CVE-2023-50868
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.
- Score
- CVSS 3.1 7.5 High
- Status
- Analyzed - cve@mitre.org
- Published
- 2024-02-14
- Last modified
- 2025-11-04
- Weaknesses
- CWE-400
Affected products
- Debian Linux (Debian)
- Fedora (Fedoraproject)
- Bind (Isc)
- Active Iq Unified Manager (Netapp)
- Bootstrap Os (Netapp)
- Hci Baseboard Management Controller (Netapp)
- Recursor (Powerdns)
- Enterprise Linux (Redhat)
References
- http://www.openwall.com/lists/oss-security/2024/02/16/2
- http://www.openwall.com/lists/oss-security/2024/02/16/3
- https://access.redhat.com/security/cve/CVE-2023-50868
- https://bugzilla.suse.com/show_bug.cgi?id=1219826
- https://datatracker.ietf.org/doc/html/rfc5155
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
- https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
- https://kb.isc.org/docs/cve-2023-50868
- https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
- https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIV…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YP…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHC…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJ…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENW…
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
- https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
- https://security.netapp.com/advisory/ntap-20240307-0008/
- https://www.isc.org/blogs/2024-bind-security-release/
- https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
- https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP…
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7…
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB…
