Verify permissions on System Login Banner for Remote Connections

문서 > Datadog 보안 > OOTB Rules > Verify permissions on System Login Banner for Remote Connections

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Description

To properly set the permissions of /etc/issue.net, run the command:

$ sudo chmod 0644 /etc/issue.net

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 permissions will ensure that only root user can modify the banner.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

chmod u-xs,g-xws,o-xwt /etc/issue.net

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Test for existence /etc/issue.net
  stat:
    path: /etc/issue.net
  register: file_exists
  tags:
  - PCI-DSSv4-1.2.8
  - configure_strategy
  - file_permissions_etc_issue_net
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure permission u-xs,g-xws,o-xwt on /etc/issue.net
  file:
    path: /etc/issue.net
    mode: u-xs,g-xws,o-xwt
  when: file_exists.stat is defined and file_exists.stat.exists
  tags:
  - PCI-DSSv4-1.2.8
  - configure_strategy
  - file_permissions_etc_issue_net
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed