I guess they cannot warn in advance as nobody knows until it's out there. Seehttps://go.microsoft.com/fwlink/?linkid=2210019tolearnmore. 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. ImportantStarting July 2023, Enforcement mode will be enabled on all Windows domain controllers and will block vulnerableconnections from non-compliant devices. A relatively short-lived symmetric key (a cryptographic key negotiated by the client and the server based on a shared secret). If the Users/GMSAs/Computers/Service accounts/Trust objects msDS-SupportedEncryptionTypes attribute was NULL (blank) or a value of 0, it defaults to an RC4_HMAC_MD5 encrypted ticket with AES256_CTS_HMAC_SHA1_96 session keys if the. 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. 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. It was created in the 1980s by researchers at MIT. The accounts available etypes were 23 18 17. Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext converts the data back into its original form, called plaintext. Windows Server 2008 SP2: KB5021657, oh well even after we patched with the November 17, 2022, we see Kerberos authentication issues. The whole thing will be carried out in several stages until October 2023. A special type of ticket that can be used to obtain other tickets. "After installing KB4586781 on domain controllers (DCs) and read-only domain controllers (RODCs) in your environment, you might encounter Kerberos authentication issues," Microsoft explains. KB5021130: How to manage Netlogon protocol changes related to CVE-2022-38023 Also turning on reduced security on the accounts by enable RC4 encryption should also fix it. Authentication protocols enable authentication of users, computers, and services, making it possible for authorized services and users to access resources in a secure manner. For information about protocol updates, see the Windows Protocol topic on the Microsoft website. For Configuration Manger instructions, seeImport updates from the Microsoft Update Catalog. 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. The Windows updates released on or after October 10, 2023 will do the following: Removes support for the registry subkey KrbtgtFullPacSignature. MOVE your Windows domain controllers to Audit mode by using the Registry Key setting section. Identify areas that either are missing PAC signatures or have PAC Signatures that fail validation through the Event Logs triggered during Audit mode. Microsoft last week released an out-of-band update for Windows to address authentication issues related to a recently patched Kerberos vulnerability. https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/decrypting-the-selection-of- https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/november-2022-out-of-band-upd https://support.microsoft.com/en-us/topic/kb5021131-how-to-manage-the-kerberos-protocol-changes-rela https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#2961. The script is now available for download from GitHub atGitHub - takondo/11Bchecker. KB4487026 breaks Windows Authentication February 2019 uptades breaks Windows Authentication After installing February 2019 updates to your IIS Server, Windows Authentication in your web application may stop working. 0x17 indicates RC4 was issued. systems that are currently using RC4 or DES: Contact the third-party vendor to see if the device/application can be reconfigured or updated to support AES encryption, otherwise replace them with devices/applications that support AES encryption and AES session keys. Supported values for ETypes: DES, RC4, AES128, AES256 NOTE: The value None is also supported by the PowerShell Cmdlet, but will clear out any of the supported encryption types. You must update the password of this account to prevent use of insecure cryptography. Environments without a common Kerberos Encryption type might have previously been functional due to automaticallyaddingRC4 or by the addition of AES, if RC4 was disabled through group policy by domain controllers. If this issue continues during Enforcement mode, these events will be logged as errors. So, we are going role back November update completely till Microsoft fix this properly. Changing or resetting the password of will generate a proper key. Microsoft releases another document, explaining further details related to the authentication problem caused by the security update addressing the privilege escalation vulnerabilities in Windows . Windows Server 2012 R2: KB5021653 This behavior has changed with the updates released on or afterNovember 8, 2022and will now strictly follow what is set in the registry keys, msds-SupportedEncryptionTypes and DefaultDomainSupportedEncTypes. Hello, Chris here from Directory Services support team with part 3 of the series. Look for accounts where DES / RC4 is explicitly enabled but not AES using the following Active Directory query: After installing the Windows updates that are dated on or after November 8, 2022,the following registry keyisavailable for the Kerberos protocol: HKEY_LOCAL_MACHINE\System\CurrentControlSet\services\KDC. reg add "HKLM\\SYSTEM\\CurrentControlSet\\Services\\Netlogon\\Parameters" /v RequireSeal /t REG\_DWORD /d 0 /f You do not need to install any update or make any changes to other servers or client devices in your environment to resolve this issue. "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/" How can I verify that all my devices have a common Kerberos Encryption type? If the November 2022/OOB updates have been deployed to your domain controller(s), determine if you are having problems with the inability for the domain controllers (KDC) to issue Kerberos TGTs or Service tickets. If the signature is incorrect, raise an event andallowthe authentication. If you've already registered, sign in. "4" is not listed in the "requested etypes" or "account available etypes" fields. In the articled Windows out-of-band updates with fix for Kerberos authentication ticket renewal issue I already reported about the first unscheduled correction updates for the Kerberos authentication problem a few days ago. After installed these updates, the workarounds you put in place are no longer needed. We are about to push November updates, MS released out-of-band updates November 17, 2022. For more information about Kerberos Encryption types, see Decrypting the Selection of Supported Kerberos Encryption Types. 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? 2 -Audit mode. If yes, authentication is allowed. To avoid redundancy, I will briefly cover a very important attribute called msDS-SupportedEncryptionTypes on objectClasses of User. This can be easily done one of two ways: If any objects are returned, then the supported encryption types will be REQUIRED to be configured on the objects msDS-SupportedEncryptionTypes attribute. You must update the password of this account to prevent use of insecure cryptography. All of the events above would appear on DCs. The Windows updates released on or after July 11, 2023 will do the following: Removes the ability to set value1for theKrbtgtFullPacSignaturesubkey. 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. Kerberos is a computer network authentication protocol which works based on tickets to allow for nodes communicating over a network to prove their identity to one another in a secure manner. TACACS: Accomplish IP-based authentication via this system. Meanwhile businesses are getting sued for negligence for failing to patch, even if those patches might break more than they fix. Find out more about the Microsoft MVP Award Program. Great to know this. <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 ) . This also might affect. If the KDCs Kerberos client is NOT configured to support any of the encryption types configured in the accounts msDS-SupportedEncryptionTypes attribute then the KDC will NOT issue a TGT or Service Ticket as there is no common Encryption type between the Kerberos Client, Kerberos enabled service, or the KDC. "If you have already installed updates released November 8, 2022, you do not need to uninstall the affected updates before installing any later updates including the [OOB] updates.". To mitigate this issue, follow the guidance on how to identify vulnerabilities and use the Registry Key setting section to update explicitly set encryption defaults. 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. Some of the common values to implement are:For AES128_CTS_HMAC_SHA1_96 and AES256_CTS_HMAC_SHA1_96 support, you would set the value to: 0x18. 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." NoteYou do not need to apply any previous update before installing these cumulative updates. Windows Kerberos authentication breaks after November updates (bleepingcomputer.com) 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 . If you have already installed updates released November 8, 2022, you do not need to uninstall the affected updates before installing any later updates including the updates listed above. I will still patch the .NET ones. 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