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 | 2.5.0 | 2.5.0 |
| Postfix | Postfix | 2.3.11 | 2.3.11 |
| Postfix | Postfix | 2.3.6 | 2.3.6 |
| Postfix | Postfix | 2.3.0 | 2.3.0 |
| Postfix | Postfix | 2.5.2 | 2.5.2 |
| Postfix | Postfix | 2.4.0 | 2.4.0 |
| Postfix | Postfix | 2.3.12 | 2.3.12 |
| Postfix | Postfix | 2.3.10 | 2.3.10 |
| Postfix | Postfix | 2.4.5 | 2.4.5 |
| Postfix | Postfix | 2.3.9 | 2.3.9 |
| Postfix | Postfix | 2.3.2 | 2.3.2 |
| Postfix | Postfix | 2.3.7 | 2.3.7 |
| Postfix | Postfix | 2.3.14 | 2.3.14 |
| Postfix | Postfix | 2.4.3 | 2.4.3 |
| Postfix | Postfix | 2.5.3 | 2.5.3 |
| Postfix | Postfix | 2.6.0 | 2.6.0 |
| Postfix | Postfix | 2.4.7 | 2.4.7 |
| Postfix | Postfix | 2.4.2 | 2.4.2 |
| Postfix | Postfix | 2.3.4 | 2.3.4 |
| Postfix | Postfix | 2.3.3 | 2.3.3 |
| Postfix | Postfix | 2.3.1 | 2.3.1 |
| Postfix | Postfix | 2.5.1 | 2.5.1 |
| Postfix | Postfix | 2.3.8 | 2.3.8 |
| Postfix | Postfix | 2.3.5 | 2.3.5 |
| Postfix | Postfix | 2.4.1 | 2.4.1 |
| Postfix | Postfix | 2.4.6 | 2.4.6 |
| Postfix | Postfix | 2.4.4 | 2.4.4 |
| Postfix | Postfix | 2.3.13 | 2.3.13 |
| Postfix | Ubuntu | dapper | * |
| Postfix | Ubuntu | feisty | * |
| Postfix | Ubuntu | gutsy | * |
| Postfix | Ubuntu | hardy | * |
| Postfix | Ubuntu | upstream | * |