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.
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.19 | samba | 4.10.2-r0, 0, 3.2.10-r0 |
| Alpine:v3.23 | samba | 3.4.5-r0, 4.8.8-r0, 4.8.7-r0 |
| Alpine:v3.21 | samba | 3.6.4-r1, 0, 3.2.10-r0 |
| Alpine:v3.20 | samba | 4.8.8-r0, 4.8.7-r0, 4.8.5-r0 |
| Alpine:v3.22 | samba | 4.4.3-r0, 3.2.10-r0, 3.2.11-r0 |
| Alpine:v3.18 | samba | 4.8.8-r0, 3.2.10-r0, 3.2.11-r0 |