CVE-2014-5029

The web interface in CUPS 1.7.4 allows local users in the lp group to read arbitrary files via a symlink attack on a file in /var/cache/cups/rss/ and language[0] set to null. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-3537.

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://advisories.mageia.org/MGASA-2014-0313.html
• http://rhn.redhat.com/errata/RHSA-2014-1388.html
• http://secunia.com/advisories/60509
• http://secunia.com/advisories/60787
• http://www.debian.org/security/2014/dsa-2990
• http://www.mandriva.com/security/advisories?name=MDVSA-2015:108
• http://www.openwall.com/lists/oss-security/2014/07/22/13
• http://www.openwall.com/lists/oss-security/2014/07/22/2
• http://www.ubuntu.com/usn/USN-2341-1
• https://cups.org/str.php?L4455