Microsoft Windows Server 2019
Windows Server 2019 must restrict remote calls to the Security Account Manager (SAM) to Administrators on domain-joined member servers and standalone or nondomain-joined systems
Description
The Windows SAM stores users' passwords. Restricting Remote Procedure Call (RPC) connections to the SAM to Administrators helps protect those credentials.
Check
This applies to member servers and standalone or nondomain-joined systems. It is NA for domain controllers.If the following registry value does not exist or is not configured as specified, this is a finding:Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SYSTEM\CurrentControlSet\Control\Lsa\Value Name: RestrictRemoteSAMValue Type: REG_SZValue: O:BAG:BAD:(A;;RC;;;BA)
Fix
Navigate to the policy Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Restrict clients allowed to make remote calls to SAM". Select "Edit Security" to configure the "Security descriptor:".Add "Administrators" in "Group or user names:" if it is not already listed (this is the default).Select "Administrators" in "Group or user names:".Select "Allow" for "Remote Access" in "Permissions for "Administrators".Click "OK".The "Security descriptor:" must be populated with "O:BAG:BAD:(A;;RC;;;BA) for the policy to be enforced.