The system will be configured to prevent users from mapping local COM ports and redirecting data from the Remote Desktop Session Host to local COM ports. (Remote Desktop Services Role)

From Windows Server 2008 R2 Member Server Security Technical Implementation Guide

Part of TS/RDS – COM Port Redirection

Associated with: CCI-002314

SV-32501r1_rule The system will be configured to prevent users from mapping local COM ports and redirecting data from the Remote Desktop Session Host to local COM ports. (Remote Desktop Services Role)

Vulnerability discussion

This check verifies that the system is configured to prevent users from mapping local COM ports and redirecting data from the Remote Desktop Session Host to local COM ports.

Check content

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: fDisableCcm Type: REG_DWORD Value: 1

Fix text

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”.

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