PHP before 5.3.7 does not properly implement the error_log function, which allows context-dependent attackers to cause a denial of service (application crash) via unspecified vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/69428
http://www.securityfocus.com/bid/49241
http://www.php.net/archive/2011.php#id2011-08-18-1
http://www.php.net/ChangeLog-5.php#5.3.7
http://www.mandriva.com/security/advisories?name=MDVSA-2011:165
http://support.apple.com/kb/HT5130
http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.html