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V-224857

CAT II (Medium)

The Server Message Block (SMB) v1 protocol must be disabled on the SMB server.

Rule ID

SV-224857r958478_rule

STIG

Microsoft Windows Server 2016 Security Technical Implementation Guide

Version

V2R10

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 as well as not being FIPS compliant.

Check Content

Different methods are available to disable SMBv1 on Windows 2016, if V-73299 is configured, this is NA.

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\

Value Name: SMB1

Type: REG_DWORD
Value: 0x00000000 (0)

Fix Text

Configure the policy value for Computer Configuration >> Administrative Templates >> MS Security Guide >> "Configure SMBv1 Server" to "Disabled".

The system must be restarted for the change to take effect.

This policy setting requires the installation of the SecGuide custom templates included with the STIG package. "SecGuide.admx" and "SecGuide.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.