KB5005611 Timeline (Windows 10' PrintNightmare)

Sep 30, 2021 - KB5005611 released - Windows 10 servicing stack update (SSU) - non-security update.

• Implements a Group Policy setting for the following registry value:

  Registry location: HKLM\Software\Policies\Microsoft\Windows NT\Printers\PointAndPrint Value name: RestrictDriverInstallationToAdministrators Value data: 1 For more information, see KB5005652.

• Adds the ability to configure period or dot (.) delimited IP addresses interchangeably with fully qualified host names in the following Group Policy settings: Package Point and Print - Approved Servers; Point and Print Restrictions.
• Addresses a known issue that might prevent devices from downloading and installing printer drivers when the devices attempt to connect to a network printer for the first time. We have observed this issue on devices that access printers using a print server that uses HTTP connections.

Known side effects	Recommended workarounds(by Microsoft)
Installation of printers using Internet Printing Protocol (IPP) might not complete successfully.	KB5006738
On a print server, printing properties defined on that server might not be correctly provided to clients. Note this issue is specific to print servers and does not impact standard network printing. This issue will not cause printing operations to fail, however, custom settings defined on the server – for example, duplex print settings – will not be applied automatically, and clients will print with default settings only. This issue results from an improper building of the data file which contains the printer properties. Clients which receive this data file will not be able to use the file content and will instead proceed with default printing settings. Clients who have previously received the settings package prior to the installation of KB5005611 are unaffected. Servers which use default print settings and have no custom settings to provide to clients are unaffected.	KB5006670
You might receive a prompt for administrative credentials every time you attempt to print in environments in which the print server and print client are in different times zones.	KB5006670

Sep 30, 2021 - Windows 10 KB5005611 update fixes Microsoft Outlook issues BleepingComputer.com.

This update [...] makes it easier to mitigate the PrintNightmare vulnerability. [...] In July, Microsoft added a new group policy to require drivers only to be installed by administrators. Microsoft did this to fix a remote code execution vulnerability known as PrintNightmare. In August, Microsoft enabled this setting by default, causing numerous printing issues for enterprise users. While this setting was added as a group policy, it could only be enabled or disabled by manually editing the Windows Registry. Microsoft did this by adding the RestrictDriverInstallationToAdministrators value under the HKLM\Software\Policies\Microsoft\Windows NT\Printers\PointAndPrint key. Microsoft has introduced a group policy that allows you to manage this setting more easily with today's update. This new policy is named "Limits print driver installation to Administrators" and can be found under Computer Configuration > Administrative Templates > Printers.

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