transports/appendfile.c in Exim before 4.72, when MBX locking is enabled, allows local users to change permissions of arbitrary files or create arbitrary files, and cause a denial of service or possibly gain privileges, via a symlink attack on a lockfile in /tmp/.
http://archives.neohapsis.com/archives/fulldisclosure/2010-06/0079.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-June/042587.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-June/042613.html
http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
https://bugzilla.redhat.com/show_bug.cgi?id=600097
http://secunia.com/advisories/40019
http://secunia.com/advisories/40123
http://secunia.com/advisories/43243
https://exchange.xforce.ibmcloud.com/vulnerabilities/59042
http://www.ubuntu.com/usn/USN-1060-1