Microsoft Security Bulletin MS16-033 - Important

Security Update for Windows USB Mass Storage Class Driver to Address Elevation of Privilege (3143142)

Published: March 8, 2016 | Updated: April 12, 2016

Version: 2.0

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker with physical access inserts a specially crafted USB device into the system.

This security update is rated Important for all supported editions of Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, Windows Server 2012, Windows 8.1, Windows Server 2012 R2, Windows RT 8.1, and Windows 10. For more information, see the Affected Software section.

The security update addresses the vulnerability by correcting how Windows handles objects in memory. For more information about the vulnerabilities, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3143142.

The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.

The severity ratings indicated for each affected software assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin’s release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the March bulletin summary.

Operating System

USB Mass Storage Elevation of Privilege Vulnerability - CVE-2016-0133

Updates Replaced*

Windows Vista

Windows Vista Service Pack 2
(3139398)

Important 
Elevation of Privilege

None

Windows Vista x64 Edition Service Pack 2
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2008 for x64-based Systems Service Pack 2
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2008 for Itanium-based Systems Service Pack 2
(3139398)

Important 
Elevation of Privilege

None

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
(3139398)

Important 
Elevation of Privilege

None

Windows 7 for x64-based Systems Service Pack 1
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3139398)

Important 
Elevation of Privilege

None

Windows 8.1

Windows 8.1 for 32-bit Systems
(3139398)

Important 
Elevation of Privilege

None

Windows 8.1 for x64-based Systems
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2012 R2
(3139398)

Important 
Elevation of Privilege

None

Windows RT 8.1

Windows RT 8.1[1]
(3139398)

Important 
Elevation of Privilege

None

Windows 10

Windows 10 for 32-bit Systems [2]
(3140745)

Important 
Elevation of Privilege

3135174

Windows 10 for x64-based Systems [2]
(3140745)

Important 
Elevation of Privilege

3135174

Windows 10 Version 1511 for 32-bit Systems [2]
(3140768)

Important 
Elevation of Privilege

3140743

Windows 10 Version 1511 for x64-based Systems [2]
(3140768)

Important 
Elevation of Privilege

3140743

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2012 (Server Core installation)
(3139398)

Important 
Elevation of Privilege

None

Windows Server 2012 R2 (Server Core installation)
(3139398)

Important 
Elevation of Privilege

None

[1]This update is available via Windows Update.

[2]Windows 10 updates are cumulative. In addition to containing non-security updates, they also contain all of the security fixes for all of the Windows 10-affected vulnerabilities shipping with the monthly security release. The update is available via the Windows Update Catalog.

Note Windows Server Technical Preview 4 is affected. Customers running this operating system are encouraged to apply the update, which is available via Windows Update.

*The Updates Replaced column shows only the latest update in any chain of superseded updates. For a comprehensive list of updates replaced, go to the Microsoft Update Catalog, search for the update KB number, and then view update details (updates replaced information is provided on the Package Details tab).

USB Mass Storage Elevation of Privilege Vulnerability-CVE-2016-0133

This security update resolves an elevation of privilege vulnerability in Microsoft Windows when the Windows USB Mass Storage Class driver fails to properly validate objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To exploit this vulnerability, an attacker would first have to have physical access to the system. An attacker could then insert a specially crafted USB device that could exploit the vulnerability and take control of an affected system. The update addresses this vulnerability by correcting how the Windows USB Mass Storage Class driver handles objects in memory.

The following table contains a link to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability Title

CVE number

Publicly disclosed

Exploited

USB Mass Storage Elevation of Privilege Vulnerability

CVE-2016-0133

No

No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

For Security Update Deployment information, see the Microsoft Knowledge Base article referenced here in the Executive Summary.

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information.

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

  • V1.0 (March 8, 2016): Bulletin published.
  • V2.0: (April 12, 2016) To comprehensively address CVE-2016-0133, Microsoft is releasing April Windows 10 Cumulative Update. Microsoft recommends that customers running affected versions of Microsoft Windows 10 (update 3140745) should install update 3147461. See Microsoft Knowledge Base Article 3140745 for more information.
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