CVE-2014-0243

Check_MK through 1.2.5i2p1 allows local users to read arbitrary files via a symlink attack to a file in /var/lib/check_mk_agent/job.

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://git.mathias-kettner.de/git/?p=check_mk.git%3Ba=commit%3Bh=0426323df1641596c4f01ef5a716a3b65276f01c
• http://git.mathias-kettner.de/git/?p=check_mk.git%3Ba=commit%3Bh=a2ef8d00c53ec9cbd05c4ae2f09b50761130e7ce
• http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134160.html
• http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134166.html
• http://packetstormsecurity.com/files/126857/Check_MK-Arbitrary-File-Disclosure.html
• http://seclists.org/fulldisclosure/2014/May/145
• http://www.openwall.com/lists/oss-security/2014/05/28/1
• http://www.securityfocus.com/bid/67674
• https://bugzilla.redhat.com/show_bug.cgi?id=1101669
• https://secuniaresearch.flexerasoftware.com/advisories/58536
• https://www.securityfocus.com/archive/1/532224/100/0/threaded