Of course I had Google beforehand. But no good tutorial regarding the security issue and the solution so far.

But did you check Tutorials?

Tutorials: Web Programming: CGI Programming: Security in CGI Programming and Ovid's CGI Course Lesson 3 A brief overview of CGI and Web security

In reply to Re^5: Security issue and solution for terminal command accessed by public user by Anonymous Monk
in thread Security issue and solution for terminal command accessed by public user by keenlearner

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