The Server Message Block (SMB) v1 protocol must be uninstalled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-73299	WN16-00-000410	SV-87951r2_rule		Medium

Description
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.

STIG	Date
Windows Server 2016 Security Technical Implementation Guide	2018-09-05

Details

Check Text ( C-77761r1_chk )
Different methods are available to disable SMBv1 on Windows 2016. This is the preferred method, however if V-78123 and V-78125 are configured, this is NA. 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 (F-84915r1_fix)
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.

Fix Text (F-84915r1_fix)

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.