![]() It seems a bit non-intuitive, but you have to manually create the key on your domain controllers, at least in my findings. If you apply the November 2021 security updates and don’t see the key, that is expected, not something wrong. One point of confusion that I had with this update and which is not really spelled out explicitly by Microsoft in the relevant KB articles, is whether this key is automatically created. PacRequestorEnforcement registry key settings If setting 0 is used, we recommend that you transition setting 0 (Disable) to setting 1 (Deployment) for at least a week before moving to setting 2 (Enforcement mode). Intermittent failures might occur if both settings are used within a forest. Important Setting 0 is not compatible with setting 2. ![]() Not recommended. Active Directory domain controllers in this mode are in the Disabled phase. This value will not exist after the Apor later updates. Active Directory domain controllers in this mode are in the Enforcement phase.Ġ: Disables the registry key. If the user does not have the new PAC, the authentication is denied. When authenticating, if the user has the new PAC, the PAC is validated. Active Directory domain controllers in this mode are in the Deployment phase.Ģ: Add the new PAC to users who authenticated using an Active Directory domain controller that has the Novemor later updates installed. If the user does not have the new PAC, no further action is taken. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Kdcġ: Add the new PAC to users who authenticated using an Active Directory domain controller that has the Novemor later updates installed. With the new November 2021 updates applied on domain controllers, the domain controller has the ability to understand a new registry key, called PacRequestoreEnforcement, added to the following location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Kdcīelow is the information on the registry key values that affect the behavior of your domain controllers moving forward and allows a phased rollout of the new security feature: Domain Controller PacRequestorEnforcement Registry Key – Enable Audit and Enforcement In the November 9, 2021, or later updates, these Privilege Attribute Certificate (PAC) are added to the TGT of all domain accounts. The new authentication process verifies the account that requested the TGT is the same account that is referenced by the service ticket. After patching your domain controllers, an improved authentication process is introduced that adds new information about the original requestor to teh PACs of Kerberos Ticket-Granting Tickets (TGTs). However, this is still a vulnerability you want to get patched. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists prepare the target environment to improve exploit reliability or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack). That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. Note the following:Ī successful attack depends on conditions beyond the attacker’s control. The attack complexity is noted as high for the vulnerability. The KDC is prevented from identifying which account the higher privilege service ticket is for. A compromised domain account might cause the KDC to create a service ticket with a higher privilege level than that of the compromised account. It allows an attacker to impersonate domain controllers. ![]() It is a security bypass vulnerability affecting Kerberos Privilege Attribute Certificate (PAC). The CVE-2021-42287 vulnerability is a CVSS:3.1 7.5/6.5 score on the vulnerability scale. KB5008380 Authentication Updates to address CVE-2021-42287 Let’s take a look at Domain Controller PacRequestorEnforcement Registry Key – Enable Audit and Enforcement and see how these changes will affect your Active Directory Domain Services (AD DS) environment in your home lab environments as well as production. It will fundamentally change the way domain controllers can interact with one another and will introduce breaking changes in your Active Directory environment if not planned out correctly. In case you didn’t already know, Microsoft is addressing critical vulnerabilities in the way Active Directory authentication works, specifically related to the KDC and Kerberos tickets.
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