Microsoft Windows Server 2025
Windows Server 2025 Remote Desktop Services must require secure Remote Procedure Call (RPC) communications
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
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: fEncryptRPCTraffic
Type: REG_DWORD
Value: 0x00000001 (1)
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".