CVE-2023-50868

CVE Details

Release Date:	2024-02-13
Impact:	Important	What is this?

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.

See more information about CVE-2023-50868 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.5
Vector String:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (bind)	ELSA-2024-3741	2024-06-10
Oracle Linux version 7 (bind-dyndb-ldap)	ELSA-2024-3741	2024-06-10
Oracle Linux version 7 (dhcp)	ELSA-2024-3741	2024-06-10
Oracle Linux version 7 (unbound)	ELSA-2024-11003	2025-01-27
Oracle Linux version 8 (bind)	ELSA-2024-1782	2024-04-11
Oracle Linux version 8 (bind)	ELSA-2024-3271	2024-05-29
Oracle Linux version 8 (bind9.16)	ELSA-2024-1781	2024-04-11
Oracle Linux version 8 (dhcp)	ELSA-2024-1782	2024-04-11
Oracle Linux version 8 (dhcp)	ELSA-2024-3271	2024-05-29
Oracle Linux version 8 (dnsmasq)	ELSA-2024-1335	2024-03-15
Oracle Linux version 8 (unbound)	ELSA-2024-0965	2024-02-28
Oracle Linux version 9 (bind)	ELSA-2024-1789	2024-04-11
Oracle Linux version 9 (bind)	ELSA-2024-2551	2024-05-07
Oracle Linux version 9 (bind-dyndb-ldap)	ELSA-2024-1789	2024-04-11
Oracle Linux version 9 (bind-dyndb-ldap)	ELSA-2024-2551	2024-05-07
Oracle Linux version 9 (dnsmasq)	ELSA-2024-1334	2024-03-15
Oracle Linux version 9 (unbound)	ELSA-2024-0977	2024-02-28