If no objects are returned via method 1, or 11B checker doesnt return any results for this specific scenario, it would be easier to modify the default supported encryption type for the domain via a registry value change on all the domain controllers (KDCs) within the domain. This can be done by Filtering the System Event log on the domain controllers for the following: Event Log: SystemEvent Source: Kerberos-Key-Distribution-CenterEvent IDs: 16,27,26,14,42NOTE: If you want to know about the detailed description, and what it means, see the section later in this article labeled: Kerberos Key Distribution Center Event error messages. After installing updates released on or after November 8, 2022 on your domain controllers, all devices must support AES ticket signing as required to be compliant with the security hardening required for CVE-2022-37967. The OOB should be installed on top of or in-place of the Nov 8 update on DC Role computers while paying attention to special install requirements for Windows Updates on pre-WS 2016 DCs running on the Monthly Rollup (MR) or SO (Security only) servicing branches. To avoid redundancy, I will briefly cover a very important attribute called msDS-SupportedEncryptionTypes on objectClasses of User. The Ticket-granting Ticket (TGT) is obtained after the initial authentication in the Authentication Service (AS) exchange; thereafter, users do not need to present their credentials, but can use the TGT to obtain subsequent tickets. Microsoft releases another document, explaining further details related to the authentication problem caused by the security update addressing the privilege escalation vulnerabilities in Windows . Click Select a principal and enter the startup account mssql-startup, then click OK. There was a change made to how the Kerberos Key Distribution Center (KDC) Service determines what encryption types are supported and what should be chosen when a user requests a TGT or Service Ticket. This known issue the following KBs KB5007206, KB5007192, KB5007247, KB5007260, KB5007236, KB5007263. See https://go.microsoft.com/fwlink/?linkid=2210019 to learn more. If this extension is not present, authentication is allowed if the user account predates the certificate. The target name used was HTTP/adatumweb.adatum.com. "When this issue is encountered you might receive a Microsoft-Windows-Kerberos-Key-Distribution-Center Event ID 14 error event in the System section of Event Log on your Domain Controller with the below text.". The registry key was not created ("HKEY_LOCAL_MACHINE\System\currentcontrolset\services\kdc\" KrbtgtFullPacSignature) after installing the update. What happened to Kerberos Authentication after installing the November 2022/OOB updates? If you've already registered, sign in. Fixes promised. The list of Kerberos authentication scenarios includes but is not limited to the following: The complete list of affected platforms includes both client and server releases: While Microsoft hasstarted enforcing security hardeningfor Netlogon and Kerberos beginning with the November 2022 Patch Tuesday, the company says this known issue is not an expected result. Note that this out-of-band patch will not fix all issues. Running the 11B checker (see sample script. New signatures are added, and verified if present. The November updates, according to readers of BleepingComputer, "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., the msDS-SupportedEncryptionTypes attribute on user accounts in AD). Microsoft is investigating a new known issue causing enterprise domain controllers to experience Kerberos authentication problems after installing security updates released to address CVE-2020-17049 during this month's Patch Tuesday, on November 10. KDCsare integrated into thedomain controllerrole. Timing of updates to addressCVE-2022-37967, Third-party devices implementing Kerberos protocol. How can I verify that all my devices have a common Kerberos Encryption type? After deploying theupdate, Windows domain controllers that have been updatedwill have signatures added to the Kerberos PAC Buffer and will be insecureby default (PAC signature is not validated). Still, the OOB patch fixed most of these issues, and again it was only a problem if you disabled RC4. Uninstalling the November updates from our DCs fixed the trust/authentication issues. If you have an ESU license, you will need to install updates released on or after November 8, 2022and verify your configuration has a common Encryption type available between all devices. More information on potential issues that could appear after installing security updates to mitigate CVE-2020-17049 can be found here. 2003?? Here you go! To deploy the Windows updates that are dated November 8, 2022 or later Windows updates, follow these steps: UPDATEyour Windows domain controllers with an update released on or after November 8, 2022. reg add "HKLM\\SYSTEM\\CurrentControlSet\\Services\\Netlogon\\Parameters" /v RequireSeal /t REG\_DWORD /d 0 /f If you have verified the configuration of your environment and you are still encountering issues with any non-Microsoft implementation of Kerberos, you will need updates or support from the developer or manufacturer of the app or device. Translation: There is a mismatch between what the requesting