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Users must be prevented from mapping local COM ports and redirecting data from the Remote Desktop Session Host to local COM ports. (Remote Desktop Services Role).


Overview

Finding ID Version Rule ID IA Controls Severity
V-15997 WN12-CC-000132 SV-52224r2_rule ECSC-1 Medium
Description
Preventing the redirection of Remote Desktop session data to a client computer's COM ports helps reduce possible exposure of sensitive data.
STIG Date
Windows Server 2012 / 2012 R2 Domain Controller Security Technical Implementation Guide 2016-12-19

Details

Check Text ( C-46967r1_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: fDisableCcm

Type: REG_DWORD
Value: 1
Fix Text (F-45242r2_fix)
Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Device and Resource Redirection -> "Do not allow COM port redirection" to "Enabled".