Kerberos replaced the NTLM protocol to be the default authentication protocol for domain connected devices on all Windows versions above Windows 2000. The November 8, 2022 and later Windows updates address security bypass and elevation of privilege vulnerability with Authentication Negotiation by using weak RC4-HMAC negotiation. It must have access to an account database for the realm that it serves. Accounts that are flagged for explicit RC4 usage may be vulnerable. MONITOR events filed duringAudit mode to secure your environment. "This is caused by an issue in how CVE-2020-17049 was addressed in these updates. "After installing updates released on November 8, 2022 or later on Windows Servers with the Domain Controller role, you might have issues with Kerberos authentication," Microsoft explained. After installing the november update on our 2019 domain controllers, this has stopped working. The requested etypes were 23 3 1. 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Kerberos has replaced the NTLM protocol as the default authentication protocol for domain-connected . <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 ) . Changing or resetting the password of will generate a proper key. While updating, make sure to keep the KrbtgtFullPacSignature registry value in the default state until all Windows domain controllers are updated. Next stepsWe are working on a resolution and will provide an update in an upcoming release. Domains that have third-party domain controllers might see errors in Enforcement mode. 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 . Right-click the SQL server computer and select Properties, and select the Security tab and click Advanced, and click Add. 08:42 AM. With this update, all devices will be in Audit mode by default: If the signature is either missing or invalid, authentication is allowed. Great to know this. Developers breaking shit or making their apps worse without warning is enough of a reason to update apps manually. 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. I don't know if the update was broken or something wrong with my systems. fullPACSignature. Remove these patches from your DC to resolve the issue. The November 8, 2022 Windows updates address security bypass and elevation of privilege vulnerabilities with Privilege Attribute Certificate (PAC) signatures. 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. Got bitten by this. Keep in mind the following rules/items: If you have other third-party Kerberos clients (Java, Linux, etc.) If you find either error on your device, it is likely that all Windowsdomain controllers in your domain are not up to date with a November 8, 2022 or later Windows update. Make sure they accept responsibility for the ensuing outage. You might be unable to access shared folders on workstations and file shares on servers. The field you'll need to focus on is called "Ticket Encryption Type" and you're looking for 0x17. Machines only running Active Directory are not impacted. 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/. Windows 10 servicing stack update - 19042.2300, 19044.2300, and 19045.2300. CISOs/CSOs are going to jail for failing to disclose breaches. Should I not patch IIS, RDS, and Files Servers? This security update addresses Kerberos vulnerabilities where an attacker could digitally alter PAC signatures, raising their privileges. Microsoft advised customers to update to Windows 11 in lieu of providing ESU software for Windows 8.1. These technologies/functionalities are outside the scope of this article. 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. Translation: The krbtgt account has not been reset since AES was introduced into the environment.Resolution: Reset the krbtgt account password after ensuring that AES has not been explicitly disabled on the DC. We're having problems with our on-premise DCs after installing the November updates. 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. So now that you have the background as to what has changed, we need to determine a few things. 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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. 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. Techies find workarounds but Redmond still 'investigating', And the largest such group in the gaming industry, says Communications Workers of America, Amazon Web Services (AWS) Business Transformation, Microsoft makes a game of Team building, with benefits, After 47 years, Microsoft issues first sexual harassment and gender report, Microsoft warns Direct Access on Windows 10 and 11 could be anything but, Microsoft to spend $1 billion on datacenters in North Carolina. If you tried to disable RC4 in your environment, you especially need to keep reading. Can I expect msft to issue a revision to the Nov update itself at some point? After the latest updates, Windows system administrators reported various policy failures. For example: Set msds-SupportEncryptionTypes to 0 to let domain controllers use the default value of 0x27. You'll want to leverage the security logs on the DC throughout any AES transition effort looking for RC4 tickets being issued. For Configuration Manger instructions, seeImport updates from the Microsoft Update Catalog. Ensure that the target SPN is only registered on the account used by the server. It is a network service that supplies tickets to clients for use in authenticating to services. Example "Group Managed Service Accounts (gMSA) used for services such as Internet Information Services (IIS Web Server) might fail to authenticate" LAST UPDATED ON NOVEMBER 15, 2022 QUICK READ 1 min Let's get started! Explanation: The fix action for this was covered above in the FAST/Windows Claims/Compound Identity/Resource SID compression section. RC4 should be disabled unless you are running systems that cannot use higher encryption ciphers. The updates included cumulative and standalone updates: Cumulative updates: Windows Server 2022: KB5021656; Windows Server 2019: KB5021655 If the signature is either missing or invalid, authentication is allowed and audit logs are created. If the signature is either missing or invalid, authentication is denied and audit logs are created. If you used any workaround or mitigations for this issue, they are no longer needed, and we recommend you remove them. To avoid redundancy, I will briefly cover a very important attribute called msDS-SupportedEncryptionTypes on objectClasses of User. If the signature is present, validate it. 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 . Once all audit events have been resolved and no longer appear, move your domains to Enforcement modeby updating the KrbtgtFullPacSignature registry value as described in Registry Key settingssection. Users of Windows systems with the bug at times were met with a "Microsoft-Windows-Kerberos-Key-Distribution-Center Event ID 14 error event" notice in the System section of the Event Log on their Domain Controller with text that included: "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).". Unsupported versions of Windows includes Windows XP, Windows Server 2003,Windows Server 2008 SP2, and Windows Server 2008 R2 SP1 cannot be accessed by updated Windows devices unless you have an ESU license. Timing of updates to address Kerberos vulnerabilityCVE-2022-37967, KB5021131: How to manage the Kerberos protocol changes related to CVE-2022-37966, Privilege Attribute Certificate Data Structure. As we reported last week, updates released November 8 or later that were installed on Windows Server with the Domain Controller duties of managing network and identity security requests disrupted Kerberos authentication capabilities, ranging from failures in domain user sign-ins and Group Managed Service Accounts authentication to remote desktop connections not connecting. "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/" To mitigate the issues, you will need to investigate your domain further to find Windows domain controllers that are not up to date. For information about how to verify you have a common Kerberos Encryption type, see question How can I verify that all my devices have a common Kerberos Encryption type? kb5020023 - Windows Server 2012 Looking at the list of services affected, is this just related to DS Kerberos Authentication? 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