full-disclosure - yahoomail dom based xss vulnerability

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Message-ID: <144100.40024.qm@web46104.mail.sp1.yahoo.com>
Date: Mon, 14 Jun 2010 21:50:33 -0700 (PDT)
From: pratul agrawal <pratulag@...oo.com>
To: security@...oo.com
Cc: full-disclosure@...ts.grok.org.uk, info@...t-in.org.in
Subject: yahoomail dom based xss vulnerability

Yahoo mail Dom Based Cross Site 
Scripting

                     Founder: Pratul Agrawal <pratulag[at]yahoo[dot]com>
DescriptionService: Webmail

Vendor: Yahoo mail, and possibly others

Vulnerability: Cross Site Scripting / Cookie-Theft / Relogin attacks

Severity: High

Tested on: Microsoft IE 7.0

Details:

Yahoo mail filter fails to detect script attributes in combination with

the style attribute as a tag, leaving everyone using yahoo mail service

with MSIE vulnerable to Cross Site Scripting including Cookie Theft and

relogin attacks.

Impact:

This is totally a dom based xss attack. an application takes the user 
suplied data and directly feed it into the API designed to show the 
Newly created folder name n the yahoomail. Throug this an attacker can 
easily perform a cookie theft attack, Site defacement attack and many 
more.Steps To 
Reproduce1. Login the yahoomail with 
valid credentials.

2. Click on inbox.

3. Now click on Move < [New Folder].

4. Now enter the javascript "><script>alert('yahoo')</script> in the field given for creating new folder.

5. Press OK and the script get executed.  yahhhhooooo
Best Regards,
Pratul Agrawal

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