Windows Server admins say latest Patch Tuesday broke authentication policies

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IT directors are reporting authentication issues following installing the most modern May 2022 Patch Tuesday security updates, introduced this week.

On-line conversations advise that a variety of enterprises are knowledge issues, especially people that set up the updates on Windows Servers that also serve the domain controller (DC) and Energetic Listing Certification Products and services (ACDS) roles.

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According to some admins, Network Plan Server (NPS) procedures were reported to be failing, returning an error which examine that ‘authentication unsuccessful thanks to a consumer credential mismatch. Possibly the user name furnished does not map to an present account or the password was incorrect’.

Others said their Windows Server, which was serving only the DC part, not the ACDS function way too, expert the identical issues with failing NPS insurance policies. Removing the KB5013941 update reportedly set the issue.

1 person documented that in their natural environment they run separate servers for DC and NPS, and came to the conclusion that the NPS servers might be patchable, but DC servers may well require to have the update rolled again, following testing the updates on every.

“FYI we’re conscious of the NPS issue,” reported Steve Syfuhs, senior software program engineer concentrating on cryptography, authentication, and id at Microsoft. “It’s not connected to NPS precisely but alternatively with how we’re distinguishing amongst distinct varieties of names in the certificates. Only a subset of individuals are affected by this.”

Syfuhs dealt with people in a different Twitter dialogue and verified that Microsoft is searching into the issues that are being noted by numerous IT admins.

FYI we’re investigating the reviews

— Steve Syfuhs (@SteveSyfuhs) May well 11, 2022

“After installing updates released May 10, 2022 on your area controllers, you may see authentication failures on the server or shopper for services these as Network Policy Server (NPS), Routing and Remote access Provider (RRAS), Radius, Extensible Authentication Protocol (EAP), and Guarded Extensible Authentication Protocol (PEAP),” Microsoft reported in an issues doc. “An issue has been observed similar to how the mapping of certificates to device accounts is getting dealt with by the domain controller.”

The issues at present skilled by Windows Server directors are thanks to the way in which Microsoft preset two ‘high severity’ privilege escalation vulnerabilities, tracked as CVE-2022-26931 and CVE-2022-26923, in Tuesday’s round of month to month security fixes.

Online conversations in the early hrs following the security patches have been released appeared to exhibit people had been in a position to utilize the updates with no issues, only for Windows Server issues to emerge afterwards.

Previously this 12 months, many Windows Server administrators collectively agreed to forgo the security patches issued by Microsoft, citing quite a few issues that led to operational disruption so severe that they considered they have been superior still left unprotected from the security patches than to update and utilize workarounds.

Microsoft has issued a advisable mitigation for admins who want a workaround to the issue with the certificates but do not want to roll back again the hottest update as others currently have done, leaving by themselves unprotected.

The workaround requires manually mapping certificates to a machine account in Lively Listing, Microsoft said. If the advisable mitigation does not get the job done, admins are inspired to study the linked aid doc for other opportunity solutions to solve the issues they are going through.