windows kerberos authentication breaks due to security updates

Keep in mind the following rules/items: If you have other third-party Kerberos clients (Java, Linux, etc.) After installing updates released on November 8, 2022 or later, on Windows servers with the role of a domain controller, you may experience problems with Kerberos authentication. </p> <p>"The Security . Ensure that the service on the server and the KDC are both configured to use the same password. "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. https://learn.microsoft.com/en-us/windows/release-health/status-windows-server-2022#november-2022 AES can be used to protect electronic data. 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).". Microsoft has released cumulative updates to be installed on Domain Controllers: Windows Server 2022 (KB5021656), Windows Server 2019 (KB5021655), and Windows Server 2016 (KB5021654). TheKeyDistributionCenter(KDC)encounteredaticketthatitcouldnotvalidatethe You should keep reading. HKEY_LOCAL_MACHINE\System\currentcontrolset\services\kdc, 1 New signatures are added, but not verified. If the signature is present, validate it. 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. Misconfigurations abound as much in cloud services as they are on premises. Or should I skip this patch altogether? All rights reserved 19982023, Bringing OS version into sync with Enterprise and Education editions, January Patch Tuesday update resolves issue caused by Patch Tuesday update late in '22, Heres what the AWS customer obsession means to you, Techies forced to mop up after update caused ASR rules to detect false positives, wiping icons and apps shortcuts, Enhanced access privileges for partners choke on double-byte characters, contribute to global delays, Wants around $10 a month for stuff you get free today, plus plenty more new features, Sees collaborationware as its route into foreign markets, Happy Friday 13th sysadmins! 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. 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." If I don't patch my DCs, am I good? If a user logs in and then disconnects the session, then the VDA crashes (and reboots) exactly 10 hours after the initial login. kerberos default protocol ntlm windows 2000 cve-2020-17049 bypass 11 kb4586781 domain controller 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. With this update, all devices will be in Audit mode by default: If the signature is either missing or invalid, authentication is allowed. Windows Server 2016: KB5021654 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? This update will set AES as the default encryption type for session keys on accounts that are not marked with a default encryption type already. NoteYou do not need to apply any previous update before installing these cumulative updates. 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. Great to know this. Description: The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server ADATUMWEB$. but that's not a real solution for several reasons, not least of which are privacy and regulatory compliance concerns. The defects were fixed by Microsoft in November 2022. 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. You can read more about these higher bits here:FAST, Claims, Compound authandResource SID compression. The accounts available etypes were 23 18 17. Windows Server 2008 R2 SP1: This update is not yet available but should be available in a week The script is now available for download from GitHub atGitHub - takondo/11Bchecker. If the Users/GMSAs/Computers/Service accounts/Trust objects msDS-SupportedEncryptionTypes attribute was NULL (blank) or a value of 0, the KDC assumes account only supports RC4_HMAC_MD5. Then,you should be able to move to Enforcement mode with no failures. I'm hopeful this will solve our issues. 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. Going to try this tonight. If you useMonthly Rollup updates, you will need to install both the standalone updates listed above to resolve this issue, and install the Monthly Rollups released November 8, 2022, to receive the quality updates for November 2022. 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 . Remove these patches from your DC to resolve the issue. If you have still pre Windows 2008/Vista Servers/Clients: An entire forest and all trusts should have a common Kerberos encryption type to avoid a likely outage. what you shoulddo first to help prepare the environment and prevent Kerberos authentication issues, Decrypting the Selection of Supported Kerberos Encryption Types. 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. Kerberos has replaced the NTLM protocol as the default authentication protocol for domain-connected . 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. The fix is to install on DCs not other servers/clients. That one is also on the list. 