Windows Server 2019 insecure logons to an SMB server must be disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-205861 | WN19-CC-000070 | SV-205861r991589_rule | Medium |
| Description |
| Insecure guest logons allow unauthenticated access to shared folders. Shared resources on a system must require authentication to establish proper access. |
| STIG | Date |
| Microsoft Windows Server 2019 Security Technical Implementation Guide | 2025-01-15 |
Details
| Check Text (C-6126r355945_chk) |
| 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\LanmanWorkstation\ Value Name: AllowInsecureGuestAuth Type: REG_DWORD Value: 0x00000000 (0) |
| Fix Text (F-6126r355946_fix) |
| Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Lanman Workstation >> "Enable insecure guest logons" to "Disabled". |