fetchmailconf in fetchmail before 5.7.4 allows local users to overwrite files of other users via a symlink attack on temporary files.
Weakness
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Fetchmail | Fetchmail | * | 5.7.2 (including) |
| Fetchmail | Fetchmail | 4.5.1 (including) | 4.5.1 (including) |
| Fetchmail | Fetchmail | 4.5.2 (including) | 4.5.2 (including) |
| Fetchmail | Fetchmail | 4.5.3 (including) | 4.5.3 (including) |
| Fetchmail | Fetchmail | 4.5.4 (including) | 4.5.4 (including) |
| Fetchmail | Fetchmail | 4.5.5 (including) | 4.5.5 (including) |
| Fetchmail | Fetchmail | 4.5.6 (including) | 4.5.6 (including) |
| Fetchmail | Fetchmail | 4.5.7 (including) | 4.5.7 (including) |
| Fetchmail | Fetchmail | 4.5.8 (including) | 4.5.8 (including) |
| Fetchmail | Fetchmail | 4.6.0 (including) | 4.6.0 (including) |
| Fetchmail | Fetchmail | 4.6.1 (including) | 4.6.1 (including) |
| Fetchmail | Fetchmail | 4.6.2 (including) | 4.6.2 (including) |
| Fetchmail | Fetchmail | 4.6.3 (including) | 4.6.3 (including) |
| Fetchmail | Fetchmail | 4.6.4 (including) | 4.6.4 (including) |
| Fetchmail | Fetchmail | 4.6.5 (including) | 4.6.5 (including) |
| Fetchmail | Fetchmail | 4.6.6 (including) | 4.6.6 (including) |
| Fetchmail | Fetchmail | 4.6.7 (including) | 4.6.7 (including) |
| Fetchmail | Fetchmail | 4.6.8 (including) | 4.6.8 (including) |
| Fetchmail | Fetchmail | 4.6.9 (including) | 4.6.9 (including) |
| Fetchmail | Fetchmail | 4.7.0 (including) | 4.7.0 (including) |
| Fetchmail | Fetchmail | 4.7.1 (including) | 4.7.1 (including) |
| Fetchmail | Fetchmail | 4.7.2 (including) | 4.7.2 (including) |
| Fetchmail | Fetchmail | 4.7.3 (including) | 4.7.3 (including) |
| Fetchmail | Fetchmail | 4.7.4 (including) | 4.7.4 (including) |
| Fetchmail | Fetchmail | 4.7.5 (including) | 4.7.5 (including) |
| Fetchmail | Fetchmail | 4.7.6 (including) | 4.7.6 (including) |
| Fetchmail | Fetchmail | 4.7.7 (including) | 4.7.7 (including) |
| Fetchmail | Fetchmail | 5.0.0 (including) | 5.0.0 (including) |
| Fetchmail | Fetchmail | 5.0.1 (including) | 5.0.1 (including) |
| Fetchmail | Fetchmail | 5.0.2 (including) | 5.0.2 (including) |
| Fetchmail | Fetchmail | 5.0.3 (including) | 5.0.3 (including) |
| Fetchmail | Fetchmail | 5.0.4 (including) | 5.0.4 (including) |
| Fetchmail | Fetchmail | 5.0.5 (including) | 5.0.5 (including) |
| Fetchmail | Fetchmail | 5.0.6 (including) | 5.0.6 (including) |
| Fetchmail | Fetchmail | 5.0.7 (including) | 5.0.7 (including) |
| Fetchmail | Fetchmail | 5.0.8 (including) | 5.0.8 (including) |
| Fetchmail | Fetchmail | 5.1.0 (including) | 5.1.0 (including) |
| Fetchmail | Fetchmail | 5.1.4 (including) | 5.1.4 (including) |
| Fetchmail | Fetchmail | 5.2.0 (including) | 5.2.0 (including) |
| Fetchmail | Fetchmail | 5.2.1 (including) | 5.2.1 (including) |
| Fetchmail | Fetchmail | 5.2.3 (including) | 5.2.3 (including) |
| Fetchmail | Fetchmail | 5.2.4 (including) | 5.2.4 (including) |
| Fetchmail | Fetchmail | 5.2.7 (including) | 5.2.7 (including) |
| Fetchmail | Fetchmail | 5.2.8 (including) | 5.2.8 (including) |
| Fetchmail | Fetchmail | 5.3.0 (including) | 5.3.0 (including) |
| Fetchmail | Fetchmail | 5.3.1 (including) | 5.3.1 (including) |
| Fetchmail | Fetchmail | 5.3.3 (including) | 5.3.3 (including) |
| Fetchmail | Fetchmail | 5.3.8 (including) | 5.3.8 (including) |
| Fetchmail | Fetchmail | 5.4.0 (including) | 5.4.0 (including) |
| Fetchmail | Fetchmail | 5.4.3 (including) | 5.4.3 (including) |
| Fetchmail | Fetchmail | 5.4.4 (including) | 5.4.4 (including) |
| Fetchmail | Fetchmail | 5.4.5 (including) | 5.4.5 (including) |
| Fetchmail | Fetchmail | 5.5.0 (including) | 5.5.0 (including) |
| Fetchmail | Fetchmail | 5.5.2 (including) | 5.5.2 (including) |
| Fetchmail | Fetchmail | 5.5.3 (including) | 5.5.3 (including) |
| Fetchmail | Fetchmail | 5.5.5 (including) | 5.5.5 (including) |
| Fetchmail | Fetchmail | 5.5.6 (including) | 5.5.6 (including) |
| Fetchmail | Fetchmail | 5.6.0 (including) | 5.6.0 (including) |
| Fetchmail | Fetchmail | 5.7.0 (including) | 5.7.0 (including) |
| Red Hat Linux 5.2 | RedHat | * | |
| Red Hat Linux 6.2 | RedHat | * | |
| Red Hat Linux 7.0 | RedHat | * | |
| Red Hat Linux 7.1 | RedHat | * |
Potential Mitigations
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/132.html
- https://cwe.mitre.org/data/definitions/17.html
- https://cwe.mitre.org/data/definitions/35.html
- https://cwe.mitre.org/data/definitions/76.html