By Jay Beale
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Extra resources for Cross Site Scripting Attacks
17, the DOM contains a long list of elements. The DOM element alert is a standard built-in function, while logout is a function provided by Google Inc. By using FireBug DOM Explorer, we can examine each part of the currently opened application. We can see all functions and their source code. We can also see every property and object that is available and expand them to see their sub-properties in a tree-like structure. 18). This view is extremely helpful when we want to monitor the Web requests that are made from inside the application.
27 shows the Host header injected in the Modify Headers window. Probably one of the most useful purposes of this extension is to locate XSS vulnerabilities that occur when different encodings are used. Keep in mind that XSS issues are not that straightforward, and if you cannot find a particular application vulnerability when using the default configuration of your browser, it may appear as such if you change a few things, like the accepted charset as discussed previously in this section. 27 Injecting the Host Header with Modify Headers TamperData Another useful extension that you can put together with the LiveHTTPHeaders and ModifyHeaders extensions is TamperData.
... This can be highly useful in dozens of different applications, but most importantly it can help you diagnose what your own scripts are doing when they fail.