Microsoft Windows Server 2025
Windows Server 2025 local users on domain-joined member servers must not be enumerated
STIG ID: WN25-MS-000030 | SRG: SRG-OS-000095-GPOS-00049 | Severity: Medium | CCI: CCI-000381 | Vulnerability ID: V-278179
Description
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
C-82709r1182283_chk
This applies to member servers. For domain controllers and stand-alone or nondomain-joined systems, this is not applicable.
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
F-82614r1181242_fix
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> Enumerate local users on domain-joined computers to "Disabled".