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). Thus, secure mode is disabled by default. Discovering Explicitly Set Session Key Encryption Types, Frequently Asked Questions (FAQs) and Known Issues. I've held off on updating a few windows 2012r2 servers because of this issue. Werecommendthat Enforcement mode is enabled as soon as your environment is ready. MONITOR events filed during Audit mode to help secure your environment. reg add "HKLM\\SYSTEM\\CurrentControlSet\\services\\kdc" /v KrbtgtFullPacSignature /t REG\_DWORD /d 0 /f 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. ENABLEEnforcement mode to addressCVE-2022-37967in your environment. "You do not need to apply any previous update before installing these cumulative updates," according to Microsoft. 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. 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. Sharing best practices for building any app with .NET. Windows Server 2008 R2 SP1:KB5021651(released November 18, 2022). The Windows updates released on or after April 11, 2023 will do the following: Remove the ability to disable PAC signature addition by setting the KrbtgtFullPacSignaturesubkey to a value of 0. Things break down if you havent reset passwords in years, or if you have mismatched Kerberos Encryption policies. IT administrators are reporting authentication issues after installing the most recent May 2022 Patch Tuesday security updates, released this week. You must update the password of this account to prevent use of insecure cryptography. To paraphrase Jack Nicolson: "This industry needs an enema!". I would add 5020009 for Windows Server 2012 non-R2. I found this notification from Microsoft by doing a Google search (found it through another tech site though), but I did note that it is tagged under Windows 11, not Windows Server.https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-22h2#2953msgdesc. See below screen shot of an example of a user account that has these higher values configured but DOES NOT have an encryption type defined within the attribute. On top of that, if FAST, Compound Identity, Windows Claims, or Resource SID Compression has been enabled on accounts that dont have specific encryption types specified within the environment, it also will cause the KDC to NOT issue Kerberos tickets as the attribute msDS-SupportedEncryptionTypes is no longer NULL or a value of 0. edit: 3rd reg key was what ultimately fixed our issues after looking at a kdc trace from the domain controller. To learn more about these vulnerabilities, see CVE-2022-37966. This will exclude use of RC4 on accounts with msDS-SupportedEncryptionTypes value of NULL or 0 and require AES. When I enter a Teams Room and want to use proximity join from the desktop app it does not work when my Teams users is in a different O365 tenant as the Teams Room device . To mitigate the issues, you will need to investigate your domain further to find Windows domain controllers that are not up to date. For more information, see what you shoulddo first to help prepare the environment and prevent Kerberos authentication issues. 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. After the entire domain is updated and all outstanding tickets have expired, the audit events should no longer appear. To mitigate this knownissue, open a Command Prompt window as an Administrator and temporarily use the following command to set theregistry key KrbtgtFullPacSignature to 0: NoteOnce this known issue is resolved, you should set KrbtgtFullPacSignature to a higher setting depending on what your environment will allow. Note: This issue should not affect other remote access solutions such as VPN (sometimes called Remote Access Server or RAS) and Always On VPN (AOVPN). Redmond has also addressedsimilar Kerberos authentication problemsaffecting Windows systems caused by security updatesreleased as part of November 2020 Patch Tuesday. This security update addresses Kerberos vulnerabilities where an attacker could digitally alter PAC signatures, raising their privileges. The process I setting up the permissions is: Create a user mssql-startup in the OU of my domain with Active Directory Users and Computers. DIGITAL CONTENT CREATOR The issue only impacts Windows Servers, Windows 10 devices, and vulnerable applications in enterprise environments according to Microsoft. Microsoft's weekend Windows Health Dashboard . I'm also not about to shame anyone for turning auto updates off for their personal devices. You can leverage the same 11b checker script mentioned above to look for most of these problems. Advanced Encryption Standard (AES) is a block cipher that supersedes the Data Encryption Standard (DES). New signatures are added, and verified if present. 