as31 2.3.1-4 does not seed the random number generator and generates predictable temporary file names, which makes it easier for local users to create or truncate files via a symlink attack.
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 |
|---|---|---|---|
| As31 | Bdale_garbee | 2.3.1-4 (including) | 2.3.1-4 (including) |
| As31 | Ubuntu | lucid | * |
| As31 | Ubuntu | maverick | * |
| As31 | Ubuntu | natty | * |
| As31 | Ubuntu | oneiric | * |
| As31 | Ubuntu | precise | * |
| As31 | Ubuntu | upstream | * |
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://bugs.debian.org/cgi-bin/bugreport.cgi?bug=655496
- http://www.openwall.com/lists/oss-security/2012/01/24/11
- http://www.openwall.com/lists/oss-security/2012/01/24/7
- http://www.openwall.com/lists/oss-security/2012/07/05/1
- http://www.openwall.com/lists/oss-security/2012/07/06/3
- http://www.openwall.com/lists/oss-security/2012/08/31/9
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=655496
- http://www.openwall.com/lists/oss-security/2012/01/24/11
- http://www.openwall.com/lists/oss-security/2012/01/24/7
- http://www.openwall.com/lists/oss-security/2012/07/05/1
- http://www.openwall.com/lists/oss-security/2012/07/06/3
- http://www.openwall.com/lists/oss-security/2012/08/31/9