Ajax Security by Billy Hoffman

By Billy Hoffman

This booklet will be required interpreting for somebody who's constructing, operating with, or perhaps coping with an internet software. the appliance does not also have to exploit Ajax. lots of the suggestions during this booklet are safeguard practices for non-Ajax functions which were prolonged and utilized to Ajax; no longer the opposite direction round. for instance, SQL injection assaults can exist no matter if an software makes use of Ajax or no longer, yet Ajax presents an attacker different "entry issues" to aim to assault your software. every one provider, procedure, and parameter is taken into account an access point.

The ebook itself is easily written. the fashion of writing is enticing. the one non-exciting a part of the ebook is the bankruptcy on shopper aspect garage (i.e. cookies, Flash facts gadgets, neighborhood storage), yet this isn't the authors' fault. the subject itself isn't interesting and that i stumbled on myself analyzing it fast so i may get to the subsequent bankruptcy. probably the most fascinating chapters is the only on JavaScript worms, just like the Samy computer virus. additionally attention-grabbing are the occasional mentions of stories and discoveries within the defense neighborhood. for instance, the authors describe a proof-of-concept port scanner they wrote utilizing JavaScript on my own, which has the potential of scanning IP addresses and detecting the kind of net server they run (using the JS picture object). one other attention-grabbing instance used to be utilizing the :hover CSS category besides JavaScript to become aware of websites person has visited.

After analyzing this ebook, i'm discovering myself correcting safeguard blunders i'm simply be aware of discovering in my tasks. a few corrections i have made obstacle JSON, the GET vs. put up factor, and others. With the corrections made, i think that my purposes are much more secure. This ebook helped make that take place.

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Not only is this a big mistake when it comes to deploying secure Web sites, it’s also a sign of sloppy administrators or an IT department in a cash crunch. Either way, it’s a good sign for Eve. HACKING THE COUPON SYSTEM Eve continues using the site and ends up in the checkout phase when she notices something interesting: a Coupon Code field on the form. She types in FREE and tabs to the next field on the form. Her browser immediately displays an error message telling Eve that her coupon code is not valid.

Html No Different port 10 THE AJAX ARCHITECTURE SHIFT The Same Origin Policy also prevents JavaScript from opening XMLHttpRequests to any server other than the same Web server that the user is currently visiting. XML XML is the last component of Ajax; and, to be perfectly honest, it is probably the least important component. JavaScript is the engine that makes the entire process of partial updates possible; and asynchronicity is a feature that makes partial updates worth doing; but, the use of XML is really just an optional way to build the requests and responses.

Earlier, we described thick-client applications as insecure because they could be decompiled and analyzed by an attacker. The same problem exists with Ajax applications, and, in fact, even more so, because in most cases the attacker does not even need to go to the effort of decompiling the program. JavaScript is what is known as an 18 THE AJAX ARCHITECTURE SHIFT interpreted language, rather than a compiled language. When a developer adds clientside JavaScript to his Web application, he actually adds the source code of the script to the Web page.

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