Ensure that the target SPN is only registered on the account used by the server. Microsoft released out-of-band emergency updates yesterday to fix the authentication issues, mentioning that the patches must be installed on all Domain Controllers in affected environments. A special type of ticket that can be used to obtain other tickets. The AES algorithm can be used to encrypt (encipher) and decrypt (decipher) information. TACACS: Accomplish IP-based authentication via this system. Windows Kerberos authentication breaks after November updates, Active Directory Federation Services (AD FS), Internet Information Services (IIS Web Server), https://dirteam.com/sander/2022/11/09/knowledgebase-you-experience-errors-with-event-id-42-and-source-kdcsvc-on-domain-controllers/, https://dirteam.com/sander/2022/11/09/knowledgebase-you-experience-errors-with-event-id-42-and-source-kdcsvc-on-domain-controllers/", https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-22h2#2953msgdesc, https://learn.microsoft.com/en-us/windows/release-health/status-windows-server-2022#november-2022, Domain user sign-in might fail. what you shoulddo first to help prepare the environment and prevent Kerberos authentication issues, Decrypting the Selection of Supported Kerberos Encryption Types. HKEY_LOCAL_MACHINE\System\currentcontrolset\services\kdc, 1 New signatures are added, but not verified. The issue is related to the PerformTicketSignature registry subkey value in CVE-2020-17049, a security feature bypass bug in Kerberos Key Distribution Center (KDC) that Microsoft fixed on November . Running the 11B checker (see sample script. After installing the november update on our 2019 domain controllers, this has stopped working. If the signature is present, validate it. ENABLEEnforcement mode to addressCVE-2022-37967in your environment. 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. fullPACSignature. Windows 10 servicing stack update - 19042.2300, 19044.2300, and 19045.2300. Remove these patches from your DC to resolve the issue. If you see any of these, you have a problem. 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). 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. It was created in the 1980s by researchers at MIT. Adds measures to address security bypass vulnerability in the Kerberos protocol. Introduction to this blog series:https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/having-issues-since-deploying Part 2 of this blog series:https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/so-you-say-your-dc-s-memory-i You must be a registered user to add a comment. If the account does have msds-SupportedEncryptionTypes set, this setting is honored and might expose a failure to have configured a common Kerberos Encryption type masked by the previous behavior of automatically adding RC4 or AES, which is no longer the behavior after installation of updates released on or after November 8, 2022. With the November 2022 security update, some things were changed as to how the Kerberos Key Distribution Center (KDC) Service on the Domain Controller determines what encryption types are supported by the KDC and what encryption types are supported by default for users, computers, Group Managed Service Accounts (gMSA), and trust objects within the domain. Microsoft confirmed that Kerberos delegation scenarios where . I guess they cannot warn in advance as nobody knows until it's out there. 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. If any of these have started around the same time as the November security update being installed, then we already know that the KDC is having issues issuing TGT or Service tickets. When a problem occurs, you may receive a Microsoft-Windows-Kerberos-Key-Distribution-Center error with Event ID 14 in the System section of the event log on your domain controller. I don't know if the update was broken or something wrong with my systems. <p>Hi All, </p> <p>We are experiencing the event id 40960 from half of our Windows 10 workstations - ( These workstations are spread across different sites ) . The second deployment phase starts with updates released on December 13, 2022. This meant you could still get AES tickets. Blog reader EP has informed me now about further updates in this comment. 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. 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. The whole thing will be carried out in several stages until October 2023. You may have explicitly defined encryption types on your user accounts that are vulnerable to CVE-2022-37966. 