CVE-2023-50868

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.

Scores

Weaknesses (CWE)

• CWE-400

European references

• ENISA EUVD · EUVD-2023-55601
• GCVE · GCVE-0-2023-50868

CERT-FR advisories

• CERTFR-2026-AVI-0326 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
• CERTFR-2026-AVI-0316 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
• CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
• CERTFR-2025-AVI-0018 — Multiples vulnérabilités dans les produits Juniper Networks · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0713 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0627 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0506 — Multiples vulnérabilités dans Juniper Secure Analytics · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0486 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0470 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0385 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0122 — Multiples vulnérabilités dans Bind · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:netapp:hci_baseboard_management_controller:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
• cpe:2.3:o:netapp:bootstrap_os:-:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* < 4.8.5
• cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* ≥ 4.9.0 < 4.9.3
• cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* ≥ 5.0.0 < 5.0.2
• 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:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.0.0 < 9.16.48
• cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:* ≥ 9.9.3 < 9.16.48
• cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.18.0 < 9.18.24
• cpe:2.3:a:isc:bind:*:s1:*:*:supported_preview:*:*:* ≥ 9.18.11 < 9.18.24
• cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.19.0 < 9.19.21

Affected products

References

• https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
• https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
• https://www.isc.org/blogs/2024-bind-security-release/
• https://datatracker.ietf.org/doc/html/rfc5155
• https://kb.isc.org/docs/cve-2023-50868
• https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
• https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
• https://access.redhat.com/security/cve/CVE-2023-50868
• https://bugzilla.suse.com/show_bug.cgi?id=1219826
• http://www.openwall.com/lists/oss-security/2024/02/16/2
• http://www.openwall.com/lists/oss-security/2024/02/16/3
• 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/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
• https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
• 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/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
• 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/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
• 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/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
• https://security.netapp.com/advisory/ntap-20240307-0008/
• https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
• https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
• https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
• 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/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/

Sources