[Full-disclosure] Skype Vendor Website - Cross Site Scripting Vulnerability

["research@xxxxxxxxxxxxxxxxxxxxx" <research@xxxxxxxxxxxxxxxxxxxxx>]

Title:
======
Skype Vendor Website - Cross Site Scripting Vulnerability


Date:
=====
2011-11-11


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=309


VL-ID:
=====
309


Introduction:
=============
Skype is a software application that allows users to make voice and video calls 
and chats over the Internet. Calls to other users within the
Skype service are free, while calls to both traditional landline telephones and 
mobile phones can be made for a fee using a debit-based
user account system. Skype has also become popular for its additional features 
which include instant messaging, file transfer, and
videoconferencing. Skype has 663 million registered users as of 2010.  The 
network is operated by Skype Limited, which has its headquarters
in Luxembourg. Most of the development team and 44% of the overall employees of 
Skype are situated in the offices of Tallinn and Tartu, Estonia.

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


Abstract:
=========
The Vulnerability-Lab Team discovered a cross site scripting vulnerability on 
the Skype main vendor website.


Report-Timeline:
================
2011-11-04:     Vendor Notification
2011-11-05:     Vendor Response/Feedback
2011-11-10:     Vendor Fix/Patch 
2011-11-11:     Public or Non-Public Disclosure


Status:
========
Published


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


Severity:
=========
Low


Details:
========
A non-persistent cross site scripting vulnerability is detected on the Skype 
vendor website. The vulnerability allows remote 
attackers to hijack skype customer sessions via cross site scripting. 
Successful exploitation of the client-side vulnerability 
can result in session hijacking & account steal.


Vulnerable Module(s):
                                                        [+] Subscriptions to 
call a single country

Affected Module(s):
                                                        [+] Skype.com

Picture(s):
                                                        ../ive1.png
                                                        ../ive2.png
                                                        ../ive3.png


Proof of Concept:
=================
The vulnerabilities can be exploited by remote attackers on client-side via 
required user inter action. 
For demonstration or reproduce ...

PoC:
"><img src="tester1337.png" onerror=alert("CROSS-SITE-SCRIPTING") />


Reference(s): 
www.skype.com/intl/en/prices/pay-monthly-new


Risk:
=====
The security risk of the non persistent cross site scripting vulnerability is 
estimated as low(+).


Credits:
========
Vulnerability Research Laboratory -  Aditya Gupta


Disclaimer:
===========
The information provided in this advisory is provided as it is without any 
warranty. Vulnerability-Lab disclaims all warranties, 
either expressed or implied, including the warranties of merchantability and 
capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, 
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may not apply. Any modified copy or reproduction, including partially usages, 
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Lab. Permission to electronically redistribute this alert in its unmodified 
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other media, are reserved by Vulnerability-Lab or its suppliers.

                                                Copyright © 
2011|Vulnerability-Lab




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