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AUSCERT External Security Bulletin Redistribution
ESB-2016.1723
MS16-094 - Important: Security Update for Secure Boot (3177404)
13 July 2016
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AusCERT Security Bulletin Summary
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Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows 8.1
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1
Windows 10
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3287
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-094
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Microsoft Security Bulletin MS16-094 - Important
Security Update for Secure Boot (3177404)
Published: July 12, 2016
Version: 1.0
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow Secure Boot security features to be bypassed if an
attacker installs an affected policy on a target device. An attacker must have
either administrative privileges or physical access to install a policy and
bypass Secure Boot.
This security update is rated Important for all supported editions of Windows
8.1, Windows RT 8.1, Windows Server 2012, Windows Server 2012 R2, and Windows
10.
Affected Software
Windows 8.1
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1
Windows 10
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
Vulnerability Information
Secure Boot Security Feature Bypass Vulnerability CVE-2016-3287
A security feature bypass vulnerability exists when Windows Secure Boot
improperly applies an affected policy. An attacker who successfully exploited
this vulnerability could disable code integrity checks, allowing test-signed
executables and drivers to be loaded on a target device. In addition, an
attacker could bypass the Secure Boot Integrity Validation for BitLocker and
the Device Encryption security features.
To exploit the vulnerability, an attacker must either gain administrative
privileges or physical access to a target device to install an affected
policy. The security update addresses the vulnerability by blacklisting
affected policies.
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-2016-3287 Yes No
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