AJAX Security

I read an interesting article today over at Darknet. It brings to light some of the “new” techniques that can be used to exploit newer Web 2.0 applications.


The article was an interesting read and got me thinking about application security again. I find myself spending more and more time on security in an application, and less time on features and actual logic. Generally I’m splitting coding time between idiot proofing the application so the end user is forced to put in the right data, and hack proofing the code against would-be hackers. Even with custom frameworks to handle the boring bits, it still takes a lot of time and effort to make sure you’ve covered your bases. Oh well, such is the world we live in nowadays.

The new ways to exploit applications are interesting as well. Actually, most of them aren’t new, but rather the same old hacks used to exploit the new way of doing things. For instance, in an AJAX application you pass information between the browser and the server, behind the scenes. Ok, all well and good, but how do you make sure you’re still talking to the original browser that opened the request? You could use a cookie, or perhaps some sort of a session ID. Maybe a combination of the two. And on top of it, you might check the User Agent string and the referrer URL. Mind you, this can all be spoofed. In fact, spoofing the UA and referrer is extremely easy and can be done with tools like curl and wget. So what is the best way to secure these apps?

I haven’t really started working with AJAX very seriously, so I haven’t done much research into the matter. But, thinking about it, maybe there is a way to secure things a little better? Perhaps a variable in the browsers memory rather than a cookie? Combined with a session ID? Right now I like to secure my apps by using a combination of a session ID, the IP address of the user, and a cookie with seemingly random data in it. This has worked pretty well thus far, but I’m not sure how hard anyone has tried to hack it. I’m definitely interested in more security, though, provided it doesn’t slow things to a grinding halt.

Of course, there’s always the one true way for security. Unplug it. Turn it off. If it’s not running, it can’t be broken into.. Well, not yet anyways.. There’s always the quantum level.

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