CVE-2023-42670

Samba: ad dc busy rpc multiple listener dos

CVSS 6.5 MEDIUMEPSS 1.1%CWE-400

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.5EPSS 1.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

03 Nov 2023Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

sambaRed 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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References

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