The stripos function in PHP before 5.1.5 has unknown impact and attack vectors related to an out-of-bounds read.
http://www.vupen.com/english/advisories/2006/3318
http://www.ubuntu.com/usn/usn-362-1
http://www.securityfocus.com/bid/19582
http://www.php.net/release_5_1_5.php
http://www.mandriva.com/security/advisories?name=MDKSA-2006:162
http://support.avaya.com/elmodocs2/security/ASA-2006-223.htm
http://securitytracker.com/id?1016984
http://secunia.com/advisories/22538
http://secunia.com/advisories/22331
http://secunia.com/advisories/21842