CVE-2023-42670

Samba: ad dc busy rpc multiple listener dos

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.49%
Vendor Advisory samba.org
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Storage 3
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/security/cve/CVE-2023-42670 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2241885 issue tracking
https://bugzilla.samba.org/show_bug.cgi?id=15473 issue tracking
https://www.samba.org/samba/security/CVE-2023-42670.html vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I/
https://security.netapp.com/advisory/ntap-20231124-0002/

Frequently Asked Questions

What is the severity of CVE-2023-42670?
CVE-2023-42670 has been scored as a medium severity vulnerability.
How to fix CVE-2023-42670?
To fix CVE-2023-42670, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-42670 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-42670 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-42670?
CVE-2023-42670 affects Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Storage 3.
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