This is a whitepaper tutorial that describes steps taken to identify post-authentication remote code execution vulnerabilities in ManageEngine version 14.
You can download it from the following link: https://packetstormsecurity.com/files/download/157159/manageengine14-exec.pdf
Source: https://packetstormsecurity.com/files/157159/ManageEngine-14-Remote-Code-Execution.html