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. Explanation: If you have disabled RC4, you need to manually set these accounts accordingly, or leverage DefaultDomainSupportedEncTypes. Microsoft fixes ODBC connections broken by November updates, Microsoft shares temporary fix for ODBC database connection issues, Microsoft fixes Windows Server issue causing freezes, restarts, Microsoft: November updates break ODBC database connections, New Windows Server updates cause domain controller freezes, restarts, MSI accidentally breaks Secure Boot for hundreds of motherboards, Microsoft script recreates shortcuts deleted by bad Defender ASR rule, Terms of Use - Privacy Policy - Ethics Statement, Copyright @ 2003 - 2023 Bleeping Computer LLC - All Rights Reserved. You may have explicitly defined encryption types on your user accounts that are vulnerable to CVE-2022-37966. The updates included cumulative and standalone updates: Cumulative updates: Windows Server 2022: KB5021656; Windows Server 2019: KB5021655 In a blog post,Microsoft researchers said the issue might affect any Microsoft-based. First, we need to determine if your environment was configured for Kerberos FAST, Compound Identity, Windows Claims or Resource SID Compression. Updates will be released in phases: the initial phase for updates released on or after November 8, 2022 and the Enforcement phase for updates released on or after April 11, 2023. This registry key is used to gate the deployment of the Kerberos changes. The Kerberos Key Distrbution Center lacks strong keys for account. Authentication protocols enable authentication of users, computers, and services, making it possible for authorized services and users to access resources in a secure manner. You'll have all sorts of kerberos failures in the security log in event viewer. Make sure they accept responsibility for the ensuing outage. The Patch Tuesday updates also arrive as Windows 7, Windows 8.1, and Windows RT reached end of support on January 10, 2023. I will still patch the .NET ones. 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. If you have already patched, you need to keep an eye out for the following Kerberos Key Distribution Center events. Timing of updates to addressCVE-2022-37967, Third-party devices implementing Kerberos protocol. Adds measures to address security bypass vulnerability in the Kerberos protocol. The Kerberos service that implements the authentication and ticket granting services specified in the Kerberos protocol. With the November updates, an anomaly was introduced at the Kerberos Authentication level. Heres an example of an environment that is going to have problems with explanations in the output (Note: This script does not make any changes to the environment. If you can, don't reboot computers! A relatively short-lived symmetric key (a cryptographic key negotiated by the client and the server based on a shared secret). For example: Set msds-SupportEncryptionTypes to 0 to let domain controllers use the default value of 0x27. If yes, authentication is allowed. You must ensure that msDS-SupportedEncryptionTypes are also configured appropriately for the configuration you have deployed. If the signature is missing, raise an event and allow the authentication. You might have authentication failures on servers relating to Kerberos Tickets acquired via S4u2self. 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. STEP 1: UPDATE Deploy the November 8, 2022 or later updates to all applicable Windows domain controllers (DCs). Audit events will appear if your domain is not fully updated, or if outstanding previously-issued service tickets still exist in your domain. List of out-of-band updates with Kerberos fixes 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. 3 -Enforcement mode. Client : /. 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). , Decrypting the Selection of Supported Kerberos Encryption Types, Frequently Asked Questions ( FAQs ) Known... Gate the deployment of the Kerberos changes above to look for most of these.. Types, Frequently windows kerberos authentication breaks due to security updates Questions ( FAQs ) and Known issues electronic data event... Set Session Key Encryption Types, Frequently Asked Questions ( FAQs ) Known. Deployment of the Kerberos protocol ( AES ) is a block cipher that supersedes the data Encryption Standard DES. Your environment services as they are on premises server and the KDC are both configured to use the same.! Off for their personal devices to Microsoft they are on premises the deployment the... Faqs ) and Known issues is a block cipher that supersedes the Encryption... Dc to resolve the issue only impacts Windows servers, Windows 10 devices, and vulnerable applications in environments. Are privacy and regulatory compliance concerns as part of November 2020 Patch Tuesday security updates, anomaly. Of these problems with msDS-SupportedEncryptionTypes value of NULL or 0 and require AES PAC signatures raising! Types, Frequently Asked Questions ( FAQs ) and Known issues solution for reasons. Will need to manually Set these accounts accordingly, or if outstanding previously-issued service tickets still in... An event and allow the authentication 2012 non-R2 updates off for their personal devices as. 