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CVE-2023-42669— Samba: "rpcecho" development server allows denial of service via sleep() call on ad dc

Quick assessment

Affected

Red Hat Red Hat Enterprise Linux 8

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Samba是用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba 存在安全漏洞，该漏洞源于rpcecho开发服务器存在安全漏洞。允许攻击者通过调用AD DC上的sleep（）造成拒绝服务（DOS）。

CVSS 6.5 · Medium EPSS 1.94% · P80 Updated Feb 26, 2026

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

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I. Basic Information for CVE-2023-42669

Vulnerability Information

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Vulnerability Title

Samba: "rpcecho" development server allows denial of service via sleep() call on ad dc

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Vulnerability Title

Samba 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Enterprise Linux 8	0:4.18.6-2.el8_9 ~ *	`cpe:/o:redhat:enterprise_linux:8::baseos`
Red Hat	Red Hat Enterprise Linux 8	0:4.18.6-2.el8_9 ~ *	`cpe:/o:redhat:enterprise_linux:8::baseos`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support	0:4.15.5-13.el8_6 ~ *	`cpe:/a:redhat:rhel_eus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Extended Update Support	0:4.17.5-4.el8_8 ~ *	`cpe:/a:redhat:rhel_eus:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:4.18.6-101.el9_3 ~ *	`cpe:/o:redhat:enterprise_linux:9::baseos`
Red Hat	Red Hat Enterprise Linux 9	0:4.18.6-101.el9_3 ~ *	`cpe:/o:redhat:enterprise_linux:9::baseos`
Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	0:4.15.5-111.el9_0 ~ *	`cpe:/a:redhat:rhel_eus:9.0::appstream`
Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	0:4.17.5-104.el9_2 ~ *	`cpe:/a:redhat:rhel_eus:9.2::crb`
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8	0:4.15.5-13.el8_6 ~ *	`cpe:/a:redhat:rhel_eus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 6	-	`cpe:/o:redhat:enterprise_linux:6`
Red Hat	Red Hat Enterprise Linux 6	-	`cpe:/o:redhat:enterprise_linux:6`
Red Hat	Red Hat Enterprise Linux 7	-	`cpe:/o:redhat:enterprise_linux:7`
Red Hat	Red Hat Storage 3	-	`cpe:/a:redhat:storage:3`

II. Public POCs for CVE-2023-42669

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2023-42669

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Vendor Advisories for CVE-2023-42669 (8)

https://access.redhat.com/security/cve/CVE-2023-42669 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2241884 issue-tracking x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7464 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:6209 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7371 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7467 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7408 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:6744 vendor-advisory x_refsource_REDHAT

Other References for CVE-2023-42669 (2)

https://www.cve.org/CVERecord?id=CVE-2023-42669

IV. Related Vulnerabilities

Same weakness: CWE-400