Samba: ad dc busy rpc multiple listener dos

Summary

CVE	CVE-2023-42670
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2023-11-03 08:15:07 UTC
Updated	2026-11-07 12:17:33 UTC
Description	A flaw was found in Samba. It is susceptible to a vulnerability where multiple incompatible RPC listeners can be initiated, causing disruptions in the AD DC service. When Samba's RPC server experiences a high load or unresponsiveness, servers intended for non-AD DC purposes (for example, NT4-emulation "classic DCs") can erroneously start and compete for the same unix domain sockets. This issue leads to partial query responses from the AD DC, causing issues such as "The procedure number is out of range" when using tools like Active Directory Users. This flaw allows an attacker to disrupt AD DC services.

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-400 | NVD-CWE-noinfo | CWE-400 Uncontrolled Resource Consumption

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	6.5	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`
3.1	[email protected]	Secondary	6.5	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`
3.1	CNA	CVSS	6.5	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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

Type	Vendor	Product	Version	Update	Edition	Language
Application	Samba	Samba	All	All	All	All

Source	Vendor	Product	Version	Platforms
CNA	Red Hat	Red Hat Enterprise Linux 6	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 6	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 7	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	Not specified	Not specified
CNA	Red Hat	Red Hat Storage 3	Not specified	Not specified

Reference	Source	Link	Tags
Samba - Security Announcement Archive	af854a3a-2127-422b-91ae-364da2661108	www.samba.org	Vendor Advisory
15473 – (CVE-2023-42670) [SECURITY] CVE-2023-42670 The procedure number is out of range when starting Active Directory Users and Computers	af854a3a-2127-422b-91ae-364da2661108	bugzilla.samba.org	Issue Tracking
security.netapp.com/advisory/ntap-20231124-0002	af854a3a-2127-422b-91ae-364da2661108	security.netapp.com
[SECURITY] Fedora 39 Update: samba-4.19.2-1.fc39 - package-announce - Fedora Mailing-Lists	af854a3a-2127-422b-91ae-364da2661108	lists.fedoraproject.org
2241885 – (CVE-2023-42670) CVE-2023-42670 samba: AD DC Busy RPC multiple listener DoS	af854a3a-2127-422b-91ae-364da2661108	bugzilla.redhat.com	Issue Tracking
cve-details	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Source	Time	Event
CNA	2023-10-03T00:00:00.000Z	Reported to Red Hat.
CNA	2023-10-10T00:00:00.000Z	Made public.

199820 Ubuntu Security Notification for Samba Vulnerabilities (USN-6425-1)
199907 Ubuntu Security Notification for Samba Vulnerabilities (USN-6425-3)
284612 Fedora Security Update for samba (FEDORA-2023-7eb8cbf1a5)
284682 Fedora Security Update for samba (FEDORA-2023-fff0c857d6)
285191 Fedora Security Update for samba (FEDORA-2023-8c9251e479)
503395 Alpine Linux Security Update for samba
505937 Alpine Linux Security Update for samba
6000310 Debian Security Update for samba (DSA 5525-1)
710873 Gentoo Linux Samba Multiple Vulnerabilities (GLSA 202402-28)
755069 SUSE Enterprise Linux Security Update for samba (SUSE-SU-2023:4046-1)