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By removing the xorg-x11-server-common package, the system no longer has X Windows
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:
$ sudo apt_get groupremove "X Window System"
$ sudo apt_get remove xorg-x11-server-common
Unnecessary service packages must not be installed to decrease the attack surface of the system. X windows has a long history of security vulnerabilities and should not be installed unless approved and documented.
The following script can be run on the host to remediate the issue.
#!/bin/bash
# CAUTION: This remediation script will remove xserver-xorg
# from the system, and may remove any packages
# that depend on xserver-xorg. Execute this
# remediation AFTER testing on a non-production
# system!
DEBIAN_FRONTEND=noninteractive apt-get remove -y "xserver-xorg"
The following playbook can be run with Ansible to remediate the issue.
- name: Ensure xserver-xorg is removed
package:
name: xserver-xorg
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_xorg-x11-server-common_removed
The installation and use of a Graphical User Interface (GUI) increases your attack vector and decreases your overall security posture. Removing the package xorg-x11-server-common package will remove the graphical target which might bring your system to an inconsistent state requiring additional configuration to access the system again. If a GUI is an operational requirement, a tailored profile that removes this rule should used before continuing installation.