In March 2018, Microsoft released the CredSSP Updates for CVE-2018-0886, which is a vulnerability that could allow for remote code execution in unpatched versions of CredSSP. It would allow an attacker to relay user credentials to execute code on a target system. According to this, they initially released an update in March. Then in April they released an update that would provide a more detailed error message while using the Remote Desktop Client (RDP).

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May 11, 2018  Locate the policy with the name Encryption Oracle Remediation, enable the policy and as a parameter in the drop-down list, select Vulnerable; It remains to update the policies on the compute (run gpupdate /force command) and try to connect to the remote server via RDP. When the policy is enabled, client applications with CredSSP support will be. Oct 23, 2018  CredSSP Encryption Oracle Remediation on Server Core. Windows Server. The only reason I haven't done it is because I have several Core servers but this is my last remaining Windows Server 2012 R2 Core server. When this issue came up on my other GUI servers, I just ran windows updates and the issue was resolved.

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Then, finally, in the May 2018 Patch Tuesday, they just released an update that changed the default setting from Vulnerable to Mitigated which means that any client application that uses CredSSP will not be able to fall back to insecure versions. In other words, if you have a workstation that received the May update but a server that hasn’t received the CredSSP update, the workstation will receive the error message above when trying to RDP to that server. Recommended Fix for Authentication Error Function Not Supported CredSSP ErrorObviously to reduce the risk of the vulnerability, the recommended solution is to patch all of the servers that are missing the update.

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Unfortunately, this update does require a reboot.For more information, see the Microsoft article. Group Policy Temporary Workaround Fix for Authentication Error Function Not Supported CredSSP ErrorIf you cannot update your server right away, then the temporary workaround is to change a Group Policy. This is not recommended for a permanent solution since it means that the vulnerability could still exist on the servers. Note: Ensure that you update the Group Policy Central Store (Or if not using a Central Store, use a device with the patch applied when editing Group Policy) with the latest CredSSP.admx and CredSSP.adml. These files will contain the latest copy of the edit configuration settings for these settings.

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If you do not have a patched server with access to Group Policy, then you won’t see the necessary settings because you’ll have an older version of CredSSP.admx and CredSSP.adml. Dragon breeding games not pay to win.