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             AUSCERT External Security Bulletin Redistribution

         Microsoft Security Bulletin MS16-140 - Important Security
                     Update for Boot Manager (3193479)
                              9 November 2016


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows 8.1
                   Windows Server 2012
                   Windows Server 2012 R2
                   Windows RT 8.1
                   Windows 10
                   Windows Server 2016
Impact/Access:     Reduced Security -- Unknown/Unspecified
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-7247  

Original Bulletin: 

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Microsoft Security Bulletin MS16-140 - Important
Security Update for Boot Manager (3193479)

Published: November 8, 2016

Version: 1.0

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow security feature bypass if a physically-present
attacker installs an affected boot policy.

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,
Windows 10, and Windows Server 2016.

Affected Software

Windows 8.1
Windows Server 2012 and Windows Server 2012 R2
Windows RT 8.1
Windows 10
Windows Server 2016

Vulnerability Information
Secure Boot Component Vulnerability – CVE-2016-7247

A security feature bypass vulnerability exists when Windows Secure Boot
improperly loads a boot policy 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.

The security update addresses the vulnerability by revoking affected boot
policies in the firmware. The revocation protection level depends upon
platform firmware. The Windows event channel Microsoft-Windows-Kernel-Boot
may be used to determine the protection level provided. Note that an
additional reboot is needed to view the event:

Windows versions prior to Windows 10 do not log the event by default. You
must enable “analytic” logging for this channel prior to installation
of the patch.

Windows versions 10 and higher log the event by default. Event ID 155
indicates baseline protection. Event ID 154 indicates enhanced protection.

For systems that provide baseline protection, firmware updates from your OEM
may be available which upgrade systems to enhanced protection. 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 Component Vulnerability	CVE-2016-7247	No			No

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