA-5621-1, DSA-5626-1, DSA-5633-1 |
| Debian Bugs | 1063845, 1063852, 1077750 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| bind9 (PTS) | bullseye | 1:9.16.50-1~deb11u2 | fixed |
| bullseye (security) | 1:9.16.50-1~deb11u1 | fixed | |
| bookworm, bookworm (security) | 1:9.18.28-1~deb12u2 | fixed | |
| trixie | 1:9.20.4-2 | fixed | |
| sid | 1:9.20.4-3 | fixed | |
| dnsjava (PTS) | sid, bookworm, bullseye | 2.1.8-2 | vulnerable |
| dnsmasq (PTS) | bullseye | 2.85-1 | vulnerable |
| bullseye (security) | 2.85-1+deb11u1 | fixed | |
| bookworm | 2.89-1 | vulnerable | |
| sid, trixie | 2.90-7 | fixed | |
| knot-resolver (PTS) | bullseye | 5.3.1-1+deb11u1 | vulnerable |
| bookworm, bookworm (security) | 5.6.0-1+deb12u1 | fixed | |
| sid, trixie | 5.7.4-2 | fixed | |
| pdns-recursor (PTS) | bullseye | 4.4.2-3 | vulnerable |
| bookworm, bookworm (security) | 4.8.8-1 | fixed | |
| sid, trixie | 5.1.3-1 | fixed | |
| systemd (PTS) | bullseye | 247.3-7+deb11u5 | vulnerable |
| bullseye (security) | 247.3-7+deb11u6 | fixed | |
| bookworm | 252.31-1~deb12u1 | fixed | |
| trixie | 257-2 | fixed | |
| sid | 257.1-3 | fixed | |
| unbound (PTS) | bullseye | 1.13.1-1+deb11u2 | fixed |
| bullseye (security) | 1.13.1-1+deb11u4 | fixed | |
| bookworm, bookworm (security) | 1.17.1-2+deb12u2 | fixed | |
| sid, trixie | 1.22.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| bind9 | source | buster | 1:9.11.5.P4+dfsg-5.1+deb10u11 | DLA-3816-1 | ||
| 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 | |||
| dnsjava | source | (unstable) | (unfixed) | 1077750 | ||
| dnsmasq | source | bullseye | 2.85-1+deb11u1 | DLA-3974-1 | ||
| 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 | bullseye | (unfixed) | end-of-life | ||
| pdns-recursor | source | bookworm | 4.8.6-1 | DSA-5626-1 | ||
| pdns-recursor | source | (unstable) | 4.9.3-1 | 1063852 | ||
| systemd | source | bullseye | 247.3-7+deb11u6 | DLA-3859-1 | ||
| systemd | source | bookworm | 252.23-1~deb12u1 | |||
| 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 |
[bookworm] - dnsmasq <no-dsa> (Update proposed for next point release)
[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 <end-of-life> (No longer supported with security updates in Bullseye)
[buster] - systemd <no-dsa> (DNSSEC is disabled by default in systemd-resolved; can be fixed via point release)
[bookworm] - dnsjava <no-dsa> (Minor issue)
[bullseye] - dnsjava <no-dsa> (Minor issue)
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
Fixed by: https://github.com/PowerDNS/pdns/pull/13781
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
https://github.com/advisories/GHSA-crjg-w57m-rqqf
https://github.com/dnsjava/dnsjava/commit/07ac36a11578cc1bce0cd8ddf2fe568f062aee78 (v3.6.0)
https://github.com/dnsjava/dnsjava/commit/3ddc45ce8cdb5c2274e10b7401416f497694e1cf (v3.6.0)