KB5004945 Windows 10 2004 19041.1083, 20H2 19042.1083, 21H1 19043.1083 Win Update

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    KB5004945 Windows 10 2004 19041.1083, 20H2 19042.1083, 21H1 19043.1083

    KB5004945 Windows 10 2004 19041.1083, 20H2 19042.1083, 21H1 19043.1083

    Out-of-band Cumulative Update - July 6, 2021
    Category: Win Update
    Last Updated: 13 Jul 2021 at 13:10
    UPDATE 7/13: KB5004237 Windows 10 2004 19041.1110, 20H2 19042.1110, 21H1 19043.1110


    The KB4562830 Enablement Package allows you to go from build 19041 (v2004) to 19042 (v20H2).

    The KB5000736 Enablement Package allows you to go from build 19042 (v20H2) to 19043 (v21H1).



    July 6, 2021 - KB5004945 (OS Builds 19041.1083, 19042.1083, and 19043.1083) Out-of-band

    6/21/21
    IMPORTANT This release includes the Flash Removal Package. Taking this update will remove Adobe Flash from the machine. For more information, see the Update on Adobe Flash Player End of Support.

    11/17/20
    For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. To view other notes and messages, see the Windows 10, version 2004 update history home page.

    Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard.

    Highlights

    • Updates a remote code execution exploit in the Windows Print Spooler service, known as “PrintNightmare”, as documented in CVE-2021-34527.

    Improvements and fixes

    Note: To view the list of addressed issues, click or tap the OS name to expand the collapsible section.

    Windows 10 servicing stack update - 19041.1081, 19042.1081, and 19043.1081

    • This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.

    Windows 10, version 21H1

    This security update includes quality improvements. Key changes include:

    • This build includes all the improvements from Windows 10, version 2004.
    • No additional issues were documented for this release.

    Windows 10, version 20H2

    This security update includes quality improvements. Key changes include:

    • This build includes all the improvements from Windows 10, version 2004.
    • No additional issues were documented for this release.

    Windows 10, version 2004

    This security update includes quality improvements. Key changes include:

    • Addresses a remote code execution exploit in the Windows Print Spooler service, known as “PrintNightmare”, as documented in CVE-2021-34527. After installing this and later Windows updates, users who are not administrators can only install signed print drivers to a print server. By default, administrators can install signed and unsigned printer drivers to a print server. The installed root certificates in the system’s Trusted Root Certification Authorities trusts signed drivers. Microsoft recommends that you immediately install this update on all supported Windows client and server operating system, starting with devices that currently host the print server role. You also have the option to configure the RestrictDriverInstallationToAdministrators registry setting to prevent non-administrators from installing signed printer drivers on a print server. For more information, see KB5005010.

    If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

    Windows Update Improvements
    Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.



    Known issues in this update

    Symptoms Workaround
    When using the Microsoft Japanese Input Method Editor (IME) to enter Kanji characters in an app that automatically allows the input of Furigana characters, you might not get the correct Furigana characters. You might need to enter the Furigana characters manually.

    Note The affected apps are using the ImmGetCompositionString() function.
    We are working on a resolution and will provide an update in an upcoming release.
    Devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge. This issue is only encountered when custom offline media or ISO images are created by slipstreaming this update into the image without having first installed the standalone servicing stack update (SSU) released March 29, 2021 or later.

    Note Devices that connect directly to Windows Update to receive updates are not affected. This includes devices using Windows Update for Business. Any device connecting to Windows Update should always receive the latest versions of the SSU and latest cumulative update (LCU) without any extra steps.
    To avoid this issue, be sure to first slipstream the SSU released March 29, 2021 or later into the custom offline media or ISO image before slipstreaming the LCU. To do this with the combined SSU and LCU packages now used for Windows 10, version 20H2 and Windows 10, version 2004, you will need to extract the SSU from the combined package. Use the following steps to extract the using SSU:

    1. Extract the cab from the msu via this command line (using the package for KB5000842 as an example): expand Windows10.0-KB5000842-x64.msu /f:Windows10.0-KB5000842-x64.cab <destination path>
    2. Extract the SSU from the previously extracted cab via this command line: expand Windows10.0-KB5000842-x64.cab /f:* <destination path>
    3. You will then have the SSU cab, in this example named SSU-19041.903-x64.cab. Slipstream this file into your offline image first, then the LCU.

    If you have already encountered this issue by installing the OS using affected custom media, you can mitigate it by directly installing the new Microsoft Edge. If you need to broadly deploy the new Microsoft Edge for business, see Download and deploy Microsoft Edge for business

    How to get this update

    Before installing this update

    Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

    Prerequisite:

    For Windows Server Update Services (WSUS) deployment:

    • Install the May 11, 2021 update (KB5003173) before you install the latest cumulative update.

    For offline Deployment Image Servicing and Management (DISM.exe) deployment:

    • If an image does not have the February 24, 2021 (KB4601382) or later cumulative update, install the January 12, 2021 SSU (KB4598481) and the May 11, 2021 update (KB5003173).

