Verify Permissions on cron.d
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Description
To properly set the permissions of /etc/cron.d
, run the command:
$ sudo chmod 0700 /etc/cron.d
Rationale
Service configuration files enable or disable features of their respective services that if configured incorrectly
can lead to insecure and vulnerable configurations. Therefore, service configuration files should have the
correct access rights to prevent unauthorized changes.
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}
' 'kernel' 2>/dev/null | grep -q installed; then
find -H /etc/cron.d/ -maxdepth 1 -perm /u+s,g+xwrs,o+xwrt -type d -exec chmod u-s,g-xwrs,o-xwrt {} \;
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-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_cron_d
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Find /etc/cron.d/ file(s)
command: 'find -H /etc/cron.d/ -maxdepth 1 -perm /u+s,g+xwrs,o+xwrt -type d '
register: files_found
changed_when: false
failed_when: false
check_mode: false
when: '"kernel" in ansible_facts.packages'
tags:
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_cron_d
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Set permissions for /etc/cron.d/ file(s)
file:
path: '{{ item }}'
mode: u-s,g-xwrs,o-xwrt
state: directory
with_items:
- '{{ files_found.stdout_lines }}'
when: '"kernel" in ansible_facts.packages'
tags:
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_cron_d
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed