Postfix before 2.3.15, 2.4 before 2.4.8, 2.5 before 2.5.4, and 2.6 before 2.6-20080814, when the operating system supports hard links to symlinks, allows local users to append e-mail messages to a file to which a root-owned symlink points, by creating a hard link to this symlink and then sending a message. NOTE: this can be leveraged to gain privileges if there is a symlink to an init script.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Postfix | Postfix | 2.3.0 (including) | 2.3.0 (including) |
| Postfix | Postfix | 2.3.1 (including) | 2.3.1 (including) |
| Postfix | Postfix | 2.3.2 (including) | 2.3.2 (including) |
| Postfix | Postfix | 2.3.3 (including) | 2.3.3 (including) |
| Postfix | Postfix | 2.3.4 (including) | 2.3.4 (including) |
| Postfix | Postfix | 2.3.5 (including) | 2.3.5 (including) |
| Postfix | Postfix | 2.3.6 (including) | 2.3.6 (including) |
| Postfix | Postfix | 2.3.7 (including) | 2.3.7 (including) |
| Postfix | Postfix | 2.3.8 (including) | 2.3.8 (including) |
| Postfix | Postfix | 2.3.9 (including) | 2.3.9 (including) |
| Postfix | Postfix | 2.3.10 (including) | 2.3.10 (including) |
| Postfix | Postfix | 2.3.11 (including) | 2.3.11 (including) |
| Postfix | Postfix | 2.3.12 (including) | 2.3.12 (including) |
| Postfix | Postfix | 2.3.13 (including) | 2.3.13 (including) |
| Postfix | Postfix | 2.3.14 (including) | 2.3.14 (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 | 2.5.0 (including) | 2.5.0 (including) |
| Postfix | Postfix | 2.5.1 (including) | 2.5.1 (including) |
| Postfix | Postfix | 2.5.2 (including) | 2.5.2 (including) |
| Postfix | Postfix | 2.5.3 (including) | 2.5.3 (including) |
| Postfix | Postfix | 2.6.0 (including) | 2.6.0 (including) |