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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
Operating System: Windows 8.1
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1
Windows Server 2016
Impact/Access: Reduced Security -- Unknown/Unspecified
CVE Names: CVE-2016-7247
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Microsoft Security Bulletin MS16-140 - Important
Security Update for Boot Manager (3193479)
Published: November 8, 2016
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.
Windows Server 2012 and Windows Server 2012 R2
Windows RT 8.1
Windows Server 2016
Secure Boot Component Vulnerability Ã¢Â€Â“ 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 Ã¢Â€ÂœanalyticÃ¢Â€Â 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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