KB5020805, KB5021130, KB5021131 with Windows 2003 still works

ComputerHabit 826 Reputation points
2023-05-05T18:01:39.0133333+00:00

I am working on some KB articles about upcoming Kerberos changes.

KB5020805: How to manage Kerberos protocol changes related to CVE-2022-37967 - Microsoft Support
https://support.microsoft.com/en-us/topic/kb5020805-how-to-manage-kerberos-protocol-changes-related-to-cve-2022-37967-997e9acc-67c5-48e1-8d0d-190269bf4efb

KB5021130: How to manage the Netlogon protocol changes related to CVE-2022-38023 - Microsoft Support
https://support.microsoft.com/en-us/topic/kb5021130-how-to-manage-the-netlogon-protocol-changes-related-to-cve-2022-38023-46ea3067-3989-4d40-963c-680fd9e8ee25

KB5021131: How to manage the Kerberos protocol changes related to CVE-2022-37966 - Microsoft Support
https://support.microsoft.com/en-us/topic/kb5021131-how-to-manage-the-kerberos-protocol-changes-related-to-cve-2022-37966-fd837ac3-cdec-4e76-a6ec-86e67501407d

The article mentions issues with Windows 2003 systems.
In lab I have setup a domain and have 2003 systems added.
I have applied all the registry changes that are to be the new "Default"

KB5020805
#enforce
New-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\KDC" -Name KrbtgtFullPacSignature -Value 0X3 -PropertyType DWORD –Force
KB5021130
#Enforced
New-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\Netlogon\Parameters" -Name RequireSeal -Value 0X2 -PropertyType DWORD –Force
KB5021131
#Default
New-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\KDC" -Name DefaultDomainSupportedEncTypes -Value 0X27 -PropertyType DWORD –Force

My 2003 boxes can still login.

Am I missing something or will 2003 Servers continue to work?

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4 answers

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  1. Limitless Technology 44,046 Reputation points
    2023-05-09T14:52:17.4533333+00:00

    Hello ComputerHabit,

    Thank you for your question and for reaching out with your question today.

    If your 2003 servers are still working with Kerberos, then great. It is highly recommended that 2003 servers should be upgraded wherever possible as they are well outside of Microsoft support now.

    If the reply was helpful, please don’t forget to upvote or accept as answer.


  2. ComputerHabit 826 Reputation points
    2023-05-10T16:11:09.9566667+00:00

    Anyone else have some details?


  3. Talevi, Flavio 0 Reputation points
    2023-07-26T17:20:39.78+00:00

    i understand windows server 2008 or higher will work.

    This feature KrbtgtFullPacSignature was addedd in 2022, when no more codes for windows server 2003 (windows Server 2008 and Windows 7 has ESU by that time).

    i just raise a ticket with Microsoft. lets see what they will reply.


  4. ComputerHabit 826 Reputation points
    2024-01-08T16:18:29.4033333+00:00

    It's a new year. These changes were supposed to be in effect already.

    I have a LAB with fully patched 2012 R2 DC's. Windows 2003 continues to authenticate against the domain.

    So far I feel like I'm either missing something or Microsoft just blew a bunch of smoke for nothing.

    I still feel like MS could have written these articles better and have been more clear.