Windows Kerberos Elevation of Privilege Vulnerability

What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could gain administrator privileges.

How could an attacker exploit this vulnerability? An authenticated attacker could leverage cryptographic protocol vulnerabilities in Windows Kerberos. If the attacker gains control on the service that is allowed for delegation, they can modify the Kerberos PAC to elevate their privileges.

Where can I find more information about these changes? For more information please see How to manage the Kerberos and Netlogon Protocol changes related to CVE-2022-37967.

Do I need to take further steps to be protected from this vulnerability? Yes. Please review the KB article How to manage the Kerberos and Netlogon Protocol changes related to CVE-2022-37967. This recommends that you: Use audit mode to review logs. Review third-party servers and clients. If I install the updates and take no further action, what will be the impact? Initially you will not be secure. There are additional actions an administrator needs to take that are outlined in the KB article. Why do I need to follow the guidelines in how to manage the changes in Kerberos associated with CVE-2022-37967? There is a risk of exploitation of the noted vulnerability if you don't take the required actions. How does Microsoft plan to address this vulnerability? To give administrators time to make corrections that prevent authentication failures, and to provide a choice on when to implement the enforcement, Microsoft is addressing this vulnerability in a phased rollout. UPDATE: Microsoft has released the October 2023 Windows security updates to implement Phase Five. For more information see KB article. What is the timeline for this rollout? Please refer to the planned enforcement timeline in the KB article. How can I be notified when the further updates are available? When each phase of Windows updates become available, customers will be notified via a revision to this security vulnerability. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this CVE. See Microsoft Technical Security Notifications and Security Update Guide Notification System News: Create your profile now – Microsoft Security Response Center.

I am running Windows Server 2022 Datacenter: Azure Edition (Server Core) but the hotpatch (Windows Server 2022 Datacenter: Azure Edition (Hotpatch)) for it is not listed in the Security Updates table. Is there an update that I can apply for this edition of Windows Server 2022? The update to address this vulnerability for Windows Server 2022 Datacenter: Azure Edition (Server Core) is not hotpatchable and is therefore not included in the November Hotpatch KB (5019080). Customers running Windows Server 2022 Datacenter: Azure Edition (Server Core) as a domain controller should install the update for Windows Server 2022 (5019081). This update will require a computer restart.