Title:
======
Microsoft SharePoint 2013 (Cloud) - Persistent Exception Handling Web Vulnerability



Date:
=====
2013-09-11


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=812

Security Bulletin: MS13-067
http://technet.microsoft.com/de-de/security/bulletin/MS13-067

Microsoft Security Response Center (MSRC) ID: 14096




VL-ID:
=====
812


Common Vulnerability Scoring System:
====================================
5.7


Introduction:
=============
Microsoft SharePoint is a Web application platform developed by Microsoft. First launched in 2001, SharePoint has historically been 
associated with intranet content management and document management, but recent versions have significantly broader capabilities. 
Microsoft has two versions of SharePoint available at no cost, but it sells premium editions with additional functionality, and 
provides a cloud service edition as part of their Office 365 platform (previously BPOS). The product is also sold through a cloud 
model by many third-party vendors.

SharePoint comprises a multipurpose set of Web technologies backed by a common technical infrastructure. By default, SharePoint has a 
Microsoft Office-like interface, and it is closely integrated with the Office suite. The web tools are designed to be usable by non-
technical users. SharePoint can be used to provide intranet portals, document & file management, collaboration, social networks, extranets, 
websites, enterprise search, and business intelligence. It also has system integration, process integration, and workflow automation capabilities.

Enterprise application software (e.g. ERP or CRM packages) often provide some SharePoint integration capability, and SharePoint also 
incorporates a complete development stack based on web technologies and standards-based APIs. As an application platform, SharePoint provides 
central management, governance, and security controls for implementation of these requirements. The SharePoint platform integrates directly 
into IIS - enabling bulk management, scaling, and provisioning of servers, as is often required by large organizations or cloud hosting providers.
In 2008, the Gartner Group put SharePoint in the`leaders` quadrant in three of its Magic Quadrants (for search, portals, and enterprise content 
management). SharePoint is used by 78% of Fortune 500 companies[citation needed]. Between 2006 to 2011, Microsoft sold over 36.5 million user 
licenses[citation needed].

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


Abstract:
=========
The Vulnerability Laboratory Research Team discovered a persistent web vulnerability in the official Microsoft Sharepoint Online (cloud-based) application.


Report-Timeline:
================
2013-02-01:	Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-02-06:	Vendor Notification (Microsoft Security Response Center - MSRC)
2013-02-07:	Vendor Response/Feedback (Microsoft Security Response Center - MSRC)
2013-09-11:	Vendor Fix/Patch (Microsoft Security Bulletin)
2013-09-11:	Public Disclosure (Vulnerability Laboratory)


Status:
========
Published


Affected Products:
==================
Microsoft Corp.
Product: Sharepoint Online (Cloud-Based)


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


Severity:
=========
High


Details:
========
A persistent input validation vulnerability is detected in the official Microsoft Sharepoint 2013 Online (cloud-based) web-application.
The vulnerability allows remote attackers to inject own malicious script code to a vulnerable module on application-side (persistent).

The vulnerability is located in the `Sharepoint Online Cloud 2013 Service` section when processing to request the `Berechtigungen für 
den Metadatenspeicher festlegen` module with manipulated ms-descriptionText > ctl00_PlaceHolderDialogBodySection_
PlaceHolderDialogBodyMainSection_ValSummary parameters. The persistent injected script code execution occurs in the main 
`invalid BDC Übereinstimmung` web application exception-handling.

The vulnerability can be exploited with a low (restricted) privileged application user account and low or medium required user interaction.
Successful exploitation of the vulnerability result in persistent session hijacking, persistent phishing, stable external redirect, stable 
external malware loads and persistent vulnerable module context manipulation.

Vulnerable Service(s):
				[+] Microsoft - Sharepoint Online (cloud-based)

Vulnerable Module(s):
				[+] Berechtigungen für den Metadatenspeicher festlegen - BDC Metadatenspeicher zuweisen

Vulnerable Parameter(s):
				[+] ms-descriptionText > ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_ValSummary
				[+] TA_ManageBDCPermissions_data

Affected Module(s):
				[+] BDC Übereinstimmung > Exception Handling


Proof of Concept:
=================
The persistent input validation web vulnerability can be exploited by remote attackers with low required user interaction and low privileged 
sharepoint cloud application user account. For demonstration or reproduce ...

