Microsoft Security Bulletin MS16-130 - Critical

Published: November 8, 2016 | Updated: December 13, 2016

Version: 2.0

This security update resolves vulnerabilities in Microsoft Windows. The most severe of the vulnerabilities could allow remote code execution if a locally authenticated attacker runs a specially crafted application.

This security update is rated Critical for all supported releases of Microsoft Windows. For more information, see the Affected Software and Vulnerability Severity Ratings section.

The security update addresses the vulnerabilities by:

• Correcting how the Windows Input Method Editor (IME) loads DLLs.
• Requiring hardened UNC paths be used in scheduled tasks.

For more information about the vulnerabilities, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3199172.

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 November bulletin summary.

^[1]This update is only available via Windows Update.

^[2]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 Catalog.

^[3]Beginning with the October 2016 release, Microsoft is changing 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.

*The Updates Replaced column shows only the latest update in any chain of superseded updates.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).

Note A vulnerability discussed in this bulletin affects Windows Server 2016 Technical Preview 5. To be protected from the vulnerability, Microsoft recommends that customers running this operating system apply the current update, which is available from Windows Update. 

An elevation of privilege vulnerability exists in Windows when Windows Input Method Editor (IME) improperly handles DLL loading. There is no impact without IME present. 

To exploit this vulnerability, a locally authenticated attacker could run a specially crafted application.

The update addresses this vulnerability by correcting how the Windows Input Method Editor (IME) loads DLLs.

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

Microsoft has not identified any mitigating factor for this vulnerability.

Microsoft has not identified any workarounds for this vulnerability.

An elevation of privilege vulnerability exists in Task Scheduler when a user creates a task that uses UNC paths. An attacker who successfully exploited this vulnerability could run arbitrary code with elevated system privileges.

To exploit the vulnerability, a locally authenticated attacker could use Windows Task Scheduler to schedule a new task with a specially crafted UNC path.

This security update addresses the vulnerability by correcting how Task Scheduler handles specially crafted UNC paths.

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

Microsoft has identified the following mitigating factors for this vulnerability.

• An enterprise perimeter firewall can be used to prevent this type of attack. See Knowledge Base Article 3185535 for guidance on configuring an enterprise perimeter firewall.

Microsoft has not identified any workarounds for this vulnerability.

A remote code execution vulnerability exists when Windows image file loading functionality does not properly handle malformed image files. An attacker who successfully exploited the vulnerability could execute arbitrary code.

To exploit the vulnerability, an attacker would have to convince a user to load a malformed image file from either a webpage or an email message.

The update addresses the vulnerability by helping to ensure that image files contents are properly validated.

Microsoft has not identified any mitigating factor for this vulnerability.

Microsoft has not identified any workarounds for this vulnerability.

For Security Update Deployment information, see the Microsoft Knowledge Base article referenced 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 (November 8, 2016): Bulletin published.
• V1.1 (November 23, 2016): Updated the vulnerability description for CVE-2016-7222. This is an informational change only.
• V2.0 (December 13, 2016): Revised bulletin to announce the following updates have been rereleased with a detection change that addresses a supersedence issue that certain customers experienced when attempting to install the November Security Only updates.
  • Security Only update 3197867 for all supported releases of Windows 7 and Windows Server 2008 R2. For more information, see Microsoft Knowledge Base Article 3197867.
  • Monthly Rollup 3197868 for all supported releases of Windows 7 and Windows Server 2008 R2. For more information, see Microsoft Knowledge Base Article 3197868.
  • Security Only update 3197876 for Windows Server 2012. For more information, see Microsoft Knowledge Base Article 3197876.
  • Monthly Rollup 3197877 for Windows Server 2012. For more information, see Microsoft Knowledge Base Article 3197877.
  • Security Only update 3197873 for Windows 8.1 and Windows Server 2012 R2. For more information, see Microsoft Knowledge Base Article 3197873.
  • Monthly Rollup 3197874 for Windows 8.1 and Windows Server 2012 R2. For more information, see Microsoft Knowledge Base Article 3197874.
• These are detection changes only. There were no changes to the update files. Customers who have already successfully installed any of these updates do not need to take any action. For more information, see the Microsoft Knowledge Base article for the respective update

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