A flaw was found in Samba, all versions starting samba 4.5.0 before samba 4.9.15, samba 4.10.10, samba 4.11.2, in the way it handles a user password change or a new password for a samba user. The Samba Active Directory Domain Controller can be configured to use a custom script to check for password complexity. This configuration can fail to verify password complexity when non-ASCII characters are used in the password, which could lead to weak passwords being set for samba users, making it vulnerable to dictionary attacks.
The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Samba | Samba | 4.5.0 (including) | 4.9.15 (excluding) |
| Samba | Samba | 4.10.0 (including) | 4.10.10 (excluding) |
| Samba | Samba | 4.11.0 (including) | 4.11.2 (excluding) |
| Samba | Ubuntu | bionic | * |
| Samba | Ubuntu | disco | * |
| Samba | Ubuntu | eoan | * |
| Samba | Ubuntu | trusty | * |
| Samba | Ubuntu | upstream | * |