Ajax Security by Billy Hoffman

By Billy Hoffman

This e-book will be required analyzing for someone who's constructing, operating with, or maybe handling an online program. the appliance does not also have to exploit Ajax. many of the techniques during this publication are protection practices for non-Ajax functions which were prolonged and utilized to Ajax; now not the wrong way round. for instance, SQL injection assaults can exist no matter if an software makes use of Ajax or now not, yet Ajax offers an attacker different "entry issues" to aim to assault your software. each one provider, process, and parameter is taken into account an access point.

The ebook itself is easily written. the fashion of writing is attractive. the single non-exciting a part of the e-book is the bankruptcy on buyer aspect garage (i.e. cookies, Flash info items, neighborhood storage), yet this isn't the authors' fault. the subject itself isn't very interesting and that i stumbled on myself studying it speedy so i'll get to the subsequent bankruptcy. essentially the most attention-grabbing chapters is the single on JavaScript worms, just like the Samy trojan horse. additionally fascinating are the occasional mentions of reports and discoveries within the protection group. for instance, the authors describe a proof-of-concept port scanner they wrote utilizing JavaScript on my own, which has the aptitude of scanning IP addresses and detecting the kind of internet server they run (using the JS picture object). one other fascinating instance used to be utilizing the :hover CSS category besides JavaScript to observe websites consumer has visited.

After analyzing this publication, i'm discovering myself correcting defense mistakes i'm in simple terms be aware of discovering in my tasks. a few corrections i have made predicament JSON, the GET vs. put up factor, and others. With the corrections made, i think that my functions are much more secure. This ebook helped make that occur.

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He can also potentially change the program, perhaps in order to crack its licensing scheme. In short, the client machine is an uncontrollable, hostile environment and a poor location in which to store secret information. The security risks of thick-client applications are summarized in Table 1-2. 16 THE AJAX ARCHITECTURE SHIFT Table 1-2 Security risks of thick-client applications Risk Applicable to thick-client applications? Application logic is accessible on the client X Messages between client and server are easily intercepted and understood The application is generally accessible to anonymous public users A SECURITY PERSPECTIVE:THIN-CLIENT APPLICATIONS Thin-client programs have a different set of security concerns (see Table 1-3).

The browser’s only role was to send requests to the Web server and render the returned HTML response so that a user could view it. The thin-client architecture solved the update problem that had plagued the thickclient developers. A Web browser acts as a universal client and doesn’t know or care what happens on the server side. The application can be modified on the server side every day, or ten times a day, and the users will just automatically pick up the changes. No reinstallations or reboots are required.

This methodology not only satisfies our need for quick, smooth updates, but because the requests are made asynchronously, the user can even continue to use the application while the requests are in progress. W HAT A JAX I S N OT It is worth noting not just what Ajax is, but what it is not. Most people understand that Ajax is not a programming language in itself, but rather a collection of other technologies. What may be more surprising is that Ajax functionality is not something that necessarily needs to be turned on by the server.

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