Microsoft releases KB4594443 and KB4594440 emergency

Microsoft has released an emergency update, included with KB4594443, for some versions of Windows 10 and with KB4594440 for other versions. The older versions receive KB4594443, while the two newer versions, 2004 and 20H2, receive KB4594440. These updates come to address a serious issue with Kerberos authentication after the latest fixes.

Thus, updates KB4594443 and KB4594440 for Windows 10 are coming with the aim of:

Addresses Kerberos authentication issues related to the PerformTicketSignature registry subkey value in CVE-2020-17049, which was part of the Windows Update November 10, 2020. The following issues may occur on domain controllers Writable (DC) and read-only: Kerberos service tickets and ticket granting tickets (TGTs) cannot be renewed for non-Windows Kerberos clients when PerformTicketSignature is set to 1 (default). Human service (S4U) scenarios, such as scheduled tasks, clustering, and services for line-of-business applications, can fail for all clients when PerformTicketSignature is set to 0. S4UProxy delegation fails on ticket reference in tickets Cross-domain scenarios if domain controllers in intermediate domains are updated inconsistently and PerformTicketSignature is set to 1.

Updates are already available through Windows Update and this is a recommended update.

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