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Windows Server 2019 Remote Desktop Services must require secure Remote Procedure Call (RPC) communications.


Overview

Finding ID Version Rule ID IA Controls Severity
V-92971 WN19-CC-000370 SV-103059r1_rule Medium
Description
Allowing unsecure RPC communication exposes the system to man-in-the-middle attacks and data disclosure attacks. A man-in-the-middle attack occurs when an intruder captures packets between a client and server and modifies them before allowing the packets to be exchanged. Usually the attacker will modify the information in the packets in an attempt to cause either the client or server to reveal sensitive information. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000250-GPOS-00093
STIG Date
Windows Server 2019 Security Technical Implementation Guide 2020-06-15

Details

Check Text ( C-92289r1_chk )
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: fEncryptRPCTraffic

Type: REG_DWORD
Value: 0x00000001 (1)
Fix Text (F-99217r1_fix)
Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Session Host >> Security >> "Require secure RPC communication" to "Enabled".