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Proof of concept code (which means poor code quality) for a proxy abusing unrestricted cross domain policies. http://erlend.oftedal.no/blog/?blogid…
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This is a Proof-Of-Concept and thus the code quality is very poor and it has some limitations (see below). Any help in approving it appreciated. Brief overview -------------- The backend is what the attacker's browser connects to on port 8080 The silverlight or flex RIA connects to the backend on a seperate download port. This port is set when starting the backend, and it must be 4502-4530 for silverlight (for flex it can be almost any port). The backend forwards the url to either the flex/silverlight RIA which runs in the victim's browser. The RIA downloads the data on behalf of the victim (using the victim's cookies etc.), and passes the data back to the backend, which then sends it back to the attacker. To be able to connect to a socket, the flex or silverlight RIA tries to download a socket policy file on port 843 and 943 respectively. So the backend listens on these ports and supplies files as needed. If the flex RIA is not able to connect to 843, it will try to download the socket policy through the download port mentioned above. Current limitations ------------------- - The proxy runs the requests as a FIFO - not multithreaded