bugtraq - Google Youtube - Filter Bypass & Persistent Vulnerability [9-5942000004564] (PoC Video Demonstration)

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Date: Mon, 27 Oct 2014 16:27:56 +0100
From: Vulnerability Lab <research@...nerability-lab.com>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com
Subject: Google Youtube - Filter Bypass & Persistent Vulnerability [9-5942000004564]
 (PoC Video Demonstration)

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]

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=========================
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