October 2016
Intermediate to advanced
298 pages
5h 49m
English
Content preview from Mastering Modern Web Penetration TestingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Flash-based XSS – ExternalInterface.call()
In this section, I'll explain decompiling and exploiting Flash files for XSS. We will cover one commonly found XSS vector in Flash files that is user-supplied input reaching the ExternalInterface.call() function without proper filtering.
What is this ExternalInterface.call() thing, you might wonder. Simply speaking, it's an ActionScript (which complies with Flash) function and acts as a bridge between the Flash file and the JavaScript interface of the browser. The syntax of this function is as follows:
ExternalInterface.call("any-javascript-func", "arg");To execute eval(alert(1)), you should use the following syntax:
ExternalInterface.call("eval", "alert(1)");The equivalent JS generated would be as follows: ...
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