-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS16-100: Security Update for
Secure Boot (3179577)
10 August 2016
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2016-3320
- --------------------------BEGIN INCLUDED TEXT--------------------
Microsoft Security Bulletin MS16-100: Security Update for Secure Boot
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow security feature bypass if an attacker installs an
affected boot manager and bypasses Windows security features.
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, and Windows
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)
 This update is only available via Windows Update.
 Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update
Secure Boot Security Feature Bypass Vulnerability - CVE-2016-3320
A security feature bypass vulnerability exists when Windows Secure Boot
improperly loads a boot manager 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. Furthermore, the attacker could bypass Secure Boot
Integrity Validation for BitLocker and Device Encryption security features.
To exploit the vulnerability, an attacker who has gained administrative
privileges or who has physical access to a target device could install an
affected boot manager.The security update addresses the vulnerability by
blacklisting affected boot managers.
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-2016-3320 No No
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to email@example.com
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----