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Microsoft PhotoStory CS Cross Site Scripting

Microsoft PhotoStory CS Cross Site Scripting
Posted Dec 13, 2013
Authored by Muhammad A.S., Vulnerability Laboratory | Site vulnerability-lab.com

Microsoft PhotoStory suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | a28bfc6192eee283fc89e1171132bf7f47271fa8391894f76eec1341deb61b3d

Microsoft PhotoStory CS Cross Site Scripting

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Document Title:
Microsoft PhotoStory - CS Cross Site Scripting Vulnerability

References (Source):

Microsoft Security Response Center (MSRC) ID: 15155

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

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

Exploitation Technique:

Severity Level:

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
buffer = 0.500000;
// [Action in Frame 3]


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@gmail.com]

Disclaimer & Information:
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. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases
or trade with fraud/stolen material.

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Copyright © 2013 | Vulnerability Laboratory [Evolution Security]

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