The Server Message Block (SMB) v1 protocol must be disabled on Windows 2012 R2.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-73805	WN12-00-000160	SV-88471r1_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 as well as not being FIPS compliant. Disabling SMBv1 support may prevent access to file or print sharing resources with systems or devices that only support SMBv1. File shares and print services hosted on Windows Server 2003 are an example, however Windows Server 2003 is no longer a supported operating system. Some older network attached devices may only support SMBv1.

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 as well as not being FIPS compliant. Disabling SMBv1 support may prevent access to file or print sharing resources with systems or devices that only support SMBv1. File shares and print services hosted on Windows Server 2003 are an example, however Windows Server 2003 is no longer a supported operating system. Some older network attached devices may only support SMBv1.

STIG	Date
Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide	2017-02-27

Details

Check Text ( C-73893r2_chk )
This applies to Windows 2012 R2. Windows 2012 uses a different method to disable SMBv1, see WN12-00-000170 and WN12-00-000180. Run "Windows PowerShell" with elevated privileges (run as administrator). Enter the following: Get-WindowsOptionalFeature -Online \| Where FeatureName -eq SMB1Protocol If "State : Enabled" is returned, this is a finding. Alternately: Search for "Features". Select "Turn Windows features on or off". If "SMB 1.0/CIFS File Sharing Support" is selected, this is a finding.

Check Text ( C-73893r2_chk )

This applies to Windows 2012 R2. Windows 2012 uses a different method to disable SMBv1, see WN12-00-000170 and WN12-00-000180.

Run "Windows PowerShell" with elevated privileges (run as administrator).
Enter the following:
Get-WindowsOptionalFeature -Online | Where FeatureName -eq SMB1Protocol

If "State : Enabled" is returned, this is a finding.

Alternately:
Search for "Features".
Select "Turn Windows features on or off".

If "SMB 1.0/CIFS File Sharing Support" is selected, this is a finding.

Fix Text (F-80261r1_fix)
Run "Windows PowerShell" with elevated privileges (run as administrator). Enter the following: Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol Alternately: Search for "Features". Select "Turn Windows features on or off". De-select "SMB 1.0/CIFS File Sharing Support". The system must be restarted for the changes to take effect.