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WN25-CC-000070 Windows Server 2025 insecure logons to an SMB server must be disabled.

DISA STIG library V1R4
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

Windows Server 2025 insecure logons to an SMB server must be disabled.

Control

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)

Discussion

Insecure guest logons allow unauthenticated access to shared folders. Shared resources on a system must require authentication to establish proper access.

Related controls

CCI-000366

Fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Lanman Workstation >> Enable insecure guest logons to "Disabled".