Uninstall avahi Server Package
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Description
If the system does not need to have an Avahi server which implements
the DNS Service Discovery and Multicast DNS protocols,
the avahi-autoipd and avahi packages can be uninstalled.
Rationale
Automatic discovery of network services is not normally required for
system functionality. It is recommended to remove this package to reduce
the potential attack surface.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
# CAUTION: This remediation script will remove avahi-daemon
# from the system, and may remove any packages
# that depend on avahi-daemon. Execute this
# remediation AFTER testing on a non-production
# system!
DEBIAN_FRONTEND=noninteractive apt-get remove -y "avahi-daemon"
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Ensure avahi-daemon is removed
package:
name: avahi-daemon
state: absent
tags:
- NIST-800-53-CM-6(a)
- NIST-800-53-CM-7(a)
- NIST-800-53-CM-7(b)
- disable_strategy
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- package_avahi_removed
