Microsoft Security Bulletin MS16-067 - Important

Security Update for Volume Manager Driver (3155784)

Published: May 10, 2016 | Updated: May 13, 2016

Version: 1.1

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow information disclosure if a USB disk mounted over Remote Desktop Protocol (RDP) via Microsoft RemoteFX is not correctly tied to the session of the mounting user.

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

The security update addresses the vulnerability by ensuring that access to USB disks over RDP is correctly enforced to prevent non-mounting session access. For more information about the vulnerability, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3155784.

Affected Software and Vulnerability Severity Ratings

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 May bulletin summary.

Operating System Remote Desktop Protocol Drive Redirection Information Disclosure Vulnerability - CVE-2016-0190

Updates Replaced*

Windows 8.1

Windows 8.1 for 32-bit Systems
(3155784)
Not applicable None
Windows 8.1 for x64-based Systems
(3155784)
Not applicable None
Windows Server 2012 and Windows Server 2012 R2
Windows Server 2012
(3155784)
Important
Information Disclosure
None
Windows Server 2012 R2
(3155784)
Important
Information Disclosure
None
Windows RT 8.1
Windows RT 8.1[1] (3155784) Not applicable None
Server Core installation option
Windows Server 2012 (Server Core installation)
(3155784)
Important
Information Disclosure
None
Windows Server 2012 R2 (Server Core installation)
(3155784)
Important
Information Disclosure
None

[1]Windows RT 8.1 updates are available only via Windows Update.

Note Windows Server 2016 Technical Preview 5 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).

Vulnerability Information

Remote Desktop Protocol Drive Redirection Information Disclosure Vulnerability - CVE-2016-0190

An information disclosure vulnerability exists in Microsoft Windows when a USB disk mounted over Remote Desktop Protocol (RDP) via Microsoft RemoteFX is not correctly tied to the session of the mounting user. An attacker who successfully exploited this vulnerability could obtain access to file and directory information on the mounting user’s USB disk. This update addresses the vulnerability by ensuring that access to USB disks over RDP is correctly enforced to prevent non-mounting session access.

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
Remote Desktop Protocol Drive Redirection Information Disclosure Vulnerability CVE-2016-0190 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Security Update Deployment

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

Acknowledgments

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

Disclaimer

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.

Revisions

  • V1.0 (May 10, 2016): Bulletin published.
  • V1.1 (May 13, 2016): Bulletin revised to change the vulnerability severity rating for Windows 8.1 and Windows RT 8.1 to Not applicable, because these operating systems are not affected by the vulnerability described in this bulletin. Customers who have applied security update 3155784 do not need to take any further action. This is an informational change only.

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