Disable Bluetooth Service
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Description
The bluetooth service can be disabled with the following command:
$ sudo systemctl mask --now bluetooth.service
$ sudo service bluetooth stop
Rationale
Disabling the bluetooth service prevents the system from attempting
connections to Bluetooth devices, which entails some security risk.
Nevertheless, variation in this risk decision may be expected due to the
utility of Bluetooth connectivity and its limited range.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then
SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" stop 'bluetooth.service'
"$SYSTEMCTL_EXEC" disable 'bluetooth.service'
"$SYSTEMCTL_EXEC" mask 'bluetooth.service'
# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files bluetooth.socket; then
"$SYSTEMCTL_EXEC" stop 'bluetooth.socket'
"$SYSTEMCTL_EXEC" mask 'bluetooth.socket'
fi
# The service may not be running because it has been started and failed,
# so let's reset the state so OVAL checks pass.
# Service should be 'inactive', not 'failed' after reboot though.
"$SYSTEMCTL_EXEC" reset-failed 'bluetooth.service' || true
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Disable Bluetooth Service - Collect systemd Services Present in the System
ansible.builtin.command: systemctl -q list-unit-files --type service
register: service_exists
changed_when: false
failed_when: service_exists.rc not in [0, 1]
check_mode: false
when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- CCE-27328-4
- NIST-800-171-3.1.16
- NIST-800-53-AC-18(3)
- NIST-800-53-AC-18(a)
- NIST-800-53-CM-6(a)
- NIST-800-53-CM-7(a)
- NIST-800-53-CM-7(b)
- NIST-800-53-MP-7
- disable_strategy
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- service_bluetooth_disabled
- name: Disable Bluetooth Service - Ensure "bluetooth.service" is Masked
ansible.builtin.systemd:
name: bluetooth.service
state: stopped
enabled: false
masked: true
when:
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
- service_exists.stdout_lines is search("bluetooth.service",multiline=True)
tags:
- CCE-27328-4
- NIST-800-171-3.1.16
- NIST-800-53-AC-18(3)
- NIST-800-53-AC-18(a)
- NIST-800-53-CM-6(a)
- NIST-800-53-CM-7(a)
- NIST-800-53-CM-7(b)
- NIST-800-53-MP-7
- disable_strategy
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- service_bluetooth_disabled
- name: Unit Socket Exists - bluetooth.socket
ansible.builtin.command: systemctl -q list-unit-files bluetooth.socket
register: socket_file_exists
changed_when: false
failed_when: socket_file_exists.rc not in [0, 1]
check_mode: false
when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- CCE-27328-4
- NIST-800-171-3.1.16
- NIST-800-53-AC-18(3)
- NIST-800-53-AC-18(a)
- NIST-800-53-CM-6(a)
- NIST-800-53-CM-7(a)
- NIST-800-53-CM-7(b)
- NIST-800-53-MP-7
- disable_strategy
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- service_bluetooth_disabled
- name: Disable socket bluetooth
ansible.builtin.systemd:
name: bluetooth.socket
enabled: 'no'
state: stopped
masked: 'yes'
when:
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
- socket_file_exists.stdout_lines is search("bluetooth.socket",multiline=True)
tags:
- CCE-27328-4
- NIST-800-171-3.1.16
- NIST-800-53-AC-18(3)
- NIST-800-53-AC-18(a)
- NIST-800-53-CM-6(a)
- NIST-800-53-CM-7(a)
- NIST-800-53-CM-7(b)
- NIST-800-53-MP-7
- disable_strategy
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- service_bluetooth_disabled
