Google Youtube Filter Bypass / Cross Site Scripting

`Document Title:  
===============  
Google Youtube - Filter Bypass & Persistent Vulnerability [9-5942000004564] (PoC Video Demonstration)  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=1352  
  
Google Security ID: [9-5942000004564]  
  
View: https://www.youtube.com/watch?v=656LM9zGLxc  
  
Article: http://vulnerability-db.com/magazine/articles/2014/10/25/google-youtube-persistent-cross-site-vulnerability-demonstration-video  
  
  
Release Date:  
=============  
2014-10-25  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1352  
  
  
Common Vulnerability Scoring System:  
====================================  
3.9  
  
  
Discovery Status:  
=================  
Published  
  
  
Exploitation Technique:  
=======================  
Offensiv  
  
  
Severity Level:  
===============  
Medium  
  
  
Technical Details & Description:  
================================  
The independent vulnerability researcher jasminder pal has discovered a persistent cross site scripting vulnerability in the google youtube ui.  
By usage of a filter bypass method the issue becomes exploitable in different application layers that are connected to the vulnerable values.  
Google security send a reward of 1337$ to the researcher that discovered the vulnerability during the official bug bounty program.  
  
Reproduction Steps :  
1. Create a playlist name [ t" onmouseover=alert(/xss/); a=" ] . * Without rectangle braces [ ] .  
2. Now there are multiple places where this above js code will execute.   
One is Click edit on any of your uploaded video . On editor page click on Add to Playlist.   
When you mouseover the playlist name the above js code will execute.   
Other locations where the code executes is when an youtube user is uploading a video , there it ask for Add to the playlist.  
  
  
Credits & Authors:  
==================  
Jasminder Pal Singh - @singh_jasminder [http://jasminderpalsingh.info]  
  
  
Disclaimer & Information:  
=========================  
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