Windows Server 2019 Remote Desktop Services must be configured with the client connection encryption set to High Level.

STIG ID: WN19-CC-000380  |  SRG: SRG-OS-000033-GPOS-00014 |  Severity: medium |  CCI: CCI-000068,CCI-001453 |  Vulnerability Id: V-205637 | 

Vulnerability Discussion

Remote connections must be encrypted to prevent interception of data or sensitive information. Selecting "High Level" will ensure encryption of Remote Desktop Services sessions in both directions.

Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000250-GPOS-00093

Check

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: \SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\

Value Name: MinEncryptionLevel

Type: REG_DWORD
Value: 0x00000003 (3)

Fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Session Host >> Security >> "Set client connection encryption level" to "Enabled" with "High Level" selected.
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