CIS Microsoft Windows 10 Enterprise Release 1909 Benchmark

18.9.59.3.3.3 (L2) Ensure 'Do not allow LPT port redirection' is set to 'Enabled' (Scored)

ProfileApplicability:

 Level 2 (L2) - High Security/Sensitive Data Environment (limited functionality)

Description:

This policy setting specifies whether to prevent the redirection of data to client LPTports during a Remote Desktop Services session.

The recommended state for this setting is: Enabled .

Rationale:

In a more security-sensitive environment, it is desirable to reduce the possible attack surface. The need for LPTport redirection within a Remote Desktop session is very rare, so makes sense to reduce the number of unexpected avenues for data exfiltration and/or malicious code transfer.

Audit:

Navigate to the UI Path articulated in the Remediation section and confirm it is set as prescribed. This group policy setting is backed by the following registry location:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services:fDisableLPT

Remediation:

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

Computer Configuration\Policies\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Device and Resource Redirection\Do not allow LPT port redirection

Note: This Group Policy path is provided by the Group Policy template TerminalServer.admx/adml that is included with all versions of the Microsoft Windows Administrative Templates.

Impact:

Users in a Remote Desktop Services session will not be able to redirect server data to local (client) LPT ports.

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