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. Broken commit info: Bugfix commit info: https://kb.isc.org/docs/cve-2023-50387 https://news.ycombinator.com/item?id=39367411 https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=3ae7f1ab0d847b17fdc95fd0e5b3120f66dc3af9 https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/ https://www.nlnetlabs.nl/downloads/unbound/patch_CVE-2023-50387_CVE-2023-50868.diff https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ https://access.redhat.com/security/cve/CVE-2023-50387 https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ http://www.openwall.com/lists/oss-security/2024/02/16/3 https://www.athene-center.de/aktuelles/key-trap https://www.isc.org/blogs/2024-bind-security-release/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 https://bugzilla.suse.com/show_bug.cgi?id=1219823 https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/ http://www.openwall.com/lists/oss-security/2024/02/16/2 https://news.ycombinator.com/item?id=39372384 https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/ https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387 https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf