CVE-2023-42670Samba: 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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://access.redhat.com/security/cve/CVE-2023-42670 vdb-entryThird Party Advisory
• RHBZ#2241885 issue-trackingIssue 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/ZUMVALLFFDFC53…
• https://security.netapp.com/advisory/ntap-20231124-0002/