To get the standalone package for these out-of-band updates, search for the KB number in theMicrosoft Update Catalog. Explanation: If you have disabled RC4, you need to manually set these accounts accordingly, or leverage DefaultDomainSupportedEncTypes. Looking at the list of services affected, is this just related to DS Kerberos Authentication? You can read more about these higher bits here:FAST, Claims, Compound authandResource SID compression. The value data required would depend on what encryption types that are required to be configured for the domain or forest for Kerberos Authentication to succeed again. If yes, authentication is allowed. Microsoft doesn't give IT staff any time to verify the quality of any patches before availability (outside of C-week preview patches- which doesn't actually contain the security patches - not really useful for testing since patch Tuesday is always cumulative, not separate.). The solution is to uninstall the update from your DCs until Microsoft fixes the patch. Event ID 27 Description: While processing a TGS request for the target server http/foo.contoso.com, the account admin@CONTOSO.COM did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 9). If you obtained a version previously, please download the new version. Half of our domain controllers are updated, and about half of our users get a 401 from the backend server, and for the rest of the users, it is working as normal. After installing updates released May 10, 2022 on your domain controllers, you might see authentication failures on the server or client for services such as Network Policy Server (NPS), Routing and Remote access Service (RRAS), Radius, Extensible Authentication Protocol (EAP), and Protected Extensible Authentication Protocol (PEAP). Microsoft has released cumulative updates to be installed on Domain Controllers: Windows Server 2022 (KB5021656), Windows Server 2019 (KB5021655), and Windows Server 2016 (KB5021654). NoteYou do not need to apply any previous update before installing these cumulative updates. Windows 10 servicing stack update - 19042.2300, 19044.2300, and 19045.2300. I'd prefer not to hot patch. Identify areas that either are missing PAC signatures or have PAC Signatures that fail validation through the Event Logs triggered during Audit mode. ENABLEEnforcement mode to addressCVE-2022-37967in your environment. Description: The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server ADATUMWEB$. Or is this just at the DS level? After installed these updates, the workarounds you put in place are no longer needed. Microsoft confirmed that Kerberos delegation scenarios where . I don't know if the update was broken or something wrong with my systems. Running the 11B checker (see sample script. If you are experiencing this signature above, Microsoft strongly recommends installing the November out of band patch (OOB) which mitigated this regression. You'll want to leverage the security logs on the DC throughout any AES transition effort looking for RC4 tickets being issued. Explanation: The fix action for this was covered above in the FAST/Windows Claims/Compound Identity/Resource SID compression section. The requested etypes were 18. You need to read the links above. This literally means that the authentication interactions that worked before the 11b update that shouldn't have, correctly fail now. Kerberos has replaced the NTLM protocol as thedefault authentication protocolfor domain-connected devices on all Windows versions above Windows 2000. STEP 1: UPDATE Deploy the November 8, 2022 or later updates to all applicable Windows domain controllers (DCs). It is strongly recommended that you read the following article before going forward if you are not certain about Kerberos Encryption types are nor what is supported by the Windows Operating System: Understanding Kerberos encryption types: https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/decrypting-the-selection-of- Before we dive into what all has changed, note that there were some unexpected behaviors with the November update: November out-of-band announcement:https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/november-2022-out-of-band-upd Kerberos changes related to Encryption Type:https://support.microsoft.com/en-us/topic/kb5021131-how-to-manage-the-kerberos-protocol-changes-rela November out-of-band guidance:https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#2961. This seems to kill off RDP access. This issue might affect any Kerberos authentication in your environment," explains Microsoft in a document. This XML query below can be used to filter for these: You need to evaluate the passwordLastSet attribute for all user accounts (including service accounts) and make sure it is a date later than when Windows Server 2008 (or later) DCs were introduced into the environment. They should have made the reg settings part of the patch, a bit lame not doing so. BleepingComputer readers also reported three days ago thatthe November updates breakKerberos"in situations where you have set the 'This account supports Kerberos AES 256 bit encryption' or 'This account supports Kerberos AES 128 bit encryption' Account Options set (i.e., msDS-SupportedEncryptionTypes attribute) on user accounts in AD.". For more information, see[SCHNEIER]section 17.1. 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Then,you should be able to move to Enforcement mode with no failures. The vendor on November 8 issued two updates for hardening the security of Kerberos as well as Netlogon, another authentication tool in the wake of two vulnerabilities tracked as CVE-2022-37967 and CVE-2022-37966. Domains with third-party clients mighttake longer to fully be cleared of audit events following the installation of a November 8, 2022 or later Windows update. It's also mitigated by a single email and/or an auto response to any ticket with the word "Authenticator" in it after February 23rd. BleepingComputer readers also reported three days ago that the November updates break Kerberos "in situations where you have set the 'This account supports Kerberos AES 256 bit encryption' or 'This account supports Kerberos AES 128 bit encryption' Account Options set (i.e., msDS-SupportedEncryptionTypes attribute) on user accounts in AD." 2003?? This registry key is used to gate the deployment of the Kerberos changes. Changing or resetting the password of
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