Download Ajax Security by Billy Hoffman PDF

By Billy Hoffman

This ebook might be required interpreting for somebody who's constructing, operating with, or maybe coping with an internet software. the appliance does not also have to exploit Ajax. many of the options during this publication are safeguard 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 even if an program makes use of Ajax or no longer, yet Ajax offers an attacker different "entry issues" to aim to assault your program. each one carrier, 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 booklet is the bankruptcy on buyer facet garage (i.e. cookies, Flash info gadgets, neighborhood storage), yet this isn't the authors' fault. the subject itself is not fascinating and that i chanced on myself examining it speedy so i'll get to the following bankruptcy. essentially the most attention-grabbing chapters is the only on JavaScript worms, just like the Samy bug. additionally fascinating 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 by myself, which has the potential of scanning IP addresses and detecting the kind of internet server they run (using the JS photograph object). one other attention-grabbing instance was once utilizing the :hover CSS classification besides JavaScript to discover websites person has visited.

After studying this e-book, i'm discovering myself correcting protection blunders i'm in basic terms be aware of discovering in my initiatives. a few corrections i have made trouble JSON, the GET vs. publish factor, and others. With the corrections made, i think that my purposes are much more secure. This e-book helped make that occur.

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Sample text

Eve now understands the format of the requests to the flight search Web service. Eve knows that the departure airport, destination airport, and flight are all most likely passed to a database of some kind to find matching flights. Eve decides to try a simple probe to see if this backend database might be susceptible to a SQL Injection attack. She configures her proxy with some find-andreplace rules. net. Eve’s ' OR probe in each value might create a syntax error in the database query and give her a database error message.

In our earlier example (the page that displayed the current time) the data was transferred across the network as plain, unencapsulated text that was then dropped directly into the page DOM. DYNAMIC HTML (DHTML) While dynamic HTML (DHTML) is not part of the Ajax “acronym” and XML is, clientside manipulation of the page content is a much more critical function of Ajax applications than the parsing of XML responses. We can only assume that “Ajad” didn’t have the same ring to it that “Ajax” did. Once a response is received from the asynchronous request, the data or page fragment contained in the response has to be inserted back into the current page.

ReadyState The state of the request. A value of 4 indicates that a response has been received from the server. Note that this does not necessarily indicate that the request was successful. responseText The text of the response received from the server. The XHR object is first used when the user presses the Refresh button. Instead of submitting a form back to the server as in the first sample, the Ajax sample executes the JavaScript method getCurrentTime. php and registers the function handleCurrentTimeChanged as a callback method (that is, the method that will be called when the request state changes).

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