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. 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. 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. In the past 2-3 weeks I've been having problems. The service runs on computers selected by the administrator of the realm or domain; it is not present on every machine on the network. Security updates behind auth issues. Windows Server 2012 R2: KB5021653 The beta and preview chanels don't actually seem to preview anything resembling releases, instead they're A/B testing which is useless to anyone outside of Microsoft. The issue does not impact devices used by home customers and those that aren't enrolled in an on-premises domain. The Windows updates released on or after July 11, 2023 will do the following: Removes the ability to set value1for theKrbtgtFullPacSignaturesubkey. 1 more reply Bad-Mouse 13 days ago There also were other issues including users being unable to access shared folders on workstations and printer connections that require domain user authentication failing. 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. 0x17 indicates RC4 was issued. Windows Server 2012: KB5021652 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. 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. The November OS updates listed above will break Kerberos on any system that has RC4 disabled. 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 this extension is not present, authentication is allowed if the user account predates the certificate. 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. Explanation: The fix action for this was covered above in the FAST/Windows Claims/Compound Identity/Resource SID compression section. 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. This known issue was resolved in out-of-band updates released November 17, 2022 and November 18, 2022 for installation onalldomain controllersin your environment. Youll need to consider your environment to determine if this will be a problem or is expected. Event ID 27 Description: While processing a TGS request for the target server http/foo.contoso.com, the account admin@CONTOSO.COM did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 9). For WSUS instructions, seeWSUS and the Catalog Site. 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. I'd prefer not to hot patch. But there's also the problem of maintaining 24/7 Internet access at all the business' facilities and clients. Microsoft has flagged the issue affecting systems that have installed the patch for the bug CVE-2020-17049, one of the 112 vulnerabilities addressed in the November 2020 Patch Tuesday update .. You can leverage the same 11b checker script mentioned above to look for most of these problems. 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). All users are able to access their virtual desktops with no problems or errors on any of the components. Or is this just at the DS level? 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 said it won't be offering an Extended Security Update (ESU) program for Windows 8.1, instead urging users to upgrade to Windows 11. That one is also on the list. Event log: SystemSource: Security-KerberosEvent ID: 4. To avoid redundancy, I will briefly cover a very important attribute called msDS-SupportedEncryptionTypes on objectClasses of User. Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext converts the data back into its original form, called plaintext. (Another Kerberos Encryption Type mismatch)Resolution: Analyze the DC, the service account that owns the SPN, and the client to determine why the mismatch is occurring. If yes, authentication is allowed. After installing KB5018485 or later updates, you might be unable to reconnect to Direct Access after temporarily losing network connectivity or transitioning between Wi-Fi networks or access points. Meanwhile businesses are getting sued for negligence for failing to patch, even if those patches might break more than they fix. 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. I'm also not about to shame anyone for turning auto updates off for their personal devices. Setting: "Network security: Configure encryption types allowed for Kerberos" Needs to be "not configured" or if Enabled, needs to have RC4 as Enabled; have AES128/AES256/Future Encryption types enabled as well, But the issue with the patch is that it disables everything BUT RC4. Looking at the list of services affected, is this just related to DS Kerberos Authentication? This error can also happen if the target service account password is different than what is configured on the Kerberos Key Distribution Center for that target service. Ensure that the target SPN is only registered on the account used by the server. This registry key is temporary, and will no longer be read after the full Enforcement date of October 10, 2023. Redmond has also addressedsimilar Kerberos authentication problemsaffecting Windows systems caused by security updatesreleased as part of November 2020 Patch Tuesday. Explanation: If you have disabled RC4, you need to manually set these accounts accordingly, or leverage DefaultDomainSupportedEncTypes. Domains that have third-party domain controllers might see errors in Enforcement mode. 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. Can anyone recommend any sites to sign up for notifications to warn us such as what we have just witnessed with MSFT released November patches potential issues? Server: Windows Server 2008 SP2 or later, including the latest release, Windows Server 2022. 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 . 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. After installing the november update on our 2019 domain controllers, this has stopped working. 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. If a user logs in and then disconnects the session, then the VDA crashes (and reboots) exactly 10 hours after the initial login. Online discussions suggest that a number of . 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? Kerberos has replaced the NTLM protocol as the default authentication protocol for domain-connected . 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/. All service tickets without the new PAC signatures will be denied authentication. This security update addresses Kerberos vulnerabilities where an attacker could digitally alter PAC signatures, raising their privileges. See https://go.microsoft.com/fwlink/?linkid=2210019 to learn more. You need to read the links above. If the signature is either missing or invalid, authentication is allowed and audit logs are created. Audit mode will be removed in October 2023, as outlined in theTiming of updates to address Kerberos vulnerabilityCVE-2022-37967 section. 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. The accounts available etypes : 23. For more information about how to do this, see theNew-KrbtgtKeys.ps1 topic on the GitHub website. 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. Client : /. 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. "4" is not listed in the "requested etypes" or "account available etypes" fields. 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. The target name used was HTTP/adatumweb.adatum.com. STEP 1: UPDATE Deploy the November 8, 2022 or later updates to all applicable Windows domain controllers (DCs). See the previous questionfor more information why your devices might not have a common Kerberos Encryption type after installing updates released on or afterNovember 8, 2022. 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. You can manually import these updates into Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager. "This issue might affect any Kerberos authentication in your environment," Microsoft wrote in its Windows Health Dashboard at the time, adding that engineers were trying to resolve the problem. Continuing to use Windows 8.1 beyond January 10, 2023, may raise an organization's susceptibility to security threats or hinder its ability to comply with regulatory requirements, the firm said. All of the events above would appear on DCs. Should I not patch IIS, RDS, and Files Servers? Identify areas that either are missing PAC signatures or have PAC Signatures that fail validation through the Event Logs triggered during Audit mode. 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. 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