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WN25-00-000390 Windows Server 2025 must have the Server Message Block (SMB) v1 protocol disabled on the SMB server.

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

Maps to CM-7 via CCI-000381

Title

Windows Server 2025 must have the Server Message Block (SMB) v1 protocol disabled on the SMB server.

Control

Different methods are available to disable SMBv1 on Windows Server 2025, if WN25-00-000380 is configured, 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: \SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\ Value Name: SMB1 Type: REG_DWORD Value: 0x00000000 (0)

Discussion

SMBv1 is a legacy protocol that uses the MD5 algorithm as part of SMB. MD5 is known to be vulnerable to a number of attacks such as collision and preimage attacks, as well as not being FIPS compliant.

Related controls

CCI-000381

Fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MS Security Guide >> Configure SMBv1 Server to "Disabled". Restart the system for the change to take effect. This policy setting requires the installation of the SecGuide custom templates included with the STIG package. "SecGuide.admx" and "SecGuide.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.