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Microsoft Security Bulletin MS16-014 - Important

Security Update for Microsoft Windows to Address Remote Code Execution (3134228)

Published: February 9, 2016 | Updated: February 10, 2016

Version: 2.0

This security update resolves vulnerabilities in Microsoft Windows. The most severe of the vulnerabilities could allow remote code execution if an attacker is able to log on to a target system and run a specially crafted application.

This security update is rated Important for all supported releases of Microsoft Windows. For more information, see the Affected Software section.

The security update addresses the vulnerabilities by:

  • Correcting how the Windows kernel handles objects in memory
  • Correcting how Windows validates input before loading DLL files
  • Correcting how Microsoft Sync Framework validates input
  • Adding an additional authentication check

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

For more information about this update, see Microsoft Knowledge Base Article 3134228.

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 February bulletin summary.

Operating System

Windows Elevation of Privilege Vulnerability - CVE-2016-0040

DLL Loading Remote Code Execution Vulnerability - CVE-2016-0041

Windows DLL Loading Remote Code Execution Vulnerability - CVE-2016-0042

Windows DLL Loading Denial of Service Vulnerability – CVE-2016-0044

Windows Kerberos Security Feature Bypass – CVE-2016-0049

Updates Replaced*         

Windows Vista

Windows Vista Service Pack 2
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Vista Service Pack 2
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Vista Service Pack 2
(3126041)

Not applicable

Not applicable

Not applicable

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows Vista x64 Edition Service Pack 2
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Vista x64 Edition Service Pack 2
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Vista x64 Edition Service Pack 2
(3126041)

Not applicable

Not applicable

Not applicable

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 for 32-bit Systems Service Pack 2
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Server 2008 for 32-bit Systems Service Pack 2
(3126041)

Not applicable

Not applicable

Not applicable

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows Server 2008 for x64-based Systems Service Pack 2
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 for x64-based Systems Service Pack 2
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Server 2008 for x64-based Systems Service Pack 2
(3126041)

Not applicable

Not applicable

Not applicable

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows Server 2008 for Itanium-based Systems Service Pack 2
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 for Itanium-based Systems Service Pack 2
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Server 2008 for Itanium-based Systems Service Pack 2
(3126041)

Not applicable

Not applicable

Not applicable

Not applicable

Important
Security Feature Bypass

3011780 in MS14-068

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows 7 for 32-bit Systems Service Pack 1
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3121212 in MS16-008

Windows 7 for x64-based Systems Service Pack 1
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows 7 for x64-based Systems Service Pack 1
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3121212 in MS16-008

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3121212 in MS16-008

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3121212 in MS16-008

Windows 8.1

Windows 8.1 for 32-bit Systems
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

None

Windows 8.1 for 32-bit Systems
(3126593)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows 8.1 for 32-bit Systems
(3126041)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows 8.1 for 32-bit Systems
(3126434)

Not applicable

Not applicable

Not applicable

Important
Denial of Service

Not applicable

None

Windows 8.1 for x64-based Systems
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

None

Windows 8.1 for x64-based Systems
(3126593)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows 8.1 for x64-based Systems
(3126041)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows 8.1 for x64-based Systems
(3126434)

Not applicable

Not applicable

Not applicable

Important
Denial of Service

Not applicable

None

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

None

Windows Server 2012
(3126593)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3121212 in MS16-008

Windows Server 2012 R2
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

None

Windows Server 2012 R2
(3126593)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Server 2012 R2
(3126041)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows Server 2012 R2
(3126434)

Not applicable

Not applicable

Not applicable

Important
Denial of Service

Not applicable

None

Windows RT 8.1

Windows RT 8.1[1]
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

None

Windows RT 8.1[1]
(3126593)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows RT 8.1[1]
(3126434)

Not applicable

Not applicable

Not applicable

Important
Denial of Service

Not applicable

None

Windows 10

Windows 10 for 32-bit Systems [2]
(3135174)

Not applicable

Important 
Remote Code Execution

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3124266

Windows 10 for x64-based Systems [2]
(3135174)

Not applicable

Important 
Remote Code Execution

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3124266

Windows 10 Version 1511 for 32-bit Systems [2]
(3135173)

Not applicable

Important 
Remote Code Execution

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3124263

Windows 10 Version 1511 for x64-based Systems [2]
(3135173)

Not applicable

Important 
Remote Code Execution

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3124263

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3126041)

Not applicable

Not applicable

Not applicable

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3126041)

Not applicable

Not applicable

Not applicable

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

3121918 in MS16-007

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3126593)

Important 
Elevation of Privilege

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3121212 in MS16-008

Windows Server 2012 (Server Core installation)
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

None

Windows Server 2012 (Server Core installation)
(3126593)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3121212 in MS16-008

Windows Server 2012 R2 (Server Core installation)
(3126587)

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

Not applicable

None

Windows Server 2012 R2 (Server Core installation)
(3126593)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Not applicable

3121212 in MS16-008

Windows Server 2012 R2 (Server Core installation)
(3126041)

Not applicable

Not applicable

Important 
Remote Code Execution

Not applicable

Important
Security Feature Bypass

3101246 in MS15-122

[1]This update is only 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).

