Microsoft Security Bulletin MS17-021 - Important

Security Update for Windows DirectShow (4010318)

Published: March 14, 2017 | Updated: April 11, 2017

Version: 2.0

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow an information disclosure if Windows DirectShow opens specially crafted media content that is hosted on a malicious website. An attacker who successfully exploited the vulnerability could obtain information to further compromise a target system.

This security update is rated Important for all affected versions of Windows. For more information, see the Affected Software and Vulnerability Severity Ratings section.

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

For more information about this update, see Microsoft Knowledge Base Article 4010318.

Affected Software

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.

Note Please see the Security Update Guide for a new approach to consuming the security update information. You can customize your views and create affected software spreadsheets, as well as download data via a restful API. For more information, please see the Security Updates Guide FAQ. As a reminder, the Security Updates Guide will be replacing security bulletins. Please see our blog post, Furthering our commitment to security updates, for more details.

**Operating System** [**Windows DirectShow Information Disclosure Vulnerability - CVE-2017-0042**](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2017-0042) **Updates Replaced**
**Windows Vista**
[Windows Vista Service Pack 2](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb3214051) (3214051) **Important** Information Disclosure None
[Windows Vista x64 Edition Service Pack 2](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb3214051) (3214051) **Important** Information Disclosure None
**Windows Server 2008**
[Windows Server 2008 for 32-bit Systems Service Pack 2](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb3214051) (3214051) **Important** Information Disclosure None
[Windows Server 2008 for x64-based Systems Service Pack 2](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb3214051) (3214051) **Important** Information Disclosure None
[Windows Server 2008 for Itanium-based Systems Service Pack 2](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb3214051) (3214051) **Important** Information Disclosure None
**Windows 7**
[Windows 7 for 32-bit Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012212) (4012212) Security Only[1] **Important** Information Disclosure None
[Windows 7 for 32-bit Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012215) (4012215) Monthly Rollup[1] **Important** Information Disclosure [3212646](https://support.microsoft.com/kb/3212646)
[Windows 7 for x64-based Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012212) (4012212) Security Only[1] **Important** Information Disclosure None
[Windows 7 for x64-based Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012215) (4012215) Monthly Rollup[1] **Important** Information Disclosure [3212646](https://support.microsoft.com/kb/3212646)
**Windows Server 2008 R2**
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012212) (4012212) Security Only[1] **Important** Information Disclosure None
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012215) (4012215) Monthly Rollup[1] **Important** Information Disclosure [3212646](https://support.microsoft.com/kb/3212646)
[Windows Server 2008 R2 for Itanium-based Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012212) (4012212) Security Only[1] **Important** Information Disclosure None
[Windows Server 2008 R2 for Itanium-based Systems Service Pack 1](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012215) (4012215) Monthly Rollup[1] **Important** Information Disclosure [3212646](https://support.microsoft.com/kb/3212646)
**Windows 8.1**
[Windows 8.1 for 32-bit Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012213) (4012213) Security Only[1] **Important** Information Disclosure None
[Windows 8.1 for 32-bit Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012216) (4012216) Monthly Rollup[1] **Important** Information Disclosure [3205401](https://support.microsoft.com/kb/3205401)
[Windows 8.1 for x64-based Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012213) (4012213) Security Only[1] **Important** Information Disclosure None
[Windows 8.1 for x64-based Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012216) (4012216) Monthly Rollup[1] **Important** Information Disclosure [3205401](https://support.microsoft.com/kb/3205401)
**Windows Server 2012 and Windows Server 2012 R2**
[Windows Server 2012](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4015548) (4015548) Security Only[1]\[4\] **Important** Information Disclosure None
[Windows Server 2012](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4015551) (4015551) Monthly Rollup[1]\[4\] **Important** Information Disclosure [4012217](https://support.microsoft.com/kb/4012217)
[Windows Server 2012 R2](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012213) (4012213) Security Only[1] **Important** Information Disclosure None
[Windows Server 2012 R2](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012216) (4012216) Monthly Rollup[1] **Important** Information Disclosure [3205401](https://support.microsoft.com/kb/3205401)
**Windows RT 8.1**
Windows RT 8.1[2] (4012216) Monthly Rollup **Important** Information Disclosure [3205401](https://support.microsoft.com/kb/3205401)
**Windows 10**
[Windows 10 for 32-bit Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012606)[3] (4012606) **Important** Information Disclosure [3210720](https://support.microsoft.com/en-us/kb/3210720)
[Windows 10 for x64-based Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4012606)[3] (4012606) **Important** Information Disclosure [3210720](https://support.microsoft.com/en-us/kb/3210720)
[Windows 10 Version 1511 for 32-bit Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4013198)[3] (4013198) **Important** Information Disclosure [3210721](https://support.microsoft.com/en-us/kb/3210721)
[Windows 10 Version 1511 for x64-based Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4013198)[3] (4013198) **Important** Information Disclosure [3210721](https://support.microsoft.com/en-us/kb/3210721)
[Windows 10 Version 1607 for 32-bit Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4013429)[3] (4013429) **Important** Information Disclosure [3213986](https://support.microsoft.com/en-us/kb/3213986)
[Windows 10 Version 1607 for x64-based Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4013429)[3] (4013429) **Important** Information Disclosure [3213986](https://support.microsoft.com/en-us/kb/3213986)
**Windows Server 2016**
[Windows Server 2016 for x64-based Systems](http://catalog.update.microsoft.com/v7/site/search.aspx?q=kb4013429)[3] (4013429) **Important** Information Disclosure [3213986](https://support.microsoft.com/en-us/kb/3213986)

[1]Beginning with the October 2016 release, Microsoft has changed the update servicing model for Windows 7, Windows Server 2008 R2, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2. For more information, please see this Microsoft TechNet article.

[2]This update is only available via Windows Update.

[3]Windows 10 and Windows Server 2016 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 Catalog. Please note that effective December 13, 2016, Windows 10 and Windows Server 2016 details for the Cumulative Updates will be documented in Release Notes. Please refer to the Release Notes for OS Build numbers, Known Issues, and affected file list information.

[4]Effective April 11, 2017, the security updates that apply to CVE-2017-0042 for Windows Server 2012 are now available. Customers running Windows Server 2012 should install update 4015548 (Security Only) or 4015551 (Monthly Rollup) to be fully protected from this vulnerability.

*The Updates Replaced column shows only the latest update in a 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 on the Package Details tab).

Vulnerability Information

Windows DirectShow Information Disclosure Vulnerability - CVE-2017-0042

An information disclosure vulnerability exists when Windows DirectShow handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise a target system.

In a web-based attack scenario, an attacker could host a website used to attempt to exploit the vulnerability. Additionally, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could be used to exploit the vulnerability. However, in all cases, an attacker would have no way to force users to view attacker-controlled content. Instead, an attacker would have to convince users to take action. For example, an attacker could trick users into clicking a link that takes them to the attacker's site.

The security update addresses the vulnerability by correcting how Windows DirectShow handles objects in memory.

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**
Windows DirectShow Information Disclosure Vulnerability [CVE-2017-0042](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2017-0042) No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

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 (March 14, 2017): Bulletin published.
  • V2.0 (April 11, 2017): Bulletin revised to announce that the security updates that apply to CVE-2017-0042 for Windows Server 2012 are now available. Customers running Windows Server 2012 should install update 4015548 (Security Only) or 4015551 (Monthly Rollup) to be fully protected from this vulnerability. Customers running other versions of Microsoft Windows do not need to take any further action.

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