Verify ownership of System Login Banner
Description
To properly set the owner of /etc/issue
, run the command:
$ sudo chown root /etc/issue
Rationale
Display of a standardized and approved use notification before granting
access to the operating system ensures privacy and security notification
verbiage used is consistent with applicable federal laws, Executive Orders,
directives, policies, regulations, standards, and guidance.
Proper ownership will ensure that only root user can modify the banner.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
if id "0" >/dev/null 2>&1; then
newown="0"
fi
if [[ -z ${newown} ]]; then
echo "0 is not a defined user on the system"
exit 1
fi
chown $newown /etc/issue
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Set the file_owner_etc_issue_newown variable if represented by uid
set_fact:
file_owner_etc_issue_newown: '0'
tags:
- configure_strategy
- file_owner_etc_issue
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Test for existence /etc/issue
stat:
path: /etc/issue
register: file_exists
tags:
- configure_strategy
- file_owner_etc_issue
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure owner on /etc/issue
file:
path: /etc/issue
owner: '{{ file_owner_etc_issue_newown }}'
when: file_exists.stat is defined and file_exists.stat.exists
tags:
- configure_strategy
- file_owner_etc_issue
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed