Initial deployment – Introduction of the update, as well as the PacRequestorEnforcement registry key These Windows Updates will be released in three phases: Starting with the (updated) OctoEnforcement Phase update, Enforcement mode will be enabled on all Windows domain controllers and will be required. Find the OOB KB number for your specific OS below.Īfter installing the Novemsecurity update and the NovemOOB update on all Active Directory domain controllers for at least 7 days, we strongly suggest that you enable Enforcement mode on all Active Directory domain controllers. Update all devices that host the Active Directory domain controller role by installing the Novemsecurity update and the Novemout-of-band (OOB) update. To protect your environment and avoid outages, please complete the following steps: Later, when a Kerberos service ticket is generated for an account, the new authentication process will verify that the account that requested the TGT is the same account referenced in the service ticket.Īfter installing Windows updates dated Novemor later, PACs will be added to the TGT of all domain accounts, even those that previously chose to decline PACs. The improved authentication process in CVE-2021-42287 adds new information about the original requestor to the PACs of Kerberos Ticket-Granting Tickets (TGT). ![]() ![]() It accomplishes this by preventing the KDC from identifying which account the higher privilege service ticket is for. To exploit this vulnerability, a compromised domain account might cause the Key Distribution Center (KDC) to create a service ticket with a higher privilege level than that of the compromised account. ![]() CVE-2021-42287 addresses a security bypass vulnerability that affects the Kerberos Privilege Attribute Certificate (PAC) and allows potential attackers to impersonate domain controllers.
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