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Category:   Application (Generic)  >   Microsoft Office Vendors:   Microsoft
Microsoft Office Flaws Let Remote Users Execute Arbitrary Code and Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1033803
SecurityTracker URL:  http://securitytracker.com/id/1033803
CVE Reference:   CVE-2015-2555, CVE-2015-2557, CVE-2015-2558, CVE-2015-6037   (Links to External Site)
Date:  Oct 13 2015
Impact:   Disclosure of authentication 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, 2013 RT, 2016; Office for Mac 2011, Office 2016 for Mac
Description:   Two vulnerabilities were reported in Microsoft Office. A remote user can cause arbitrary code to be executed on the target user's system. A remote user can conduct cross-site scripting attacks.

A remote user can create specially crafted content that, when loaded by the target user, will trigger a memory corruption error and execute arbitrary code on the target user's system [CVE-2015-2555, CVE-2015-2557, CVE-2015-2558].

The software does not properly filter HTML code from user-supplied input before displaying the input [CVE-2015-6037]. A remote user can cause arbitrary scripting code to be executed by the target user's browser. The code will run in the security context of an arbitrary 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.

The following Microsoft Office components are affected:

Microsoft Excel 2007, Microsoft Visio 2007
Microsoft Excel 2010, Microsoft Visio 2010
Microsoft Excel 2013, Microsoft Excel 2013 RT
Microsoft Excel 2016
Microsoft Excel for Mac 2011
Microsoft Excel 2016 for Mac
Microsoft Excel Viewer, Microsoft Office Compatibility Pack
Microsoft Office Web Apps Server 2013

kdot (via HP's Zero Day Initiative) and 3S Labs (via HP's Zero Day Initiative) reported these vulnerabilities.

Impact:   A remote user can create content that, when loaded by the target user, will execute arbitrary code on the target user's system.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with the target 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.

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:  UNIX (macOS/OS X), Windows (Any)

Message History:   None.


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