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             AUSCERT External Security Bulletin Redistribution

         Microsoft Security Bulletin MS16-100: Security Update for
                           Secure Boot (3179577)
                              10 August 2016


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-3320  

Original Bulletin: 

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Microsoft Security Bulletin MS16-100: Security Update for Secure Boot 

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The 
vulnerability could allow security feature bypass if an attacker installs an 
affected boot manager and bypasses Windows security features.

This security update is rated Important for all supported editions of Windows
8.1, Windows Server 2012, Windows Server 2012 R2, Windows RT 8.1, and Windows

Affected Software

Windows 8.1

Windows Server 2012

Windows Server 2012 R2

Windows RT 8.1 [1]

Windows 10 [2]

Windows Server 2012 (Server Core installation)

Windows Server 2012 R2 (Server Core installation)

[1] This update is only available via Windows Update.
[2] Windows 10 updates are cumulative. The monthly security release includes 
all security fixes for vulnerabilities that affect Windows 10, in addition to 
non-security updates. The updates are available via the Microsoft Update 

Vulnerability Information

Secure Boot Security Feature Bypass Vulnerability - CVE-2016-3320

A security feature bypass vulnerability exists when Windows Secure Boot 
improperly loads a boot manager that is affected by the vulnerability. An 
attacker who successfully exploited this vulnerability could disable code 
integrity checks, allowing test-signed executables and drivers to be loaded 
onto a target device. Furthermore, the attacker could bypass Secure Boot 
Integrity Validation for BitLocker and Device Encryption security features.

To exploit the vulnerability, an attacker who has gained administrative 
privileges or who has physical access to a target device could install an 
affected boot manager.The security update addresses the vulnerability by 
blacklisting affected boot managers.

The following table contains links to the standard entry for each 
vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title 					CVE number 	Publicly disclosed 	Exploited

Secure Boot Security Feature Bypass Vulnerability 	CVE-2016-3320 	No 			No

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