Microsoft released update KB5004945 build 1083 to the public today.

This update applies to Windows 10 2004 19041.1083, 20H2 19042.1083 and 21H1 19043.1083 and fixes the following issues.

Highlights

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

Improved or fixed

  • 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.

Workaround Fix PrintNightmare.

Download: x86-KB5004945
Download: x64-KB5004945
Download: arm-KB5004945