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Category:   OS (Microsoft)  >   Windows DLL (Any) Vendors:   Microsoft
Microsoft Windows Secure Boot Bug in Loading Boot Managers Lets Local Users
SecurityTracker Alert ID:  1036573
SecurityTracker URL:  http://securitytracker.com/id/1036573
CVE Reference:   CVE-2016-3320   (Links to External Site)
Date:  Aug 9 2016
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.1, RT 8.1, 2012 R2, 10, 10 Version 1511
Description:   A vulnerability was reported in Microsoft Windows Secure Boot. A local user can bypass security restrictions.

A local administrative user or a physically local user can cause Windows Secure Boot to load a vulnerable boot manager and bypass Secure Boot Integrity Validation for BitLocker and Device Encryption security integrity checks. As a result, test-signed executable code and drivers can be loaded on the target system.

Impact:   A local user can bypass security controls to load test-signed executable code and drivers on the target system.
Solution:   The vendor has issued a fix.

Windows 8.1 for 32-bit Systems:

https://www.microsoft.com/downloads/details.aspx?familyid=19c5ba0d-de7b-41af-8db3-76d1ff6f79b2

Windows 8.1 for x64-based Systems:

https://www.microsoft.com/downloads/details.aspx?familyid=e0aedb91-f808-4ae8-86f4-46015f6b7c0b

Windows Server 2012:

https://www.microsoft.com/downloads/details.aspx?familyid=224b85dd-5caf-4c9f-852f-88f2542f9a94

Windows Server 2012 R2:

https://www.microsoft.com/downloads/details.aspx?familyid=14f74104-ff9e-4fe6-8bd0-2b749afb3171

Fixes are also available for Windows 10.

The Microsoft advisory is available at:

https://technet.microsoft.com/library/security/ms16-100

Vendor URL:  technet.microsoft.com/library/security/ms16-100 (Links to External Site)
Cause:   Access control error

Message History:   None.


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