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    <p>I work at Security Compass and am the lead developer for the Exploit Me tools. </p> <p>You're right that XSS Me is reporting a warning because these attack strings seem (to XSS Me) to have come back from the server completely unencoded. Another parser/JavaScript engine (like IE 6/7/8, Safari, or Chrome) might execute this code even though Firefox's parser and JavaScript engine don't. </p> <p>XSS Me submits two requests: </p> <ul> <li>One request where we detect exploitation using FireFox's JavaScript engine, which we call "errors"</li> <li>A second request where we detect exploitation by simply grepping for the attack string in the HTML response page</li> </ul> <p>The warning you're getting is caused by this second request. </p> <p>I can help you get to the root cause of this issue if you can do the following:</p> <ol> <li><p>Use packet sniffing software (i.e. Wireshark <a href="http://www.wireshark.org/" rel="noreferrer">http://www.wireshark.org/</a>) to detect the attack string rather than Charles. Sometimes proxies have a way of modifying or otherwise altering requests</p></li> <li><p>In Firefox, can you go to tools->addons and disable all the extensions except XSS Me? That way you can be sure no other extension is changing the response (or request) before it gets to XSS Me.</p></li> <li><p>View the source of the response page in Firefox to see if the unencoded string appears</p></li> </ol> <p>If you'd like to send me an email (tom@securitycompass.com) with those results I'd be happy to help figure this out. If it's a bug in XSS Me (which I certainly hope not) then I can patch it and get a new build out. </p> <p>Thanks,</p> <p>Tom</p>
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