modules.d/90crypt/module-setup.sh in the dracut package before 037-17.30.1 in openSUSE 13.2 allows local users to have unspecified impact via a symlink attack on /tmp/dracut_block_uuid.map.
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 |
|---|---|---|---|
| Dracut | Dracut_project | * | 037-17.30.1 (excluding) |
| Dracut | Ubuntu | artful | * |
| Dracut | Ubuntu | precise | * |
| Dracut | Ubuntu | vivid | * |
| Dracut | Ubuntu | wily | * |
| Dracut | Ubuntu | yakkety | * |
| Dracut | Ubuntu | zesty | * |
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
References
- http://lists.opensuse.org/opensuse-bugs/2015-06/msg02580.html
- http://lists.opensuse.org/opensuse-bugs/2015-06/msg02585.html
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00098.html
- http://lists.opensuse.org/opensuse-bugs/2015-06/msg02580.html
- http://lists.opensuse.org/opensuse-bugs/2015-06/msg02585.html
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00098.html