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