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    <ol> <li><p>It could not be a JavaScript injection, as what in the Flash Player would interpret JS? The flash community would be ecstatic if we had native JS or even json support in the player. There is no eval function for actionscript let alone javascript</p></li> <li><p>Let's assume they meant you could inject it with actionscript. The AMF protocol does not send code, it sends data models in the form of primitive types or generic or typed objects. The worst thing that could happen is that they analyze your model and add additional data. This would be amazingly difficult to do as you would not be able to inject the data but would have to parse all the data, add the new data, parse it back and keep the AMF headers. Because AMF uses references in it's data serialization which means that when duplicate object types you would have had to of seen the first object. The reference is then an offset which means little chance of adding code but only changing values to existing parameters. </p></li> <li><p>The remote object has a response handler that is checking for the data types and expects to bind those data types to ui components or whatever your code does. If those data types are wrong you will get an error. If the AMF response sequence number is wrong you will get an error. If anything is not perfectly formed in the amf datagram you will get an error.</p></li> <li><p>Remote object automatically retry. If the "injecting" code takes to long Flex will resend a message and invalidate the one that took to long. </p></li> </ol> <p>Just my two cents. As an AMF developer I have frequently wished it was easy to screw with the amf datagram for debugging and testing. Unfortunately you will get an error. </p> <p>Wade Arnold</p>
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    1. POAMF and Cross Site scripting vulnerabilty confusion
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    1. USWade Arnold
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    1. CO+1 listen to this man, he is highly experienced with AMF. Basically it is impossible to do an JS XSS attack with AMF. It may be possible if you did some really insane coding (extracting data from AMF, passing it out to JS, and calling an eval() on it...but that is so unlikely it's silly). Deloitte basically doesn't know what they're talking about, I'm sorry if you had to pay huge sacks of $$$ to them for the 'audit'.
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    2. COI'm +1ing Wade too. For those that don't know; he was the project lead on AMF PHP for a while and was deeply involved in the Zend AMF project. You'd be hard pressed to find a non-Adobe Engineer who knows AMF better than he.
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    3. COGreat answer Wade! One thing to add... HTTPS can be used as the transport for AMF which would protect against man-in-the-middle attacks.
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      1. USJames Ward
 

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