Does this update contain any additional security-related changes to functionality? 
In addition to the changes that are listed for the vulnerabilities described in this bulletin, this update includes defense-in-depth updates to help improve credential protection and domain authentication controls to reduce credential theft. For more information see Microsoft Security Advisory 2871997.

Windows Elevation of Privilege Vulnerability - CVE-2016-0040

An elevation of privilege vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited the 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 the vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerabilities and take control over an affected system. The update addresses the vulnerabilities by correcting how the Windows kernel handles objects in memory.

Vulnerability Title

CVE number

Publicly disclosed

Exploited

Windows Elevation of Privilege Vulnerability

CVE-2016-0040

Yes

No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Multiple DLL Loading Remote Code Execution Vulnerabilities

Multiple remote code execution vulnerabilities exist when Windows improperly validates input before loading dynamic link library (DLL) files. An attacker who successfully exploited these vulnerabilities could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

To exploit the vulnerabilities, an attacker would first have to log on to the target system and then run a specially crafted application. The updates address the vulnerabilities by correcting how Windows validates input before loading DLL files.

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

DLL Loading Remote Code Execution Vulnerability

CVE-2016-0041

No

No

Windows DLL Loading Remote Code Execution Vulnerability

CVE-2016-0042

No

No

Mitigating Factors

Microsoft has not identified any mitigating factors for these vulnerabilities.

Workarounds

Microsoft has not identified any workarounds for these vulnerabilities.

Windows DLL Loading Denial of Service Vulnerability – CVE-2016-0044

A denial of service vulnerability exists in Windows when Microsoft Sync Framework processes specially crafted input that uses the “change batch” structure. An attacker who successfully exploited the vulnerability could cause the target SyncShareSvc service to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate their user rights. However, it could prevent authenticated users from using the SyncShareSvc service.

To exploit the vulnerability an authenticated attacker must send a specially-crafted network packet to a server running the SyncShareSvc service. The update addresses the vulnerability by correcting how Microsoft Sync Framework validates input.

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 DLL Loading Denial of Service Vulnerability

CVE-2016-0044

No

No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Windows Kerberos Security Feature Bypass – CVE-2016-0049

A security feature bypass exists in Windows when Kerberos fails to check the password change of a user signing into a workstation. An attacker could bypass Kerberos authentication on a target machine and decrypt drives protected by BitLocker.

An attacker could bypass Kerberos authentication by connecting a workstation to a malicious Kerberos Key Distribution Center (KDC). The update addresses the bypass by adding an additional authentication check.

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 Kerberos Security Feature Bypass Vulnerability

CVE-2016-0049

No

No

Mitigating Factors

The following mitigating factors may be helpful in your situation.

  • A domain user must be logged on to the target machine for the attack to succeed.
  • This bypass can be exploited only if the target system has BitLocker enabled without a PIN or USB key.

Workarounds

The following workarounds may be helpful in your situation:

Disable Cashing of Domain Logon Information

Note Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or view the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe.

  1. Open Registry Editor
  2. Locate and then click the following registry sub key:
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version\Winlogon\
    
  3. Double click the "CachedLogonsCount" key
  4. Change the value to "0"

Impact of workaround. Domain users will not be able to log on if their device is not connected to the network.

How to undo the workaround

  1. Open Registry Editor
  2. Locate and then click the following registry sub key:
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version\Winlogon\
    
  3. Double click the "CachedLogonsCount" key
  4. Change the value to "10"

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 (February 9, 2016): Bulletin published.
  • V2.0 (February 10, 2016): Bulletin revised to announce the availability of update 3126041 for Microsoft Windows Vista, Windows Server 2008, Windows Server 2008 for Itanium-based Systems, Windows 8.1, and Windows Server 2012 R2. Customers should apply the applicable updates to be protected from the vulnerabilities discussed in this bulletin. The majority of customers have automatic updating enabled and will not need to take any action because the updates will be downloaded and installed automatically.

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