This update adds permissions checks during LDAP Add and Modify operations on attributes of computer or a computer-derived objects. Once you are satisfied there are no problems, you can modify the value to 2 putting the system into Enforcement mode. I strongly encourage reviewing these events regularly to understand any errors or warnings. This puts the system into audit mode where event IDs 35 through 38 are added to the Kdcsvc logs. Any domain controller not having this update will be incompatible with those that do.Ī new registry entry, PacRequestorEnforcement, is added under the key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Kdc with a default value of 1. Make sure this KB is part of your domain controller build or your default domain controller policy. Pay special attention as the update needs to be applied to all domain controllers, including any that are newly promoted. Mitigation consists of the installation of Windows updates on all devices that host the domain controller role and read-only domain controllers (RODCs). The additional information in the PAC is intended to address possible spoofing that allows potential attackers to cause the Key Distribution Center (KDC) to create a service ticket with a higher privilege level than that of the compromised account.
When subsequent service tickets are generated, Active Directory verifies that the account that requested the TGT is the same account referenced in the service ticket. The update immediately adds requestor details to a Kerberos Privileged Attribute Certificate (PAC). KB5008380 is intended to mitigate a known escalation of privilege exploit. At least one Microsoft Identity Manager 2016 installation threw Event ID 10 with event source. If you are experiencing unusual authentication errors, you may want to give it a read. IMPORTANT: An update is available as the initial bits have known issues that resulted in authentication failure under certain circumstances. When subsequent service tickets are generated, it verifies that the account that requested the TGT is the same account referenced in the service ticket.
This update adds requestor details to Kerberos Privileged Attribute Certificate (PAC). Here in Part 1 I discuss the two most critical updates Part 2 of this blog series features two more. Now is the time to start planning to avoid surprises. Two of these lay the groundwork for security features that will go into effect with the April 2022 update cycle. The Novem“Patch Tuesday” update to Windows Server 2019 includes four updates to the way Active Directory behaves.
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