[Full-disclosure] Microsoft MSN Hotmail - Password Reset & Setup Vulnerability

[Research <research@xxxxxxxxxxxxxxxxxxxxx>]

Title:
======
Microsoft MSN Hotmail - Password Reset & Setup Vulnerability


Date:
=====
2012-04-26


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=529
http://news.softpedia.com/news/Critical-0-Day-in-Hotmail-Exploited-in-Wild-Microsoft-Issues-Fix-266506.shtml
http://news.hitb.org/content/0day-remote-password-reset-vulnerability-msn-hotmail-patched


VL-ID:
=====
529


Introduction:
=============
Hotmail (also known as Microsoft Hotmail and Windows Live Hotmail), is a free 
web-based email service operated by 
Microsoft as part of Windows Live. One of the first web-based email services, 
it was founded by Sabeer Bhatia and 
Jack Smith and launched in July 1996 as HoTMaiL. It was acquired by Microsoft 
in 1997 for an estimated $400 
million, and shortly after it was rebranded as MSN Hotmail. The current version 
was released in 2007. Hotmail 
features unlimited storage, Ajax, and integration with Microsofts instant 
messaging (Windows Live Messenger), 
calendar (Hotmail Calendar), file hosting service (SkyDrive) and contacts 
platform. According to comScore (August 2010) 
Windows Live Hotmail is the world s largest web-based email service with 364 
million members, followed by Gmail and 
Yahoo! Mail, respectively. It is available in 36 different languages. Hotmail 
is developed from Mountain View, 
California. When Hotmail Corporation was an independent company, its 
headquarters was in Sunnyvale. 

(Copy of the Vendor Homepage: http://en.wikipedia.org/wiki/Hotmail )


Abstract:
=========
Vulnerability-Lab Team discovered a Password Reset Vulnerability on Microsofts 
official MSN Hotmail service.


Report-Timeline:
================
2012-04-06:     Researcher Notification & Coordination
2012-04-20:     Vendor Notification
2012-04-20:     Vendor Response/Feedback
2012-04-20:     Vendor Fix/Patch [#HOTFIX]
2012-04-26:     Public or Non-Public Disclosure


Status:
========
Published


Affected Products:
==================
Microsoft Corporation
Product: MSN - Hotmail v2012 - Q1 & Q2


Exploitation-Technique:
=======================
Remote


Severity:
=========
Critical


Details:
========
A high severity password reset vulnerability is detected in Microsofts official 
MSN Hotmail service.
A Vulnerability Laboratory senior researcher, Benjamin Kunz Mejri, identified a 
critical security vulnerability 
in Microsoft’s official MSN Hotmail (Live) service. A critical vulnerability 
was found in the password reset 
functionality of Microsoft’s official MSN Hotmail service.  The vulnerability 
allows an attacker to reset the Hotmail/MSN 
password with attacker chosen values.  Remote attackers can bypass the password 
recovery service to setup a new password 
and bypass in place protections (token based).  The token protection only 
checks if a value is empty then blocks or 
closes the web session. A remote attacker can, for example bypass the token 
protection with values “+++)-“.  
Successful exploitation results in unauthorized MSN or Hotmail account access. 
An attacker can decode CAPTCHA & 
send automated values over the MSN Hotmail module.

Vulnerable Module(s): 

                                        [+] Password Recovery Service & New Pass


Proof of Concept:
=================
The vulnerability can be exploited by remote attacker without required user 
inter action. For demonstration or reproduce ...

Note: To exploit the vulnerability only  a browser and a url (GET|POST) tamper 
is required.

Exploitation Techique(s):
                                        [+] Bypass the Recovery Mod Page to New 
Pass or Reset
                                        [+] Bypass token protection via not 
empty value or positiv value(s)
                                        [+] Setup new password
                                        [+] Decode captcha & send automatique 
values


Solution:
=========
2012-04-20:     Vendor Fix/Patch [#HOTFIX] - Coordination MSRC Team


Risk:
=====
The security risk of the remote password reset vulnerability is estimated as 
critical.


Credits:
========
Vulnerability Laboratory [Research Team]  -    Benjamin Kunz Mejri (Rem0ve)


Disclaimer:
===========
The information provided in this advisory is provided as it is without any 
warranty. Vulnerability-Lab disclaims all warranties, 
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capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, 
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or incidental damages so the foregoing limitation 
may not apply. Any modified copy or reproduction, including partially usages, 
of this file requires authorization from Vulnerability-
Lab. Permission to electronically redistribute this alert in its unmodified 
form is granted. All other rights, including the use of 
other media, are reserved by Vulnerability-Lab or its suppliers.

                                                Copyright © 2012 
Vulnerability-Lab




-- 
VULNERABILITY RESEARCH LABORATORY TEAM
Website: www.vulnerability-lab.com
Mail: research@xxxxxxxxxxxxxxxxxxxxx


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