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CVE-2023-42669

6.5 · MEDIUM

A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements.

Published Nov 6, 2023CWE-400EPSS 1.94%

Overview

CVE-2023-42669 is a medium-severity vulnerability. It was published on November 6, 2023 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2023:6209Refaccess.redhat.com/errata/RHSA-2023:6744Refaccess.redhat.com/errata/RHSA-2023:7371Refaccess.redhat.com/errata/RHSA-2023:7408Refaccess.redhat.com/errata/RHSA-2023:7464Refaccess.redhat.com/errata/RHSA-2023:7467Refaccess.redhat.com/security/cve/CVE-2023-42669Refbugzilla.redhat.com/show_bug.cgi?id=2241884Refbugzilla.samba.org/show_bug.cgi?id=15474Refwww.samba.org/samba/security/CVE-2023-42669.html

How CyberStrike helps

Frequently asked questions

What is CVE-2023-42669?

CVE-2023-42669 is a medium-severity vulnerability. It was published on November 6, 2023 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2023-42669?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-42669?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-42669?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-42669 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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