Review: Berechtigungen für den Metadatenspeicher festlegen - Summery > BDC Übereinstimmung > Exception (TA_ManageBDCPermissions_data)

<table class="propertysheet" border="0" cellpadding="0" cellspacing="0" width="100%"> <tbody><tr> <td class="ms-descriptionText"> 
<span id="ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_LabelMessage" class="ms-descriptionText"></span> </td> 
</tr> <tr> <td class="ms-error"><span id="ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_LabelErrorMessage">
Fehler beim Versuch, 'IMetadataCatalog' eine Zugriffssteuerungsliste mit dem 
Namen 'ApplicationRegistry' zuzuweisen. Mindestens ein Benutzer oder 
eine Gruppe in der Zugriffssteuerungsliste muss über das Recht 
'SetPermissions' verfügen, um das Erstellen eines nicht verwaltbaren 
Objekts zu verhindern.</span></td> </tr> <tr> <td class="ms-descriptionText"> 
<div id="ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_ValSummary" style="color:Red;">Mindestens ein Fehler auf der Seite. 
Beheben Sie Folgendes, bevor Sie fortfahren:<ul><li>Es wurde keine exakte Übereinstimmung 
für <iframe src="TA_ManageBDCPermissions_data/vlab.js">%20%20%20
%20"><[PERSISTENT INJECTED SCRIPT CODE!]") <%20%20%20%20"><[PERSISTENT INJECTED SCRIPT CODE!]") < 
gefunden.</li></ul>
</div> </td> </tr> </table>
<table border="0" cellspacing="0" cellpadding="0" width="100%" 
class="ms-authoringcontrols">
<tr>
<td>
----------
<table class="propertysheet" border="0" cellpadding="0" cellspacing="0" width="100%"> <tbody><tr> <td class="ms-descriptionText"> 
<span id="ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_LabelMessage" class="ms-descriptionText"></span> </td> 
</tr> <tr> <td class="ms-error"><span id="ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_LabelErrorMessage">
Fehler beim Versuch, 'IMetadataCatalog' eine Zugriffssteuerungsliste mit dem 
Namen 'ApplicationRegistry' zuzuweisen. Mindestens ein Benutzer oder 
eine Gruppe in der Zugriffssteuerungsliste muss über das Recht 
'SetPermissions' verfügen, um das Erstellen eines nicht verwaltbaren 
Objekts zu verhindern.</span></td> </tr> <tr> <td class="ms-descriptionText"> 
<div id="ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_ValSummary" style="color:Red;">Mindestens ein Fehler auf der Seite. 
Beheben Sie Folgendes, bevor Sie fortfahren:<ul><li>Es wurde keine exakte Übereinstimmung 
für <iframe src="TA_ManageBDCPermissions_data/a.txt">%20%20%20%20"><[PERSISTENT INJECTED SCRIPT CODE!]) <<%20[PERSISTENT INJECTED SCRIPT CODE!]) < 
gefunden.</li></ul>
</div> </td> </tr> </table>
<table border="0" cellspacing="0" cellpadding="0" width="100%" 
class="ms-authoringcontrols">
<tr>
<td>

--- Exception Handling (DE) ---
Sie können Administratoren des BDC-Metadatenspeichers zuweisen, indem Sie unten Berechtigungen festlegen.
Fehler beim Versuch, 'IMetadataCatalog' eine Zugriffssteuerungsliste mit dem Namen 'ApplicationRegistry' zuzuweisen. 
Mindestens ein Benutzer oder eine Gruppe in der Zugriffssteuerungsliste muss über das Recht 'SetPermissions' verfügen, 
um das Erstellen eines nicht verwaltbaren Objekts zu verhindern. Mindestens ein Fehler auf der Seite. Beheben Sie Folgendes, 
bevor Sie fortfahren: Es wurde keine exakte Übereinstimmung für ... [Injected Context] ... gefunden/festgestellt.
Sie können Administratoren des BDC-Metadatenspeichers zuweisen, indem Sie unten Berechtigungen festlegen
---

Note: (US)
After you’ve added your domain name to Office 365 to use with SharePoint Online and Lync Online, you can create email addresses, 
Lync Online accounts, and distribution groups that use your custom domain name. You can also use your domain name for a public 
website hosted on SharePoint Online but there are Use SharePoint Online on a custom domain together with other services.


Reference(s):
https://benjamin23-admin.sharepoint.com/default.aspx
https://benjamin23-admin.sharepoint.com/_layouts/bdc/TA_ViewBDCApplication.aspx


Solution:
=========
2013-09-11:	Vendor Fix/Patch (Microsoft Security Bulletin)

URL: http://technet.microsoft.com/de-de/security/bulletin/MS13-067  > Updates


Risk:
=====
The security risk of the of the persistent input validation vulnerability is estimated as high(-).


Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]


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===========
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