Monstra CMS 3.0.4 - Remote Code Execution

# Exploit Title: Monstra CMS 3.0.4 Upload Plugin Remote code execution CVE-2018-9037
# Date: 2018-05-14
# Exploit Author: Jameel Nabbo
# Vendor Homepage: https://github.com/monstra-cms/monstra
# Software Link: https://github.com/monstra-cms/monstra
# Version: 3.0.4
# Tested on: MAC OSX
# CVE :CVE-2018-9037


Monstra CMS 3.0.4 allows remote code execution via an upload_file request for a .zip file,
which is automatically extracted and may contain .php files.


Steps to Reproduce
1: Log in as a user with page editing permissions
2: Upload a plugin archive containing php webshell code
3: After successful upload we can execute the command.

Then go to: http://127.0.0.1/plugins/{Name_Of_Zip_File_You_Uploaded}/{File_In_Zip}.php

Solution
Filter plugin content during plugin upload