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We are working to address this known issue,' it says. 'Note that following our original guidance of using the 0 setting could cause known issues with the S4USelf feature of Kerberos. Then admins need to complete the deployment to all DCs вЂ“ and Read-Only DCs. It has recommended admins locate the KDC registry subkey, and if it exists on the system, ensure that it is set to 1. Microsoft has also revised its guidance for deploying the update.

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'We are working on a resolution and will provide an update as soon as more information is available,' Microsoft notes.

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With that setting, admins could also see failures in 'cross-realm referrals' on Windows and non-Windows devices for Kerberos referral tickets passing through DCs that haven't got the Patch Tuesday update. SEE: Microsoft goes big in security bug bounties: Its $13.7m is double Google's 2019 payouts 'Setting the value to 0 might cause authentication issues when using S4U scenarios, such as scheduled tasks, clustering, and services for example line-of-business applications,' Microsoft states.ДЄdditionally, the default value setting of 1 might cause non-Windows clients authenticating to Windows Domains using Kerberos to experience authentication issues. Microsoft explains there are three registry setting values вЂ“ 0, 1, and 2 вЂ“ for PerformTicketSignature to control it, but admins might encounter different issues with each setting. Microsoft addressed the vulnerability by changing how the KDC validates service tickets used with the Kerberos Constrained Delegation (KCD) because there was a bypass issue in the way KDC determines if a service token can be used for KCD delegation.

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The buggy patch only affects Windows Servers, Windows 10 devices and applications in enterprise environments, according to Microsoft. 'This is caused by an issue in how CVE-2020-17049 was addressed in these updates.' 'After installing KB4586786 on domain controllers (DCs) and read-only domain controllers (RODCs) in your environment, you might encounter Kerberos authentication issues,' Microsoft notes in its known issues page for all supported version of Windows 10. SEE: Windows 10 Start menu hacks (TechRepublic Premium) Microsoft attempted to fix a bypass in the Kerberos KDC, a feature that handles tickets for encrypting messages between a server and client. Kerberos is a client-server authentication protocol used on multiple operating systems, including Windows. 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. Windows 11: Everything you need to know (ZDNet YouTube).The ultimate Windows 10 information hub: Everything you need in one place.

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