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-88471r2_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 Domain Controller Security Technical Implementation Guide	2018-09-05

Details

Check Text ( C-73893r3_chk )
This requirement applies to Windows 2012 R2, it is NA for Windows 2012 (see V-73519 and V-73523 for 2012 requirements). Different methods are available to disable SMBv1 on Windows 2012 R2. This is the preferred method, however if V-73519 and V-73523 are configured, this is NA. 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-73893r3_chk )

This requirement applies to Windows 2012 R2, it is NA for Windows 2012 (see V-73519 and V-73523 for 2012 requirements).

Different methods are available to disable SMBv1 on Windows 2012 R2. This is the preferred method, however if V-73519 and V-73523 are configured, this is NA.

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.