CVE-2023-42670

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.

How to fix CVE-2023-42670

To remediate CVE-2023-42670, upgrade the affected package to a fixed version below.

• —upgrade to 4.18.8-r0 or later
• —upgrade to 2:4.17.12+dfsg-0+deb12u1 or later

Is CVE-2023-42670 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 4.18.8-r0
• from 0, < 2:4.17.12+dfsg-0+deb12u1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2023-42670
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2023-42670