STIG ID: WN16-MS-000030 | SRG: SRG-OS-000095-GPOS-00049 | Severity: medium | CCI: | Vulnerability Id: V-225009
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.
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> "Enumerate local users on domain-joined computers" to "Disabled".
This applies to member servers. For domain controllers and standalone or nondomain-joined 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)