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). CVE-2020-17049 is a remotely exploitable Kerberos Constrained Delegation (KCD) security feature bypass vulnerability that exists in the way KDC determines if service tickets can be used for delegation via KCD. As noted in CVE-2020-17049, there are three registry setting values for PerformTicketSignature to control it, but in the current implementation you might encounter different issues with each setting.". On Monday, the business recognised the problem and said it had begun an . What is the source of this information? This specific failure is identified by the logging of Microsoft-Windows-Kerberos-Key-Distribution-Center Event ID 14 in the System event log of DC role computers with this unique signature in the event message text: 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). but that's not a real solution for several reasons, not least of which are privacy and regulatory compliance concerns. If the signature is either missing or invalid, authentication is allowed and audit logs are created. Client: Windows 7 SP1, Windows 8.1, Windows 10 Enterprise LTSC 2019, Windows 10 Enterprise LTSC 2016, Windows 10 Enterprise 2015 LTSB, Windows 10 20H2 or later, and Windows 11 21H2 or later. For Configuration Manger instructions, seeImport updates from the Microsoft Update Catalog. Authentication protocols enable. AES is used in symmetric-key cryptography, meaning that the same key is used for the encryption and decryption operations. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. This knownissue can be mitigated by doing one of the following: Set msds-SupportedEncryptionTypes with bitwise or set it to the current default 0x27 to preserve its current value. This will exclude use of RC4 on accounts with msDS-SupportedEncryptionTypes value of NULL or 0 and require AES. RC4 should be disabled unless you are running systems that cannot use higher encryption ciphers. Discovering Explicitly Set Session Key Encryption Types, Frequently Asked Questions (FAQs) and Known Issues. Client : /, The Key Distribution Center (KDC) encountered a ticket that did not contained the full PAC Signature. NoteIf you need to change the default Supported Encryption Type for an Active Directory user or computer, manually add and configure the registry key to set the new Supported Encryption Type. 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. Fixed our issues, hopefully it works for you. Make sure that the domain functional level is set to at least 2008 or greater before moving to Enforcement mode. Along with Microsoft Windows, Kerberos support has been built into the Apple macOS, FreeBSD, and Linux. IT administrators are reporting authentication issues after installing the most recent May 2022 Patch Tuesday security updates, released this week. 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. To mitigate the issues, you will need to investigate your domain further to find Windows domain controllers that are not up to date. All domain controllers in your domain must be updated first before switching the update to Enforced mode. 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. With the security updates of November 8, 2022, Microsoft has also initiated a gradual change to the Netlogon and Kerberos protocols. The update, released Sunday, should be applied to Windows Server 2008, 2012, 2016 and 2019 installations where the server is being used as a domain controller. People in your environment might be unable to sign into services or applications using Single Sign On (SSO) using Active Directory or in a hybrid Azure AD environment. edit: 3rd reg key was what ultimately fixed our issues after looking at a kdc trace from the domain controller. If yes, authentication is allowed. List of out-of-band updates with Kerberos fixes Event ID 14 errors from all our computers are logged even though our KrbtgFullPacSignature reg key is set to Audit Mode (2) per the Microsoft guide. The reason is three vulnerabilities (CVE-2022-38023 and CVE-2022-37967) in Windows 8.1 to Windows 11 and the server counterparts. Windows Kerberos authentication breaks due to security updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. The Kerberos Key Distribution Center lacks strong keys for account: accountname. Also, Windows Server 2022: KB5019081. 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. This literally means that the authentication interactions that worked before the 11b update that shouldn't have, correctly fail now. You need to read the links above. If you can, don't reboot computers! Hello, Chris here from Directory Services support team with part 3 of the series. What a mess, Microsoft How does Microsoft expect IT staff to keep their essential business services up-to-date when any given update has a much-larger-than-zero chance of breaking something businesses depend on to get work done? See https://go.microsoft.com/fwlink/?linkid=2210019 to learn more. Next StepsIf you are already running the most up-to-date software and firmware for your non-Windows devices and have verified that there is a common Encryption type available between your Windows domain controllersand your non-Windows devices, you will need to contact your device manufacturer (OEM) for help or replace the devices with ones that are compliant. reg add "HKLM\\SYSTEM\\CurrentControlSet\\services\\kdc" /v KrbtgtFullPacSignature /t REG\_DWORD /d 0 /f Changing or resetting the password of will generate a proper key. Running the following Windows PowerShell command to show you the list of objects in the domain that are configured for these. Kerberos support has been built into the Apple macOS, FreeBSD, and Linux reg key was what fixed. Https: //go.microsoft.com/fwlink/? linkid=2210019 to learn more before switching the update to Enforced mode do know... Will need to investigate your domain must be updated first before switching the update to Enforced mode:. 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