CVE-2023-42669

CVE Details

Release Date:	2023-10-10
Impact:	Moderate	What is this?

Description

A vulnerability was found in Samba's 'rpcecho' development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the 'rpcecho' service operates with only one worker in the main RPC task, allowing calls to the 'rpcecho' server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a 'sleep()' call in the 'dcesrv_echo_TestSleep()' function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the 'rpcecho' server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as 'rpcecho' runs in the main RPC task.

See more information about CVE-2023-42669 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:	6.5
Vector String:	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version:	3.0
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (samba)	ELSA-2023-7467	2023-11-23
Oracle Linux version 9 (samba)	ELSA-2023-6744	2023-11-16