Remove the GDM Package Group
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Description
By removing the gdm3 package, the system no longer has GNOME installed
installed. If X Windows is not installed then the system cannot boot into graphical user mode.
This prevents the system from being accidentally or maliciously booted into a graphical.target
mode. To do so, run the following command:
Rationale
Unnecessary service packages must not be installed to decrease the attack surface of the system.
A graphical environment is unnecessary for certain types of systems including a virtualization
hypervisor.
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 dpkg-query --show --showformat='${db:Status-Status}\n' 'gdm3' 2>/dev/null | grep -q installed; then
# CAUTION: This remediation script will remove gdm3
# from the system, and may remove any packages
# that depend on gdm3. Execute this
# remediation AFTER testing on a non-production
# system!
DEBIAN_FRONTEND=noninteractive apt-get remove -y "gdm3"
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: Gather the package facts
package_facts:
manager: auto
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_gdm_removed
- name: Ensure gdm3 is removed
package:
name: gdm3
state: absent
when: '"gdm3" in ansible_facts.packages'
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_gdm_removed
