fwd_check.sh in libncbi6 6.1.20080302 allows local users to overwrite arbitrary files via a symlink attack on a /tmp/##### temporary file.
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 |
|---|---|---|---|
| Libncbi6 | Aucko | 6.1.20080302 (including) | 6.1.20080302 (including) |
| Ncbi-tools6 | Ubuntu | dapper | * |
| Ncbi-tools6 | Ubuntu | gutsy | * |
| Ncbi-tools6 | Ubuntu | hardy | * |
| Ncbi-tools6 | Ubuntu | intrepid | * |
| Ncbi-tools6 | Ubuntu | jaunty | * |
| Ncbi-tools6 | Ubuntu | karmic | * |
| Ncbi-tools6 | Ubuntu | lucid | * |
| Ncbi-tools6 | Ubuntu | maverick | * |
| Ncbi-tools6 | Ubuntu | natty | * |
| Ncbi-tools6 | Ubuntu | oneiric | * |
| Ncbi-tools6 | Ubuntu | quantal | * |
| Ncbi-tools6 | Ubuntu | raring | * |
| Ncbi-tools6 | Ubuntu | saucy | * |
| Ncbi-tools6 | Ubuntu | upstream | * |
| Ncbi-tools6 | Ubuntu | utopic | * |
| Ncbi-tools6 | Ubuntu | vivid | * |
| Ncbi-tools6 | Ubuntu | wily | * |
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