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The cups
service can be disabled with the following command:
$ sudo systemctl mask --now cups.service
Rationale
Turn off unneeded services to reduce attack surface.
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'
"$SYSTEMCTL_EXEC" stop 'cups.service'
"$SYSTEMCTL_EXEC" disable 'cups.service'
"$SYSTEMCTL_EXEC" mask 'cups.service'
# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files cups.socket; then
"$SYSTEMCTL_EXEC" stop 'cups.socket'
"$SYSTEMCTL_EXEC" mask 'cups.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 'cups.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 the CUPS 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:
- NIST-800-53-CM-6(a)
- NIST-800-53-CM-7(a)
- NIST-800-53-CM-7(b)
- disable_strategy
- low_complexity
- low_disruption
- no_reboot_needed
- service_cups_disabled
- unknown_severity
- name: Disable the CUPS Service - Ensure cups.service is Masked
ansible.builtin.systemd:
name: cups.service
state: stopped
enabled: false
masked: true
when:
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
- service_exists.stdout_lines is search("cups.service", multiline=True)
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
- no_reboot_needed
- service_cups_disabled
- unknown_severity
- name: Unit Socket Exists - cups.socket
ansible.builtin.command: systemctl -q list-unit-files cups.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:
- NIST-800-53-CM-6(a)
- NIST-800-53-CM-7(a)
- NIST-800-53-CM-7(b)
- disable_strategy
- low_complexity
- low_disruption
- no_reboot_needed
- service_cups_disabled
- unknown_severity
- name: Disable the CUPS Service - Disable Socket cups
ansible.builtin.systemd:
name: cups.socket
enabled: false
state: stopped
masked: true
when:
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
- socket_file_exists.stdout_lines is search("cups.socket", multiline=True)
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
- no_reboot_needed
- service_cups_disabled
- unknown_severity