CVE-2012-2103

The qmailscan plugin for Munin 1.4.5 allows local users to overwrite arbitrary files via a symlink attack on temporary files with predictable names.

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=668778
• http://secunia.com/advisories/48859
• http://secunia.com/advisories/51218
• http://www.openwall.com/lists/oss-security/2012/04/16/5
• http://www.openwall.com/lists/oss-security/2012/04/16/6
• http://www.securityfocus.com/bid/53031
• http://www.ubuntu.com/usn/USN-1622-1
• https://bugzilla.redhat.com/show_bug.cgi?id=812889
• https://exchange.xforce.ibmcloud.com/vulnerabilities/74884