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AUSCERT External Security Bulletin Redistribution
ESB-2013.1780
Update to Revoke Non-compliant UEFI Modules
11 December 2013
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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:
http://technet.microsoft.com/en-us/security/advisory/2871690
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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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The University of Queensland
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