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Category:   Application (Generic)  >   Microsoft SharePoint Vendors:   Microsoft
Microsoft SharePoint Input Validation and Access Control Flaws Let Remote Users Conduct Cross-Site Scripting Attacks and Remote Authenticated Users View Arbitrary Files
SecurityTracker Alert ID:  1033804
SecurityTracker URL:  http://securitytracker.com/id/1033804
CVE Reference:   CVE-2015-2556, CVE-2015-6037, CVE-2015-6039   (Links to External Site)
Date:  Oct 13 2015
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2007, 2010, 2013; Office Web Apps 2010, 2013
Description:   Multiple vulnerabilities were reported in Microsoft SharePoint. A remote user can conduct cross-site scripting attacks. A remote authenticated user can conduct XML DTD attacks to obtain files on the target system.

The Office Web Apps Server [CVE-2015-6037] and Office Marketplace [CVE-2015-6039] does not properly filter HTML code from user-supplied input before displaying the input. A remote user can cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Office Web Apps Server and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A remote authenticated user with write permissions on the target site can supply specially crafted XML DTD file to the target interface to read files on the target system with the privileges of the target service [CVE-2015-2556]. Systems with InfoPath Services enabled are affected.

The following Microsoft SharePoint components are affected:

Excel Services on Microsoft SharePoint Server 2007
Excel Services on Microsoft SharePoint Server 2010, Microsoft Web App 2010, Microsoft Excel Web App 2010
Excel Services on Microsoft SharePoint Server 2013, Microsoft Office Web Apps Server 2013
Microsoft SharePoint Server 2007
Microsoft SharePoint Server 2010
Microsoft SharePoint Server 2013, Microsoft SharePoint Foundation 2013

Jakub Palaczynski of ING Services Polska reported the information disclosure vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Office Web Apps Server or Office Marketplace software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A remote user can read files on the target system with the privileges of the target service.

Solution:   The vendor has issued a fix.

The Microsoft advisory is available at:

https://technet.microsoft.com/library/security/ms15-110

Vendor URL:  technet.microsoft.com/library/security/ms15-110 (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (2008), Windows (2012)

Message History:   None.


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