CVE-2023-4154: Samba

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A design flaw was found in Samba's DirSync control implementation, which exposes passwords and secrets in Active Directory to privileged users and Read-Only Domain Controllers (RODCs). This flaw allows RODCs and users possessing the GET_CHANGES right to access all attributes, including sensitive secrets and passwords. Even in a default setup, RODC DC accounts, which should only replicate some passwords, can gain access to all domain secrets, including the vital krbtgt, effectively eliminating the RODC / DC distinction. Furthermore, the vulnerability fails to account for error conditions (fail open), like out-of-memory situations, potentially granting access to secret attributes, even under low-privileged attacker influence.

Affected products

• Samba Samba: from 4.0.0, before 4.17.12 (fixed in 4.17.12); from 4.18.0, before 4.18.8 (fixed in 4.18.8); from 4.19.0, before 4.19.1 (fixed in 4.19.1)

Published 2023-11-07. Last modified 2026-06-17.