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11 December 2013

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             AUSCERT External Security Bulletin Redistribution

                Update to Revoke Non-compliant UEFI Modules
                             11 December 2013


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows 8
                   Windows Server 2012
Impact/Access:     Reduced Security -- Unknown/Unspecified
Resolution:        Patch/Upgrade

Original Bulletin: 

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Microsoft Security Advisory (2871690) 

Update to Revoke Non-compliant UEFI Modules

Published: Tuesday, December 10, 2013

Version: 1.0 General Information Executive Summary

Microsoft is announcing the availability of an update for Windows 8 and 
Windows Server 2012 that revokes the digital signatures for nine private, 
third-party UEFI (Unified Extensible Firmware Interface) modules that could be
loaded during UEFI Secure Boot. When the update is applied, the affected UEFI
modules will no longer be trusted and will no longer load on systems where 
UEFI Secure Boot is enabled. The affected UEFI modules consist of specific 
Microsoft-signed modules that are either not in compliance with our 
certification program or their authors have requested that the packages be 
revoked. At the time of this release, these UEFI modules are not known to be 
available publicly.

Microsoft is not aware of any misuse of the affected UEFI modules. Microsoft 
is proactively revoking these non-compliant modules as part of ongoing efforts
to protect customers. This action only affects systems running Windows 8 and 
Windows Server 2012 that are capable of UEFI Secure Boot where the system is 
configured to boot via UEFI and Secure Boot is enabled. There is no action on
systems that do not support UEFI Secure Boot or where it is disabled.

Affected Software

This advisory discusses the following software.

Operating System

Windows 8 for 32-bit Systems
Windows 8 for 64-bit Systems
Windows Server 2012

Server Core installation option

Windows Server 2012 (Server Core installation)

Suggested Actions

Apply the update for affected releases of Microsoft Windows

Warning Customers who apply this update on a system that is using one of the 
affected UEFI modules risk delivering the system into a non-bootable state. 
Microsoft recommends that all customers apply this update after ensuring they
are running up-to-date UEFI modules. Customers with concern that they may be 
using an affected UEFI module should consult the "What does this update do?" 
advisory FAQ for a list of affected UEFI modules.

Microsoft recommends that customers apply the update at the earliest 
opportunity after ensuring that their systems are not using any of the 
affected UEFI modules. The update is available through Microsoft Update. In 
addition, the update is available on the Download Center as well as the 
Microsoft Update Catalog for Windows 8 and Windows Server 2012.

Download links for this update can be found in Microsoft Knowledge Base 
Article 2871690.

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