    Install this update

    Release Channel Available Next Step
    Windows Update or Microsoft Update Yes None. This update will be downloaded and installed automatically from Windows Update.
    Windows Update for Business Yes None. These changes will be included in the next security update to this channel.
    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 sync with WSUS if you configure Products and Classifications as follows:
    Product: Windows 10, version 1903 and later
    Classification: Security Updates

    If you want to remove the LCU
    To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

    Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

    File information

    For a list of the files that are provided in this update, download the file information for cumulative update 5004945.

    For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 19041.1081, 19042.1081, and 19043.1081.


    Source: https://support.microsoft.com/help/5004945

    See also: Out-of-band update to address a remote code execution exploit in the Windows Print Spooler service.


    Direct download links for KB5004945 MSU file from Microsoft Update Catalog:

    Download KB5004945 MSU for Windows 10 v2004, v20H2, and v21H1 32-bit (x86) - 270.9 MB

    Download KB5004945 MSU for Windows 10 v2004, v20H2, and v21H1 64-bit (x64) - 586.1 MB

    Download KB5004945 MSU for Windows 10 v2004, v20H2, and v21H1 ARM64 - 627.1 MB
    Brink's Avatar Posted By:

  1. AndreTen's Avatar
    Posts : 25,548
    Windows 10 (Pro and Insider Pro)
       #1

    Downloading on Insider Beta (not sure if this term still means anything..)
      My Computers

  2. Brink's Avatar
    Posts : 59,913
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #2

    KB5004945 Windows 10 2004 19041.1083, 20H2 19042.1083, 21H1 19043.1083-kb5004945.jpg
      My Computers

  3. steve108's Avatar
    Posts : 16,250
    19041.1348 - 2004/20H1 Pro x64
       #3

    I don't get MS logic of making updates available ahead of posting the release notes/change/fix logs :
    https://support.microsoft.com/help/5004945 ..... Sorry, page not found
    https://support.microsoft.com/search...uery=KB5004945 ..... Sorry, there are no results for KB5004945
      My Computer

  4. Zardoc's Avatar
    Posts : 496
    Windows 10 Enterprise
       #4

    https://docs.microsoft.com/en-us/win...ge-center#1646

    Take action: Out-of-band update to address a remote code execution exploit in the Windows Print Spooler service

    Microsoft identified a security issue that affects all versions of Windows and have expedited a resolution for supported versions of Windows that will automatically be applied to most devices. For more information on the security issue, see CVE-2021-34527.

    We recommend you update your devices as soon as possible. The update is available on all release channels including Windows Update, Microsoft Update Catalog and Windows Server Update Services (WSUS). For instructions on how to Check for updates on consumer devices and non-managed business devices, please see Update Windows 10.

    For instructions on how to install this update for your operating system, see the KB for your OS listed below:


    Note Release notes associated with these updates might publish with a delay of up to an hour after the updates are available for download.

    Important Updates for the remaining affected supported versions of Windows will be released in the coming days.
    2021-07-06
    1
      My Computer

  5. Bree's Avatar
    Posts : 21,828
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #5

    Apparently this is an emergency security fix for the 'PrintNightmare zero-day vulnerability'.

    Windows Print Spooler Remote Code Execution Vulnerability
    CVE-2021-34527


    Security VulnerabilityReleased: 1 Jul 2021 Last updated: 6 Jul 2021

    ...UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability.
    https://msrc.microsoft.com/update-gu...CVE-2021-34527
      My Computers


  6. Posts : 651
    Windows 10 Pro (21H2)
       #6

    Zardoc said:
    https://docs.microsoft.com/en-us/win...ge-center#1646

    Take action: Out-of-band update to address a remote code execution exploit in the Windows Print Spooler service

    Microsoft identified a security issue that affects all versions of Windows and have expedited a resolution for supported versions of Windows that will automatically be applied to most devices. For more information on the security issue, see CVE-2021-34527.

    We recommend you update your devices as soon as possible. The update is available on all release channels including Windows Update, Microsoft Update Catalog and Windows Server Update Services (WSUS). For instructions on how to Check for updates on consumer devices and non-managed business devices, please see Update Windows 10.

    For instructions on how to install this update for your operating system, see the KB for your OS listed below:


    Note Release notes associated with these updates might publish with a delay of up to an hour after the updates are available for download.

    Important Updates for the remaining affected supported versions of Windows will be released in the coming days.
    2021-07-06
    1
    Other than that all of the links return a 404 error, this is good information.

    Apparently MS is secretly reading my posts, as about an hour after I first stated that the links don' t work, they do so now.
    Last edited by Not Myself; 06 Jul 2021 at 18:51.
      My Computer


  7. IronZorg89's Avatar
    Posts : 2,555
    Windows 10 pro x64-bit
       #7

    steve108 said:
    I don't get MS logic of making updates available ahead of posting the release notes/change/fix logs :
    https://support.microsoft.com/help/5004945 ..... Sorry, page not found
    https://support.microsoft.com/search...uery=KB5004945 ..... Sorry, there are no results for KB5004945
    I don't get it either. At least MS could give a succinct resumé of what it is about. Without that, they are putting themselves in the lurch.
      My Computers

  8. Brink's Avatar
    Posts : 59,913
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #8

    Release notes now available. See first post.
      My Computers

  9. steve108's Avatar
    Posts : 16,250
    19041.1348 - 2004/20H1 Pro x64
       #9

    Installed on two PCs. So far, no issues
      My Computer


 
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