Verify Permissions on /var/log/wtmp(.*) Files

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Description

To properly set the permissions of /var/log/(b|w)tmp(.*|-*), run the command:

$ sudo chmod 0664 /var/log/(b|w)tmp(.*|-*)

Rationale

The /var/log/(b|w)tmp(.*|-*) files contains logs of reports the most recent login of all users and should only be accessed by authorized personnel.

Remediation

Shell script

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

#!/bin/bash

find -L /var/log/ -maxdepth 1 -perm /u+xs,g+xs,o+xwt  -type f -regextype posix-extended -regex '.*(b|w)tmp((\.|-)[^\/]+)?$' -exec chmod u-xs,g-xs,o-xwt {} \;

Ansible playbook

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

- name: Find /var/log/ file(s)
  command: find -L /var/log/ -maxdepth 1 -perm /u+xs,g+xs,o+xwt  -type f -regextype
    posix-extended -regex ".*(b|w)tmp((\.|-)[^\/]+)?$"
  register: files_found
  changed_when: false
  failed_when: false
  check_mode: false
  tags:
  - configure_strategy
  - file_permissions_var_log_wbtmp
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set permissions for /var/log/ file(s)
  file:
    path: '{{ item }}'
    mode: u-xs,g-xs,o-xwt
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  tags:
  - configure_strategy
  - file_permissions_var_log_wbtmp
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed