PHP 5.x Remote Code Execution Exploit available since 2013-10-29. Usage found in logs since 2013-11-04.
sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script
(aka php-cgi), does not properly handle query strings that lack an = (equals sign)...