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Black Hat Ethical Hacking
Windows Kerberos authentication breaks after November updates

Windows Kerberos authentication breaks after November updatesPost Views: 1 Premium Contenthttps://www.blackhatethicalhacking.com/wp-content/uploads/2022/09/Patreon.png Subscribe to Patreon to watch this episode.
Reading Time: 3 Minutes 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.Kerberos has replaced the NTLM protocol as the default authentication protocol for domain-connected devices on all Windows versions above Windows 2000.

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.”

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 Domain Controller role, you might have issues with Kerberos authentication,” Microsoft explained.

“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.”

Errors logged in system event logs on impacted systems will be tagged with a “the missing key has an ID of 1” keyphrase.
“While processing an AS request for target service Affects both client and server platformsThe complete list of affected platforms includes both client and server releases:

* Client: Windows 7 SP1, Windows 8.1, Windows 10 Enterprise LTSC 2019, Windows 10 Enterprise LTSC 2016, Windows 10 Enterprise 2015 LTSB, Windows 10 20H2 or later, and Windows 11 21H2 or later
* Server: Windows Server 2008 SP2 or later, including the latest release, Windows Server 2022.

While Microsoft has started enforcing security hardening for Netlogon and Kerberos beginning with the November 2022 Patch Tuesday, the company says this known issue is not an expected result.

The issue does not impact devices used by home customers and those that aren’t enrolled in an on-premises domain. Also, it doesn’t impact mom-hybrid Azure Active Directory environments and those that don’t have on-premises Active Directory servers.
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Microsoft is working on a fix for this known issue and estimates that a solution will be available in the coming weeks.

Redmond has also addressed similar Kerberos authentication problems affecting W[...]

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Black Hat Ethical Hacking Windows Kerberos authentication breaks after November updates Windows Kerberos authentication breaks after November updatesPost Views: 1 Premium Contenthttps://www.blackhatethicalhacking.com/wp-content/uploads/2022/09/Patreon.png…
indows systems caused by security updates released as part of November 2020 Patch Tuesday.
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