CVE-2023-50868
Severity CVSS v4.0:
Pending analysis
Type:
CWE-400
Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
14/02/2024
Last modified:
23/12/2025
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.
Impact
Base Score 3.x
7.50
Severity 3.x
HIGH
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* | 9.0.0 (including) | 9.16.48 (excluding) |
| cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:* | 9.9.3 (including) | 9.16.48 (excluding) |
| cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* | 9.18.0 (including) | 9.18.24 (excluding) |
| cpe:2.3:a:isc:bind:*:s1:*:*:supported_preview:*:*:* | 9.18.11 (including) | 9.18.24 (excluding) |
| cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* | 9.19.0 (including) | 9.19.21 (excluding) |
| cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* | ||
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | ||
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | ||
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | ||
| cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* | ||
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | ||
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | ||
| cpe:2.3:o:redhat:enterprise_linux:8.2:*:*:*:*:*:*:* | ||
| cpe:2.3:o:redhat:enterprise_linux:8.4:*:*:*:*:*:*:* | ||
| cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* | 4.8.5 (excluding) |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- 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/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
- 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/
- 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.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%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
- 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/