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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 | 2019-12-12 |
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. |