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.
bugs.debian.org/cgi-bin/bugreport.cgi?bug=496410
dev.gentoo.org/~rbu/security/debiantemp/cman
secunia.com/advisories/31887
secunia.com/advisories/32387
secunia.com/advisories/32390
secunia.com/advisories/43362
uvw.ru/report.lenny.txt
www.openwall.com/lists/oss-security/2008/09/18/3
www.openwall.com/lists/oss-security/2008/09/24/2
www.openwall.com/lists/oss-security/2008/10/30/2
www.redhat.com/support/errata/RHSA-2011-0266.html
www.securityfocus.com/bid/30898
www.ubuntu.com/usn/USN-875-1
www.vupen.com/english/advisories/2011/0419
bugs.gentoo.org/show_bug.cgi?id=235770
bugzilla.redhat.com/show_bug.cgi?id=460476
exchange.xforce.ibmcloud.com/vulnerabilities/44845
www.redhat.com/archives/fedora-package-announce/2008-October/msg00666.html