Title

The Telnet Client must not be installed. (Cat II impact)

Discussion

Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.

Check Content

Open "PowerShell". Enter "Get-WindowsFeature | Where Name -eq Telnet-Client". If "Installed State" is "Installed", this is a finding. An Installed State of "Available" or "Removed" is not a finding.

Fix Text

Uninstall the "Telnet Client" feature. Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Telnet Client" on the "Features" page. Click "Next" and "Remove" as prompted.

Additional Identifiers

Rule ID: SV-224854r958480_rule

Vulnerability ID: V-224854

Group Title: SRG-OS-000096-GPOS-00050

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.