The Remote Desktop Session Host will require secure RPC communications.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4447	5.103	SV-32499r1_rule	ECSC-1	Medium

Description
Allowing unsecure RPC communication exposes the server 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.

Description

Allowing unsecure RPC communication exposes the server 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.

STIG	Date
Windows Server 2008 R2 Member Server Security Technical Implementation Guide	2012-07-02

Details

Check Text ( C-32899r1_chk )
If the following registry value doesn’t exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Subkey: \Software\Policies\Microsoft\Windows NT\Terminal Services\ Value Name: fEncryptRPCTraffic Type: REG_DWORD Value: 1

Fix Text (F-28899r1_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”.