Verify Permissions on Backup passwd File

Classification:

compliance

Framework:

Control:

Description

To properly set the permissions of /etc/passwd-, run the command:

$ sudo chmod 0644 /etc/passwd-

Rationale

The /etc/passwd- file is a backup file of /etc/passwd, and as such, it contains information about the users that are configured on the system. Protection of this file is critical for system security.

Remediation

Shell script

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

chmod u-xs,g-xws,o-xwt /etc/passwd-

Ansible playbook

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

- name: Test for existence /etc/passwd-
 stat:
 path: /etc/passwd-
 register: file\_exists
 tags:
 - NIST-800-53-AC-6 (1)
 - PCI-DSS-Req-8.7.c
 - PCI-DSSv4-7.2.6
 - configure\_strategy
 - file\_permissions\_backup\_etc\_passwd
 - low\_complexity
 - low\_disruption
 - medium\_severity
 - no\_reboot\_needed

- name: Ensure permission u-xs,g-xws,o-xwt on /etc/passwd-
 file:
 path: /etc/passwd-
 mode: u-xs,g-xws,o-xwt
 when: file\_exists.stat is defined and file\_exists.stat.exists
 tags:
 - NIST-800-53-AC-6 (1)
 - PCI-DSS-Req-8.7.c
 - PCI-DSSv4-7.2.6
 - configure\_strategy
 - file\_permissions\_backup\_etc\_passwd
 - low\_complexity
 - low\_disruption
 - medium\_severity
 - no\_reboot\_needed