The STARTTLS implementation in Postfix 2.4.x before 2.4.16, 2.5.x before 2.5.12, 2.6.x before 2.6.9, and 2.7.x before 2.7.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a plaintext command injection attack.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Postfix | Postfix | 2.4 (including) | 2.4 (including) |
| Postfix | Postfix | 2.4.0 (including) | 2.4.0 (including) |
| Postfix | Postfix | 2.4.1 (including) | 2.4.1 (including) |
| Postfix | Postfix | 2.4.2 (including) | 2.4.2 (including) |
| Postfix | Postfix | 2.4.3 (including) | 2.4.3 (including) |
| Postfix | Postfix | 2.4.4 (including) | 2.4.4 (including) |
| Postfix | Postfix | 2.4.5 (including) | 2.4.5 (including) |
| Postfix | Postfix | 2.4.6 (including) | 2.4.6 (including) |
| Postfix | Postfix | 2.4.7 (including) | 2.4.7 (including) |
| Postfix | Postfix | 2.4.8 (including) | 2.4.8 (including) |
| Postfix | Postfix | 2.4.9 (including) | 2.4.9 (including) |
| Postfix | Postfix | 2.4.10 (including) | 2.4.10 (including) |
| Postfix | Postfix | 2.4.11 (including) | 2.4.11 (including) |
| Postfix | Postfix | 2.4.12 (including) | 2.4.12 (including) |
| Postfix | Postfix | 2.4.13 (including) | 2.4.13 (including) |
| Postfix | Postfix | 2.4.14 (including) | 2.4.14 (including) |
| Postfix | Postfix | 2.4.15 (including) | 2.4.15 (including) |