October 15, 2019—KB4520012 (Preview of Monthly Rollup)

Applies to: Windows 8.1Windows Server 2012 R2

Improvements and fixes


This non-security update includes improvements and fixes that were a part of KB4520005 (released October 8, 2019) and also includes these new quality improvements as a preview of the next Monthly Rollup update:

  • Updates time zone information for Norfolk Island, Australia. 
  • Updates time zone information for the Fiji Islands. 
  • Addresses an issue with evaluating the compatibility status of the Windows ecosystem to help ensure application and device compatibility for all updates to Windows. For more information, see KB4525208.
  • Addresses an issue that prevents netdom.exe from displaying the new ticket-granting ticket (TGT) delegation bit for the display or query mode.
  • Addresses an issue with a race condition between the volume mount process (within fileinfo.sys) and the deregistration of filter notifications that causes the operating system to stop working on certain virtual machines. The error code is “0x7E.” 
  • Addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization. This issue occurs while performing full Transport Layer Security (TLS) handshakes from devices that don’t support EMS, especially on servers. EMS support has been available for all the supported versions of Windows since calendar year 2015 and is being incrementally enforced by the installation of the October 8, 2019 and later monthly updates.

Known issues in this update


Symptom

Workaround

Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.

Do one of the following:

  • Perform the operation from a process that has administrator privilege.
  • Perform the operation from a node that doesn’t have CSV ownership.
Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update


Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup.

If you are using Windows Update, the latest SSU (KB4521864) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog

Install this update

Release Channel Available Next Step
Windows Update or Microsoft Update Yes This is provided as an Optional update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.
Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS) Yes

This update will automatically synchronize with WSUS if you configure Products and Classifications as follows:

Product: Windows 8.1, Windows Server 2012 R2

Classification: Updates

 

File information

For a list of the files that are provided in this update, download the file information for update 4520012