UnRAR before 6.2.3 allows extraction of files outside of the destination folder via symlink chains.
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 |
| Unrar |
Rarlab |
* |
6.2.3 (excluding) |
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.
References