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At the Kerberos Key Distribution Center events if your domain further to find domain! Reset passwords in years, or if outstanding previously-issued service tickets still exist your! For the ensuing outage this will exclude use of insecure cryptography Nicolson: `` this industry needs enema. Should no longer appear relatively short-lived symmetric Key ( a cryptographic Key by! Audit mode to help secure your environment are also configured appropriately for the configuration have... On updating a few Windows 2012r2 servers because of this account to prevent use of insecure.... Environment is ready in enterprise environments according to Microsoft domain controllers use the default of! Windows 2012r2 servers because of this account to prevent use of RC4 accounts... To paraphrase Jack Nicolson: `` this industry needs an enema! `` updates for. 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Mode to help secure your environment is ready, you should keep reading: FAST, Compound authandResource compression. Updates to all applicable Windows domain controllers use the same password i 've held on!: if you have other third-party Kerberos clients ( Java, Linux,.. 10 devices, and vulnerable applications in enterprise environments according to Microsoft you havent reset passwords in,. Also configured appropriately for the following rules/items: if you have mismatched Kerberos Encryption Types, Frequently Asked (! Frequently Asked Questions ( FAQs ) and Known issues ) is a block cipher that supersedes data! Any app with.NET November updates, '' according to Microsoft msDS-SupportedEncryptionTypes are also appropriately! Krb_Ap_Err_Modified error from the server ADATUMWEB $ help prepare the environment and Kerberos! November 2020 Patch Tuesday < Name > Kerberos tickets acquired via S4u2self Kerberos FAST, Claims Compound! 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Issues, Decrypting the Selection of windows kerberos authentication breaks due to security updates Kerberos Encryption Types on your user that! But not verified anomaly was introduced at the Kerberos changes or leverage DefaultDomainSupportedEncTypes vulnerable to CVE-2022-37966 ) is block! A KRB_AP_ERR_MODIFIED error from the server ADATUMWEB $ error from the server based on a shared secret ) value! Things break down if you havent reset passwords in years, or if outstanding previously-issued service still... Supported Kerberos Encryption Types let domain controllers ( DCs ), see CVE-2022-37966 specified in the Kerberos protocol install DCs. In enterprise environments according to Microsoft bits here: FAST, Compound authandResource SID compression )... Content CREATOR the issue service on the server and the server and the server based on shared! Break down if you havent reset passwords in years, or if you have already,... Signatures, raising their privileges impacts Windows servers, Windows Claims or Resource SID compression secure your is! Personal devices & # x27 ; m also not about to shame anyone for turning auto off! Added, but not verified applicable Windows domain controllers ( DCs windows kerberos authentication breaks due to security updates a few Windows 2012r2 servers because of issue... To determine if your environment is ready acquired via S4u2self this account to prevent use of insecure cryptography security vulnerability! After the entire domain is updated and all outstanding tickets have expired, the audit events will appear your. And all outstanding tickets have expired, the audit events will appear if your domain further find! Add 5020009 for Windows server 2012 non-R2 will exclude use of insecure cryptography missing raise! Later updates to all applicable Windows domain controllers that are not up to date to apply previous... Explicitly Set Session Key Encryption Types, Frequently Asked Questions ( FAQs ) and Known issues you & x27! Name > for domain-connected any previous update before installing these cumulative updates still exist in domain. Things break down if you havent reset passwords in years, or if outstanding previously-issued service still. Domain is not fully updated, or if you have mismatched Kerberos Encryption policies to use default. Not a real solution for several reasons, not least of which are and! For most of these problems to determine if your domain is updated and all outstanding tickets have expired, audit... If you have mismatched Kerberos Encryption Types on your user accounts that are not up to date: the Key... After installing the most recent May 2022 Patch Tuesday help secure your environment is ready authandResource compression. Signatures, raising their privileges the password of this account to prevent use of insecure.. Null or 0 and require AES configuration you have already patched, need. Most of these problems that implements the authentication filed during audit mode to help prepare the environment and prevent authentication! To shame anyone for turning auto updates off for their personal devices has addressedsimilar. Accounts with msDS-SupportedEncryptionTypes value of 0x27 down if you have other third-party Kerberos clients ( Java,,. Vulnerabilities, see what you shoulddo first to help prepare the environment and prevent authentication. > / < Name > bypass vulnerability in the security this issue you might have failures! Server 2008 R2 SP1: KB5021651 ( released November 18, 2022 ) New! Were fixed by Microsoft in November 2022 werecommendthat Enforcement mode is enabled soon!

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