{"id":"UBUNTU-CVE-2023-50868","details":"The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the \"NSEC3\" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.","modified":"2026-01-30T02:40:01.962108Z","published":"2024-02-13T00:00:00Z","related":["USN-6633-1","USN-6642-1","USN-6657-1","USN-6657-2","USN-6665-1","USN-6723-1"],"upstream":["CVE-2023-50868"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-50868"},{"type":"REPORT","url":"https://kb.isc.org/docs/cve-2023-50868"},{"type":"REPORT","url":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html"},{"type":"REPORT","url":"https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html"},{"type":"REPORT","url":"https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released"},{"type":"REPORT","url":"https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/"},{"type":"REPORT","url":"https://nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6633-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6642-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6657-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6665-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6723-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-50868"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6657-2"}],"affected":[{"package":{"name":"bind9","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/bind9@1:9.9.5.dfsg-3ubuntu0.19+esm12?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.9.5.dfsg-3ubuntu0.19+esm12"}]}],"versions":["1:9.9.3.dfsg.P2-4ubuntu1","1:9.9.3.dfsg.P2-4ubuntu2","1:9.9.3.dfsg.P2-4ubuntu3","1:9.9.5.dfsg-2","1:9.9.5.dfsg-3","1:9.9.5.dfsg-3ubuntu0.1","1:9.9.5.dfsg-3ubuntu0.2","1:9.9.5.dfsg-3ubuntu0.3","1:9.9.5.dfsg-3ubuntu0.4","1:9.9.5.dfsg-3ubuntu0.5","1:9.9.5.dfsg-3ubuntu0.6","1:9.9.5.dfsg-3ubuntu0.7","1:9.9.5.dfsg-3ubuntu0.8","1:9.9.5.dfsg-3ubuntu0.9","1:9.9.5.dfsg-3ubuntu0.10","1:9.9.5.dfsg-3ubuntu0.11","1:9.9.5.dfsg-3ubuntu0.12","1:9.9.5.dfsg-3ubuntu0.13","1:9.9.5.dfsg-3ubuntu0.14","1:9.9.5.dfsg-3ubuntu0.15","1:9.9.5.dfsg-3ubuntu0.16","1:9.9.5.dfsg-3ubuntu0.17","1:9.9.5.dfsg-3ubuntu0.18","1:9.9.5.dfsg-3ubuntu0.19","1:9.9.5.dfsg-3ubuntu0.19+esm1","1:9.9.5.dfsg-3ubuntu0.19+esm2","1:9.9.5.dfsg-3ubuntu0.19+esm3","1:9.9.5.dfsg-3ubuntu0.19+esm4","1:9.9.5.dfsg-3ubuntu0.19+esm5","1:9.9.5.dfsg-3ubuntu0.19+esm6","1:9.9.5.dfsg-3ubuntu0.19+esm7","1:9.9.5.dfsg-3ubuntu0.19+esm9","1:9.9.5.dfsg-3ubuntu0.19+esm10","1:9.9.5.dfsg-3ubuntu0.19+esm11"],"ecosystem_specific":{"binaries":[{"binary_name":"bind9","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"bind9-host","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"bind9utils","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"dnsutils","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"host","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"libbind-dev","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"libbind9-90","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"libdns100","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"libisc95","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"libisccc90","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"libisccfg90","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"liblwres90","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"},{"binary_name":"lwresd","binary_version":"1:9.9.5.dfsg-3ubuntu0.19+esm12"}],"availability":"Available 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