CVE-2008-4579

The (1) fence_apc and (2) fence_apc_snmp programs, as used in (a) fence 2.02.00-r1 and possibly (b) cman, when running in verbose mode, allows local users to append to arbitrary files via a symlink attack on the apclog temporary file.

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.gentoo.org/show_bug.cgi?id=240576
• http://secunia.com/advisories/32387
• http://secunia.com/advisories/32390
• http://secunia.com/advisories/36530
• http://secunia.com/advisories/43362
• http://www.openwall.com/lists/oss-security/2008/10/13/3
• http://www.redhat.com/support/errata/RHSA-2009-1341.html
• http://www.redhat.com/support/errata/RHSA-2011-0266.html
• http://www.securityfocus.com/bid/31904
• http://www.ubuntu.com/usn/USN-875-1
• http://www.vupen.com/english/advisories/2011/0419
• https://bugzilla.redhat.com/show_bug.cgi?id=467386
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10799
• https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00666.html