September 2002
Intermediate to advanced
544 pages
13h 6m
English
Content preview from Sams Teach Yourself CGI in 24 Hours, Second Edition
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Common CGI Security Holes
You can make several common mistakes when you code CGI scripts that can make it easy for intruders to break into your Web server. If you avoid these pitfalls, you’ll be way ahead of the game when it comes to protecting your server from attack.
A Note on How CGI Works
One thing you might not realize is that users can always access your CGI scripts without using the interface you’ve provided when they know where the CGI script is. For example, you might be using maxsize attributes on all your text entry fields, and you might validate all the form input using JavaScript before it’s sent to the CGI script, but users can bypass all that if they choose to, especially if your form uses the GET method.
Remember that the
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.