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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2008-4192
• https://bugs.gentoo.org/show_bug.cgi?id=235770
• https://bugzilla.redhat.com/show_bug.cgi?id=460476
• https://exchange.xforce.ibmcloud.com/vulnerabilities/44845
• https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00666.html
• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496410
• http://dev.gentoo.org/~rbu/security/debiantemp/cman
• http://secunia.com/advisories/31887
• http://secunia.com/advisories/32387
• http://secunia.com/advisories/32390
• http://secunia.com/advisories/43362
• http://uvw.ru/report.lenny.txt
• http://www.openwall.com/lists/oss-security/2008/09/18/3
• http://www.openwall.com/lists/oss-security/2008/09/24/2
• http://www.openwall.com/lists/oss-security/2008/10/30/2
• http://www.redhat.com/support/errata/RHSA-2011-0266.html
• http://www.securityfocus.com/bid/30898
• http://www.ubuntu.com/usn/USN-875-1
• http://www.vupen.com/english/advisories/2011/0419