CVE-2012-0808

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

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