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The macOS system must be configured to disable Bonjour multicast advertising.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230790 APPL-11-002005 SV-230790r599842_rule Medium
Description
To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the operating system must support the organizational requirements, providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or to address authorized quality of life issues. Bonjour multicast advertising must be disabled on the system.
STIG Date
Apple macOS 11 (Big Sur) Security Technical Implementation Guide 2022-02-16

Details

Check Text ( C-33735r648708_chk )
To check that Bonjour broadcasts have been disabled, use the following command:

/usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep NoMulticastAdvertisements

If the return is not, "NoMulticastAdvertisements = 1", this is a finding.
Fix Text (F-33708r607258_fix)
This setting is enforced using the "Custom Policy" configuration profile.