The macOS system must be configured to disable SMB File Sharing unless it is required.

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The macOS system must be configured to disable SMB File Sharing unless it is required.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-81507	AOSX-13-000139	SV-96221r1_rule		Medium

Description
File Sharing is usually non-essential and must be disabled if not required. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.

STIG	Date
Apple OS X 10.13 Security Technical Implementation Guide	2019-03-08

Details

Check Text ( C-81255r1_chk )
If SMB File Sharing is required, this is not applicable. To check if the SMB File Sharing service is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system \| /usr/bin/grep com.apple.smbd If the results do not show the following, this is a finding: "com.apple.smbd" => true

Fix Text (F-88331r1_fix)
To disable the SMB File Sharing service, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.smbd The system may need to be restarted for the update to take effect.