Directory traversal vulnerability in the posix_access function in PHP 5.2.6 and earlier allows remote attackers to bypass safe_mode restrictions via a .. (dot dot) in an http URL, which results in the URL being canonicalized to a local filename after the safe_mode check has successfully run.
http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
http://marc.info/?l=bugtraq&m=124654546101607&w=2
http://marc.info/?l=bugtraq&m=125631037611762&w=2
http://secunia.com/advisories/32746
http://secunia.com/advisories/35074
http://secunia.com/advisories/35650
http://security.gentoo.org/glsa/glsa-200811-05.xml
http://securityreason.com/achievement_securityalert/54
http://securityreason.com/securityalert/3941
https://exchange.xforce.ibmcloud.com/vulnerabilities/43196
http://support.apple.com/kb/HT3549
http://wiki.rpath.com/Advisories:rPSA-2009-0035
http://www.securitytracker.com/id?1020327