Details
Avahi is a free zeroconf implementation, including a system for multicast DNS/DNS-SD service discovery. Avahi allows programs to publish and discover services and hosts running on a local network with no specific configuration. For example, a user can plug a computer into a network and Avahi automatically finds printers to print to, files to look at and people to talk to, as well as network services running on the machine.
Rationale:
Automatic discovery of network services is not normally required for system functionality. It is recommended to disable the service to reduce the potential attack surface.
Solution
Run the following command to disable avahi-daemon:
# systemctl –now disable avahi-daemon
Additional Information:
Additional methods of disabling a service exist. Consult your distribution documentation for appropriate methods.
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: System and Information Integrity.This control applies to the following type of system Unix.