Title:
======
ImageShack Service - Cross Site Scripting Vulnerability


Date:
=====
2011-12-21


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=352


VL-ID:
=====
352


Introduction:
=============
ImageShack is a free image hosting website. ImageShack has a subscription service but the
majority of its revenue is produced from advertising related to its free image hosting.
The imageshack.us Alexa ranking in September 25, 2007 was one of the top 40, but now as
of September 25, 2011 it s dropped to 135. According to Nielsen//NetRatings, ImageShack
was the fourth fastest growing web brand in July 2006.

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


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


Report-Timeline:
================
2011-11-07:  Vendor Notification
2011-12-21:  Public or Non-Public Disclosure


Status:
========
Published


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


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


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


Vulnerable Module(s):
                                [+] Slideshow

Affected Module(s):
              [+] webplayer.php

Picture(s):
                                      ../imageshack.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(1337) />

Code Review:
Failed to load album \"><img src=tester1337.png onerror=alert(1337) /> - no slides

Reference(s): 
http://img29.imageshack.us/slideshow/webplayer.php?id=


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


Credits:
========
Vulnerability Research Laboratory -  Chokri B.A. (Meister)


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, indirect, incidental, consequential loss of business 
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some 
states do not allow the exclusion or limitation of liability for consequential 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 © 2011|Vulnerability-Lab




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