This is a whitepaper tutorial that walks through creating a proof of concept exploit for a pre-authentication remote command execution vulnerability in Symantec Web Gateway version 5.0.2.8.
You can download it from the following link: https://packetstormsecurity.com/files/download/157157/symantecwg-exec.pdf
Source: https://packetstormsecurity.com/files/157157/Symantec-Web-Gateway-5.0.2.8-Remote-Command-Execution.html