client supports and the target service account.Resolution: Analyze the service account that owns the SPN and the client to determine why the mismatch is occurring. "While processing an AS request for target service , the account did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 1)," the logged errors read. If your security team gives you a baseline image or a GPO that has RC4 disabled, and you havent finished prepping the entire environment to solely support AES, point them to this article. Microsoft fixes Windows Kerberos auth issues in emergency updates, Microsoft fixes ODBC connections broken by November updates, Microsoft shares temporary fix for ODBC database connection issues, Microsoft: November updates break ODBC database connections, Microsoft fixes issue causing 0xc000021a blue screen crashes, Those having Event ID 42, this might help:https://dirteam.com/sander/2022/11/09/knowledgebase-you-experience-errors-with-event-id-42-and-source-kdcsvc-on-domain-controllers/. Security updates behind auth issues. "4" is not listed in the "requested etypes" or "account available etypes" fields. 2 - Checks if there's a strong certificate mapping. If yes, authentication is allowed. Microsoft's weekend Windows Health Dashboard . Deploy the November 8, 2022 or later updates to all applicable Windows domain controllers (DCs). This is caused by a known issue about the updates. Kerberos domain-controlled Windows devices using MIT Kerberos realms impacted by this newly acknowledged issue include both domain controllers and read-only domain controllers as explained by Microsoft. Workaround from MSFT engineer is to add the following reg keys on all your dcs. We will likely uninstall the updates to see if that fixes the problems. You must update the password of this account to prevent use of insecure cryptography. Configurations where FAST/Windows Claims/Compound Identity/Disabled Resource SID Compression were implemented had no impact on the KDCs decision for determining Kerberos Encryption Type. Experienced issues include authentication issues when using S4U scenarios, cross-realm referrals failures on Windows and non-Windows devices for Kerberos referral tickets, and certain non-compliant Kerberos tickets being rejected, depending on the value of the PerformTicketSignature setting. Machines only running Active Directory are not impacted. kb5019966 - Windows Server 2019. You'll want to leverage the security logs on the DC throughout any AES transition effort looking for RC4 tickets being issued. Otherwise, register and sign in. The Ticket-granting Ticket (TGT) is obtained after the initial authentication in the Authentication Service (AS) exchange; thereafter, users do not need to present their credentials, but can use the TGT to obtain subsequent tickets. After installing the november update on our 2019 domain controllers, this has stopped working. Event ID 26 Description: While processing an AS request for target service krbtgt/CONTOSO.COM, the account Client$ did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 3). Prior to the November 2022 update, the KDC made some assumptions: After November 2022 Update the KDC Makes the following decisions: As explained above, the KDC is no longer proactively adding AES support for Kerberos tickets, and if it is NOT configured on the objects then it will more than likely fail if RC4_HMAC_MD5 has been disabled within the environment. The server platforms impacted by this issue are listed in the table below, together with the cumulative updates causing domain controllers to encounter Kerberos authentication and ticket renewal problems after installation. New signatures are added, and verified if present. Those updates led to the authentication issues that were addressed by the latest fixes. I'm also not about to shame anyone for turning auto updates off for their personal devices. Microsoft is investigating a new known issue causing enterprise domain controllers to experience Kerberos sign-in failures and other authentication problems after installing cumulative updates released during this month's Patch Tuesday. Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext converts the data back into its original form, called plaintext. Within the German blog post November 2022-Updates fr Windows: nderungen am Netlogon- und Kerberos-Protokoll and within the English version Updates for Windows (Nov. 2022): Changes in Netlogon and Kerberos protocol - causing issues affected administrators are discussing strategies how to mitigate the authentification issues. After deploying the update, Windows domain controllers that have been updated will have signatures added to the Kerberos PAC Buffer and will be insecure by default (PAC signature is not validated). Read our posting guidelinese to learn what content is prohibited. Find out more about the Microsoft MVP Award Program. To run a command on Linux to dump the supported encryption types for a keytab file: The sample script "11B checker" text previously found at the bottom of this post has been removed. The AES algorithm can be used to encrypt (encipher) and decrypt (decipher) information. AES can be used to protect electronic data. This will exclude use of RC4 on accounts with msDS-SupportedEncryptionTypes value of NULL or 0 and require AES.