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To properly set the permissions of /etc/shadow
, run the command:
$ sudo chmod 0640 /etc/shadow
The /etc/shadow
file contains the list of local
system accounts and stores password hashes. Protection of this file is
critical for system security. Failure to give ownership of this file
to root provides the designated owner with access to sensitive information
which could weaken the system security posture.
The following script can be run on the host to remediate the issue.
#!/bin/bash
chmod u-xs,g-xws,o-xwrt /etc/shadow
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:
- CJIS-5.5.2.2
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-8.7.c
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_etc_shadow
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure permission u-xs,g-xws,o-xwrt on /etc/shadow
file:
path: /etc/shadow
mode: u-xs,g-xws,o-xwrt
when: file_exists.stat is defined and file_exists.stat.exists
tags:
- CJIS-5.5.2.2
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-8.7.c
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_etc_shadow
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed