Title

Windows Server 2019 local users on domain-joined member servers must not be enumerated. (Cat II impact)

Discussion

The username is one part of logon credentials that could be used to gain access to a system. Preventing the enumeration of users limits this information to authorized personnel.

Check Content

This applies to member servers. For domain controllers and standalone systems, this is NA. If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\Windows\System\ Value Name: EnumerateLocalUsers Type: REG_DWORD Value: 0x00000000 (0)

Fix Text

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> "Enumerate local users on domain-joined computers" to "Disabled".

Additional Identifiers

Rule ID: SV-205696r569188_rule

Vulnerability ID: V-205696

Group Title: SRG-OS-000095-GPOS-00049

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.