CVE-2023-50868

HIGH

ISC Bind < 9.16.48 - Denial of Service

Title source: rule

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.

Exploits (1)

nomisec WORKING POC 6 stars

by Goethe-Universitat-Cybersecurity · poc

https://github.com/Goethe-Universitat-Cybersecurity/NSEC3-Encloser-Attack

View Code ZIP pw:eip

References (29)

[Technical Description] https://datatracker.ietf.org/doc/html/rfc5155

[Issue Tracking, Mailing List] http://www.openwall.com/lists/oss-security/2024/02/16/2

[Issue Tracking, Mailing List] http://www.openwall.com/lists/oss-security/2024/02/16/3

[Vendor Advisory] https://access.redhat.com/security/cve/CVE-2023-50868

[Issue Tracking] https://bugzilla.suse.com/show_bug.cgi?id=1219826

[Vendor Advisory] https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html

[Release Notes] https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1

[Third Party Advisory] https://kb.isc.org/docs/cve-2023-50868

[Vendor Advisory, Mailing List] https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html

[Vendor Advisory, Mailing List] https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/

[Vendor Advisory, Mailing List] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/

... and 9 more

Scores

CVSS v3 7.5

EPSS 0.1180

EPSS Percentile 93.6%

Attack Vector NETWORK

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

Classification

CWE

CWE-400

Status published

Affected Products (16)

isc/bind < 9.16.48

isc/bind < 9.16.48

isc/bind < 9.18.24

fedoraproject/fedora

fedoraproject/fedora

debian/debian_linux

debian/debian_linux

redhat/enterprise_linux

redhat/enterprise_linux

redhat/enterprise_linux

redhat/enterprise_linux

redhat/enterprise_linux

powerdns/recursor < 4.8.5

netapp/bootstrap_os

netapp/active_iq_unified_manager

... and 1 more

Timeline

Published Feb 14, 2024

Tracked Since Feb 18, 2026