Directory traversal vulnerability in PHP 5.2.4 and earlier allows attackers to bypass open_basedir restrictions and possibly execute arbitrary code via a .. (dot dot) in the dl function.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36528
http://www.securityfocus.com/archive/1/478989/100/0/threaded
http://www.securityfocus.com/archive/1/478988/100/0/threaded
http://www.securityfocus.com/archive/1/478985/100/0/threaded
http://www.php.net/releases/5_2_5.php
http://www.php.net/ChangeLog-5.php#5.2.5
http://www.gentoo.org/security/en/glsa/glsa-200710-02.xml
http://securityreason.com/securityalert/3119
http://secunia.com/advisories/28658
http://secunia.com/advisories/27102
http://lists.opensuse.org/opensuse-security-announce/2008-01/msg00006.html