January 8, 2018 - KB4056895 (Monthly Rollup)
Applies to: Windows 8.1, Windows Server 2012 R2 Standard
Improvements and fixes
This security update includes improvements and fixes that were a part of update KB4054519 (released December 12, 2017) and addresses the following issues:
For more information about the resolved security vulnerabilities, see the Security Update Guide.
- Security updates to Windows Kernel, Windows Datacenter Networking, Windows Graphics, and Internet Explorer.
Known issues in this update
Symptom Workaround When calling CoInitializeSecurity, the call will fail if passing RPC_C_IMP_LEVEL_NONE under certain conditions.
When calling CoInitializeSecurity, the call may fail when passing RPC_C_AUTHN_LEVEL_NONE as the authentication level. The error returned on failure is STATUS_BAD_IMPERSONATION_LEVEL.
Change the authentication level parameter to RPC_C_AUTHN_LEVEL_CALL.
Microsoft is working on a resolution and will provide an update in an upcoming release.
Due to an issue with some versions of antivirus software, this fix only applies to machines where the antivirus ISV have updated the ALLOW REGKEY. Contact your antivirus AV to confirm that their software is compatible and have set the following REGKEY on the machine
Microsoft has reports of some customers with AMD devices getting into an unbootable state after installing this KB. To prevent this issue, Microsoft will temporarily pause Windows OS updates to devices with impacted AMD processors at this time. Microsoft is working with AMD to resolve this issue and resume Windows OS security updates to the affected AMD devices via Windows Update and WSUS as soon as possible. If you have experienced an unbootable state or for more information see KB4073707. For AMD specific information please contact AMD.
How to get this update
This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.
For a list of the files that are provided in this update, download the file information for update 4056895.
Direct download links for KB4056895 MSU file from Microsoft Update Catalog:
Download KB4056895 MSU for Windows 8.1 32-bit (x86) - 169.6 MB
Download KB4056895 MSU for Windows 8.1 64-bit (x64) - 306.9 MB