CVE-2023-50868

critical

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.

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/

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/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/

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/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/

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/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/

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/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/

https://www.cisa.gov/news-events/ics-advisories/icsa-24-319-08

https://www.darkreading.com/vulnerabilities-threats/microsoft-late-dangerous-dnssec-zero-day-flaw

https://www.tenable.com/blog/microsofts-june-2024-patch-tuesday-addresses-49-cves

https://www.isc.org/blogs/2024-bind-security-release/

https://security.netapp.com/advisory/ntap-20240307-0008/

https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html

https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html

https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html

https://kb.isc.org/docs/cve-2023-50868

https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html

https://datatracker.ietf.org/doc/html/rfc5155

https://bugzilla.suse.com/show_bug.cgi?id=1219826

https://access.redhat.com/security/cve/CVE-2023-50868

http://www.openwall.com/lists/oss-security/2024/02/16/3

http://www.openwall.com/lists/oss-security/2024/02/16/2

Details

Source: Mitre, NVD

Published: 2024-02-14

Updated: 2024-06-10

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.60295