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.

Scores

Weaknesses (CWE)

• CWE-400

European references

• ENISA EUVD · EUVD-2023-47102
• GCVE · GCVE-0-2023-42670

CERT-FR advisories

• CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
• CERTFR-2024-AVI-0423 — Multiples vulnérabilités dans les produits NetApp · cert.ssi.gouv.fr
• CERTFR-2023-AVI-1011 — Multiples vulnérabilités dans les produits Qnap · cert.ssi.gouv.fr
• CERTFR-2023-AVI-0831 — Multiples vulnérabilités dans Samba · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* < 4.17.12
• cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* ≥ 4.18.0 < 4.18.8
• cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* ≥ 4.19.0 < 4.19.1
• cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*

Affected products

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://www.samba.org/samba/security/CVE-2023-42670.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I/
• https://security.netapp.com/advisory/ntap-20231124-0002/

Sources