Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://www.openwall.com/lists/oss-security/2024/02/16/2Issue Tracking, Mailing List
http://www.openwall.com/lists/oss-security/2024/02/16/3Issue Tracking, Mailing List
https://access.redhat.com/security/cve/CVE-2023-50868Vendor Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219826Issue Tracking
https://datatracker.ietf.org/doc/html/rfc5155Technical Description
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.htmlVendor Advisory
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1Release Notes
https://kb.isc.org/docs/cve-2023-50868Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.htmlMailing List, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.htmlMailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/Mailing List, Vendor Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.htmlMailing List, Release Notes
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/Release Notes
https://security.netapp.com/advisory/ntap-20240307-0008/Vendor Advisory
https://www.isc.org/blogs/2024-bind-security-release/Exploit, Mitigation, Press/Media Coverage
http://www.openwall.com/lists/oss-security/2024/02/16/2Issue Tracking, Mailing List
http://www.openwall.com/lists/oss-security/2024/02/16/3Issue Tracking, Mailing List
https://access.redhat.com/security/cve/CVE-2023-50868Vendor Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219826Issue Tracking
https://datatracker.ietf.org/doc/html/rfc5155Technical Description
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.htmlVendor Advisory
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1Release Notes
https://kb.isc.org/docs/cve-2023-50868Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.htmlMailing List, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.htmlMailing List, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00001.htmlMailing List, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/11/msg00035.htmlMailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/Mailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/Mailing List, Vendor Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.htmlMailing List, Release Notes
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/Release Notes
https://security.netapp.com/advisory/ntap-20240307-0008/Vendor Advisory
https://www.isc.org/blogs/2024-bind-security-release/Exploit, Mitigation, Press/Media Coverage

Timeline

Published: Feb 14, 2024
Last modified: Jun 17, 2026
NVD status: Analyzed