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V-278023

CAT II (Medium)

Windows Server 2025 must not have the Server Message Block (SMB) v1 protocol installed.

Rule ID

SV-278023r1182034_rule

STIG

Microsoft Windows Server 2025 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000381

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 and is not FIPS compliant.

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Different methods are available to disable SMBv1 on Windows Server 2025. This is the preferred method, however if WN25-00-000390 and WN25-00-000400 are configured, this is not applicable.

Open Windows PowerShell with elevated privileges (run as administrator).

Enter "Get-WindowsFeature -Name FS-SMB1".

If "Installed State" is "Installed", this is a finding.

An Installed State of "Available" or "Removed" is not a finding.

Fix Text

Uninstall the SMBv1 protocol.

Open Windows PowerShell with elevated privileges (run as administrator).

Enter "Uninstall-WindowsFeature -Name FS-SMB1 -Restart".
(Omit the Restart parameter if an immediate restart of the system cannot be done.)

Alternately:

Start Server Manager.

Select the server with the feature.

Scroll down to "ROLES AND FEATURES" in the right pane.

Select "Remove Roles and Features" from the drop-down "TASKS" list.

Select the appropriate server on the "Server Selection" page and click "Next".

Deselect "SMB 1.0/CIFS File Sharing Support" on the "Features" page.

Click "Next" and "Remove" as prompted.