The pserver_shutdown function in fence_egenera in cman 2.20080629 and 2.20080801 allows local users to overwrite arbitrary files via a symlink attack on the /tmp/eglog temporary file.
https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00666.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/44845
https://bugzilla.redhat.com/show_bug.cgi?id=460476
https://bugs.gentoo.org/show_bug.cgi?id=235770
http://www.vupen.com/english/advisories/2011/0419
http://www.ubuntu.com/usn/USN-875-1
http://www.securityfocus.com/bid/30898
http://www.redhat.com/support/errata/RHSA-2011-0266.html
http://www.openwall.com/lists/oss-security/2008/10/30/2
http://www.openwall.com/lists/oss-security/2008/09/24/2
http://www.openwall.com/lists/oss-security/2008/09/18/3
http://uvw.ru/report.lenny.txt
http://secunia.com/advisories/43362
http://secunia.com/advisories/32390
http://secunia.com/advisories/32387
http://secunia.com/advisories/31887