suPHP before 0.6.3 allows local users to gain privileges via (1) a race condition that involves multiple symlink changes to point a file owned by a different user, or (2) a symlink to the directory of a different user, which is used to determine privileges.
lists.marsching.biz/pipermail/suphp/2008-March/001750.html
secunia.com/advisories/29615
secunia.com/advisories/29648
secunia.com/advisories/29872
www.debian.org/security/2008/dsa-1550
www.securityfocus.com/bid/28568
www.vupen.com/english/advisories/2008/1073/references
bugzilla.redhat.com/show_bug.cgi?id=439687
exchange.xforce.ibmcloud.com/vulnerabilities/41582
www.redhat.com/archives/fedora-package-announce/2008-April/msg00014.html
www.redhat.com/archives/fedora-package-announce/2008-April/msg00075.html