This is a whitepaper tutorial that describes steps taken to identify post-authentication remote code execution vulnerabilities in Symantec Web Gateway version 5.0.2.8.
You can download it from the following link: https://packetstormsecurity.com/files/download/157163/symantecwg5028-exec.pdf
Source: https://packetstormsecurity.com/files/157163/Symantec-Web-Gateway-5.0.2.8-Remote-Code-Execution.html