Verify User Who Owns Backup shadow File
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Description
To properly set the group owner of /etc/shadow-, run the command:
$ sudo chgrp shadow /etc/shadow-
Rationale
The /etc/shadow- file is a backup file of /etc/shadow, and as such,
it contains the list of local system accounts and password hashes.
Protection of this file is critical for system security.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
chgrp -L 42 /etc/shadow-
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Test for existence /etc/shadow-
stat:
path: /etc/shadow-
register: file_exists
tags:
- PCI-DSS-Req-8.7
- PCI-DSSv4-2.2.6
- configure_strategy
- file_groupowner_backup_etc_shadow
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure group owner 42 on /etc/shadow-
file:
path: /etc/shadow-
group: '42'
when: file_exists.stat is defined and file_exists.stat.exists
tags:
- PCI-DSS-Req-8.7
- PCI-DSSv4-2.2.6
- configure_strategy
- file_groupowner_backup_etc_shadow
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
