RC4-HMAC (RC4) is a variable key-length symmetric encryption algorithm. Microsoft has released cumulative updates to be installed on Domain Controllers: Windows Server 2022 (KB5021656), Windows Server 2019 (KB5021655), and Windows Server 2016 (KB5021654). Asession keyhas to be strong enough to withstand cryptanalysis for the lifespan of the session. Remote Desktop connections using domain users might fail to connect. Microsoft released a standalone update as an out-of-band patch to fix this issue. If the signature is present, validate it. BleepingComputer readers also reported three days ago thatthe November updates breakKerberos"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.". 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. 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. If I don't patch my DCs, am I good? Moving to Enforcement mode with domains in the 2003 domain functional level may result in authentication failures. Since Patch Tuesday this month, Microsoft has already confirmed a Direct Access connectivity issue in various versions of Windows (which it sort of fixed by rolling back the update), now the. Adds measures to address security bypass vulnerability in the Kerberos protocol. 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 list of Kerberos authentication scenarios includes but is not limited to the following: The complete list of affected platforms includes both client and server releases: While Microsoft hasstarted enforcing security hardeningfor Netlogon and Kerberos beginning with the November 2022 Patch Tuesday, the company says this known issue is not an expected result. This indicates that the target server failed to decrypt the ticket provided by the client. Werecommendthat Enforcement mode is enabled as soon as your environment is ready. The solution is to uninstall the update from your DCs until Microsoft fixes the patch. Microsoft advised customers to update to Windows 11 in lieu of providing ESU software for Windows 8.1. If the signature is missing, raise an event and allow the authentication. To help protect your environment and prevent outages, we recommend that you do the following steps: UPDATEyour Windows domain controllers with a Windowsupdate released on or after November 8, 2022. Blog reader EP has informed me now about further updates in this comment. 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. If you find this error, you likely need to reset your krbtgt password. Microsoft is investigating an issue causing authentication errors for certain Windows services following its rollout of updates in this month's Patch Tuesday. 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. Explanation: If are trying to enforce AES anywhere in your environments, these accounts may cause problems. TACACS: Accomplish IP-based authentication via this system. 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. You'll want to leverage the security logs on the DC throughout any AES transition effort looking for RC4 tickets being issued. After installing Windows Updates released on November 8, 2022 on Windows domain controllers, you might have issues with Kerberos authentication. Windows Server 2022: KB5021656 Monthly Rollup updates are cumulative and include security and all quality updates. 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 . KDCsare integrated into thedomain controllerrole. The whole thing will be carried out in several stages until October 2023. If a service ticket has invalid PAC signatureor is missing PAC signatures, validation will fail and an error event will be logged. The script is now available for download from GitHub atGitHub - takondo/11Bchecker. 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. Note that this out-of-band patch will not fix all issues. List of out-of-band updates with Kerberos fixes Workaround from MSFT engineer is to add the following reg keys on all your dcs. STEP 1: UPDATE Deploy the November 8, 2022 or later updates to all applicable Windows domain controllers (DCs). DIGITAL CONTENT CREATOR Explanation: If you have disabled RC4, you need to manually set these accounts accordingly, or leverage DefaultDomainSupportedEncTypes. Client : /, The Key Distribution Center (KDC) encountered a ticket that did not contained the full PAC Signature. For example: Set msds-SupportEncryptionTypes to 0 to let domain controllers use the default value of 0x27. End-users may notice a delay and an authentication error following it. If this extension is not present, authentication is allowed if the user account predates the certificate. 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. 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. If you still have RC4 enabled throughout the environment, no action is needed. If you obtained a version previously, please download the new version. For more information about Kerberos Encryption types, see Decrypting the Selection of Supported Kerberos Encryption Types. "When this issue is encountered you might receive a Microsoft-Windows-Kerberos-Key-Distribution-Center Event ID 14 error event in the System section of Event Log on your Domain Controller with the below text.". After installing updates released on or after November 8, 2022 on your domain controllers, all devices must support AES ticket signing as required to be compliant with the security hardening required for CVE-2022-37967. Make sure they accept responsibility for the ensuing outage. The accounts available etypes: . If yes, authentication is allowed. The known issue, actively investigated by Redmond, can affect any Kerberos authentication scenario within affected enterprise environments. 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. 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. 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. For information about protocol updates, see the Windows Protocol topic on the Microsoft website. Afflicted systems prompted sysadmins with the message: "Authentication failed due to a user . 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. From Reddit: This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Authentication protocols enable authentication of users, computers, and services, making it possible for authorized services and users to access resources in a secure manner. A special type of ticket that can be used to obtain other tickets. Kerberos authentication essentially broke last month. Windows Server 2008 R2 SP1: This update is not yet available but should be available in a week 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. ENABLEEnforcement mode to addressCVE-2022-37967in your environment. 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. The requested etypes were 18 17 23 24 -135. If you have already installed updates released on or after November 8, 2022, you can detect devices which do not have a common Kerberos Encryption type by looking in the Event Log for Microsoft-Windows-Kerberos-Key-Distribution-Center Event 27, which identifies disjoint encryption types between Kerberos clients and remote servers or services. More information on potential issues that could appear after installing security updates to mitigate CVE-2020-17049 can be found here. Keep in mind the following rules/items: If you have other third-party Kerberos clients (Java, Linux, etc.) 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). This is on server 2012 R2, 2016 and 2019. Windows 10 servicing stack update - 19042.2300, 19044.2300, and 19045.2300. Once the Windows domain controllers are updated, switch to Audit mode by changing the KrbtgtFullPacSignaturevalue to 2. Authentication protocols enable. It is a network service that supplies tickets to clients for use in authenticating to services. For the standalone package of the OOB updates, users can search for the KB number in the Microsoft Update Catalog and manually import the fixes into Windows Server Update Services (see the instructions here) and Endpoint Configuration Manager (instructions here). The Windows updates released on or after October 10, 2023 will do the following: Removes support for the registry subkey KrbtgtFullPacSignature. This registry key is used to gate the deployment of the Kerberos changes. 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. You can manually import these updates into Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager.
You might be unable to access shared folders on workstations and file shares on servers. You will need to verify that all your devices have a common Kerberos Encryption type. Click Select a principal and enter the startup account mssql-startup, then click OK. To mitigate the issues, you will need to investigate your domain further to find Windows domain controllers that are not up to date. 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. As I understand it most servers would be impacted; ours are set up fairly out of the box. 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. The target name used was HTTP/adatumweb.adatum.com. Event ID 14 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 5). Microsoft releases another document, explaining further details related to the authentication problem caused by the security update addressing the privilege escalation vulnerabilities in Windows . If the script returns a large number of objects in the Active Directory domain, then it would be best to add the encryption types needed via another Windows PowerShell command below: Set-ADUser [sAMAccountName] -KerberosEncryptionType [CommaSeparatedListOfEtypes], Set-ADComputer [sAMAccountName] -KerberosEncryptionType [CommaSeparatedListOfEtypes], Set-ADServiceAccount [sAMAccountName] -KerberosEncryptionType [CommaSeparatedListOfEtypes]. Security updates behind auth issues. "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.". KDCsare integrated into thedomain controllerrole. Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext converts the data back into its original form, called plaintext. 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." I'm also not about to shame anyone for turning auto updates off for their personal devices. Deploy the November 8, 2022 or later updates to all applicable Windows domain controllers (DCs). 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. Therequested etypes: . The accounts available etypes : 23. Client : /. TheKeyDistributionCenter(KDC)encounteredaticketthatitcouldnotvalidatethe
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