Verify User Who Owns /etc/at.deny file

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Description

If /etc/at.deny exists, it must be owned by root. To properly set the owner of /etc/at.deny, run the command:

$ sudo chown root /etc/at.deny

Rationale

If the owner of the at.deny file is not set to root, the possibility exists for an unauthorized user to view or edit sensitive information.

Remediation

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='${db:Status-Status}' 'linux-base' 2>/dev/null | grep -q '^installed$'; then

newown=""
if id "0" >/dev/null 2>&1; then
  newown="0"
fi

if [[ -z "$newown" ]]; then
  >&2 echo "0 is not a defined user on the system"
else
if ! stat -c "%u %U" "/etc/at.deny" | grep -E -w -q "0"; then
    chown --no-dereference "$newown" /etc/at.deny
fi

fi

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:
  - configure_strategy
  - file_owner_at_deny
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set the file_owner_at_deny_newown variable if represented by uid
  ansible.builtin.set_fact:
    file_owner_at_deny_newown: '0'
  when: '"linux-base" in ansible_facts.packages'
  tags:
  - configure_strategy
  - file_owner_at_deny
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Test for existence /etc/at.deny
  ansible.builtin.stat:
    path: /etc/at.deny
  register: file_exists
  when: '"linux-base" in ansible_facts.packages'
  tags:
  - configure_strategy
  - file_owner_at_deny
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure owner on /etc/at.deny
  ansible.builtin.file:
    path: /etc/at.deny
    follow: false
    owner: '{{ file_owner_at_deny_newown }}'
  when:
  - '"linux-base" in ansible_facts.packages'
  - file_exists.stat is defined and file_exists.stat.exists
  tags:
  - configure_strategy
  - file_owner_at_deny
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed