Microsoft Security Bulletin MS16-014 - Important

  • Article
  • 14 minutes to read

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

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

Version: 2.0

Executive Summary

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.

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 February bulletin summary.

**Operating System** [**Windows Elevation of Privilege Vulnerability - CVE-2016-0040**](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0040) [**DLL Loading Remote Code Execution Vulnerability - CVE-2016-0041**](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0041) [**Windows DLL Loading Remote Code Execution Vulnerability - CVE-2016-0042**](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0042) [**Windows DLL Loading Denial of Service Vulnerability – CVE-2016-0044**](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0044) [**Windows Kerberos Security Feature Bypass – CVE-2016-0049**](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0049) **Updates Replaced**\*
[Windows Vista Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=189d229e-ef47-44c8-84c9-63b0127759d3) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Vista Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=b25e14ef-ff9a-4b7e-9129-39f40ebc1a6f) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Vista Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=a663abd3-6363-46ec-bd2f-43706363ec51) (3126041) Not applicable Not applicable Not applicable Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows Vista x64 Edition Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=ad4adb51-2cfd-4489-8887-ec8c6cbfbac1) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Vista x64 Edition Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=9372a302-0cf1-441a-be6e-2695c64845df) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Vista x64 Edition Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=1ab93a1d-1a32-41ff-a3b0-87368bf9d5e0) (3126041) Not applicable Not applicable Not applicable Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
**Windows Server 2008**
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=bdb8e33a-3d88-4889-ae28-be2540c4bcb5) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=f81616bf-9415-412c-a447-f40933183406) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=04e159b4-580d-4b9f-8aa2-703355ed02a2) (3126041) Not applicable Not applicable Not applicable Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=08b3536b-71bf-4d37-b4e3-237601c06787) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=647e0566-f586-49fb-9c20-21beb312688c) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=9a9d00a0-c9bc-4d7c-8546-77d35cc30ce0) (3126041) Not applicable Not applicable Not applicable Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows Server 2008 for Itanium-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=ceb1b144-a32a-4f4e-a924-ed4b76286eeb) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 for Itanium-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=3fa1749b-b260-46d7-a46b-f73046ef9c78) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2008 for Itanium-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=382b732d-d331-49b0-8c6e-467c044f23a7) (3126041) Not applicable Not applicable Not applicable Not applicable **Important** Security Feature Bypass 3011780 in [MS14-068](http://go.microsoft.com/fwlink/?linkid=518109)
**Windows 7**
[Windows 7 for 32-bit Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=8268956d-a679-4139-9a5d-e42bfb1425bc) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows 7 for 32-bit Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=973c0869-21db-49d8-b833-ae8e8b2933b7) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows 7 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=58589c4c-2d98-4a59-9615-07471dabdb89) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows 7 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=04a6aeb3-96bc-4dc6-8bd9-d3fc3fba1069) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
**Windows Server 2008 R2**
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=f1efddc4-ba08-403a-94a2-e5ae00d04a4e) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=1d35c1e1-4060-49fe-ba5c-cec599badb4b) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2008 R2 for Itanium-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=24465c74-9d48-4fc8-9842-72537ed8e157) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 R2 for Itanium-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=b3694557-2884-48a4-a25d-e7b2efa08541) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
**Windows 8.1**
[Windows 8.1 for 32-bit Systems](https://www.microsoft.com/download/details.aspx?familyid=1a711479-5c29-47f8-9b7a-7e3409668fff) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable None
[Windows 8.1 for 32-bit Systems](https://www.microsoft.com/download/details.aspx?familyid=8d85253f-5def-4977-b564-f986af2ac9b0) (3126593) Not applicable Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows 8.1 for 32-bit Systems](https://www.microsoft.com/download/details.aspx?familyid=0307e9b5-4689-4df3-8e81-42e38a0fa21c) (3126041) Not applicable Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows 8.1 for 32-bit Systems](https://www.microsoft.com/download/details.aspx?familyid=630b6ee1-8caf-4913-b448-714f39033118) (3126434) Not applicable Not applicable Not applicable **Important** Denial of Service Not applicable None
[Windows 8.1 for x64-based Systems](https://www.microsoft.com/download/details.aspx?familyid=a6fbab67-827e-441a-a8e8-029ccf047e8b) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable None
[Windows 8.1 for x64-based Systems](https://www.microsoft.com/download/details.aspx?familyid=32284a61-d585-4080-b565-70c130dd20d1) (3126593) Not applicable Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows 8.1 for x64-based Systems](https://www.microsoft.com/download/details.aspx?familyid=4ff2b43c-b8af-4376-83c8-435790bf45ed) (3126041) Not applicable Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows 8.1 for x64-based Systems](https://www.microsoft.com/download/details.aspx?familyid=759c253f-41b4-4cac-98b9-fc8f0513821e) (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](https://www.microsoft.com/download/details.aspx?familyid=94d5b4e7-c123-4d87-b60d-687030b866fc) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable None
[Windows Server 2012](https://www.microsoft.com/download/details.aspx?familyid=a1ec11d3-bbbe-4a17-8dd4-ffa646511197) (3126593) Not applicable Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=ab4657b3-ef16-479c-8873-adb0bd82717a) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable None
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=e3d50579-2676-45a4-b222-fa219a667d29) (3126593) Not applicable Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=43ca8be3-1b77-4060-9647-85f7f2f891c3) (3126041) Not applicable Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=263371dd-797c-4cf2-8bf8-be963c0fb99a) (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](http://go.microsoft.com/fwlink/?linkid=718007)
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](https://support.microsoft.com/kb/3135174)[2] (3135174) Not applicable **Important**  Remote Code Execution **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass [3124266](https://support.microsoft.com/kb/3124266)
[Windows 10 for x64-based Systems](https://support.microsoft.com/kb/3135174)[2] (3135174) Not applicable **Important**  Remote Code Execution **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass [3124266](https://support.microsoft.com/kb/3124266)
[Windows 10 Version 1511 for 32-bit Systems](https://support.microsoft.com/kb/3135173)[2] (3135173) Not applicable **Important**  Remote Code Execution **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass [3124263](https://support.microsoft.com/kb/3124263)
[Windows 10 Version 1511 for x64-based Systems](https://support.microsoft.com/kb/3135173)[2] (3135173) Not applicable **Important**  Remote Code Execution **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass [3124263](https://support.microsoft.com/kb/3124263)
**Server Core installation option**
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=bdb8e33a-3d88-4889-ae28-be2540c4bcb5) (Server Core installation) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=f81616bf-9415-412c-a447-f40933183406) (Server Core installation) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=04e159b4-580d-4b9f-8aa2-703355ed02a2) (Server Core installation) (3126041) Not applicable Not applicable Not applicable Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=08b3536b-71bf-4d37-b4e3-237601c06787) (Server Core installation) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=647e0566-f586-49fb-9c20-21beb312688c) (Server Core installation) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=9a9d00a0-c9bc-4d7c-8546-77d35cc30ce0) (Server Core installation) (3126041) Not applicable Not applicable Not applicable Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=f1efddc4-ba08-403a-94a2-e5ae00d04a4e) (Server Core installation) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable 3121918 in [MS16-007](http://go.microsoft.com/fwlink/?linkid=718006)
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=1d35c1e1-4060-49fe-ba5c-cec599badb4b) (Server Core installation) (3126593) **Important**  Elevation of Privilege Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2012](https://www.microsoft.com/download/details.aspx?familyid=94d5b4e7-c123-4d87-b60d-687030b866fc) (Server Core installation) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable None
[Windows Server 2012](https://www.microsoft.com/download/details.aspx?familyid=a1ec11d3-bbbe-4a17-8dd4-ffa646511197) (Server Core installation) (3126593) Not applicable Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=ab4657b3-ef16-479c-8873-adb0bd82717a) (Server Core installation) (3126587) Not applicable **Important**  Remote Code Execution Not applicable Not applicable Not applicable None
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=e3d50579-2676-45a4-b222-fa219a667d29) (Server Core installation) (3126593) Not applicable Not applicable **Important**  Remote Code Execution Not applicable Not applicable 3121212 in [MS16-008](http://go.microsoft.com/fwlink/?linkid=718007)
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=43ca8be3-1b77-4060-9647-85f7f2f891c3) (Server Core installation) (3126041) Not applicable Not applicable **Important**  Remote Code Execution Not applicable **Important** Security Feature Bypass 3101246 in [MS15-122](http://go.microsoft.com/fwlink/?linkid=690720)
[1]This update is only available via [Windows Update](http://go.microsoft.com/fwlink/?linkid=21130).

[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).

Update FAQ

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.

Vulnerability Information

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](https://technet.microsoft.com/library/security/dn848375.aspx) for this vulnerability. ### Workarounds Microsoft has not identified any [workarounds](https://technet.microsoft.com/library/security/dn848375.aspx) 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](https://technet.microsoft.com/library/security/dn848375.aspx) for these vulnerabilities. ### Workarounds Microsoft has not identified any [workarounds](https://technet.microsoft.com/library/security/dn848375.aspx) 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](https://technet.microsoft.com/library/security/dn848375.aspx) for this vulnerability. ### Workarounds Microsoft has not identified any [workarounds](https://technet.microsoft.com/library/security/dn848375.aspx) 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](https://technet.microsoft.com/library/security/dn848375.aspx) 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](https://technet.microsoft.com/library/security/dn848375.aspx) 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\
```
  1. Double click the "CachedLogonsCount" key
  2. 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"

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 (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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