CVE-2008-4943

bulmages-servers 0.11.1 allows local users to overwrite arbitrary files via a symlink attack on the (a) /tmp/error.txt, (b) /tmp/errores.txt, and possibly other temporary files, related to the (1) creabulmafact, (2) creabulmacont, and possibly (3) actualizabulmacont, (4) installbulmages-db, and (5) actualizabulmafact scripts.

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/496382
• http://dev.gentoo.org/~rbu/security/debiantemp/bulmages-servers
• http://www.openwall.com/lists/oss-security/2008/10/30/2
• https://bugs.gentoo.org/show_bug.cgi?id=235770