5.22 (L2) Ensure 'Remote Desktop Services UserMode Port Redirector (UmRdpService)' is set to 'Disabled'

Information

Allows the redirection of Printers/Drives/Ports for RDP connections.

The recommended state for this setting is: Disabled

In a security-sensitive environment, it is desirable to reduce the possible attack surface - preventing the redirection of COM, LPT and PnP ports will reduce the number of unexpected avenues for data exfiltration and/or malicious code transfer within an RDP session.

Solution

To establish the recommended configuration via GP, set the following UI path to: Disabled

Computer Configuration\Policies\Windows Settings\Security Settings\System Services\Remote Desktop Services UserMode Port Redirector

Impact:

Printers, drives and ports (COM, LPT, PnP, etc.) will not be allowed to be redirected inside RDP sessions.

See Also

https://workbench.cisecurity.org/benchmarks/16515