Verify Permissions on /etc/at.allow file
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Description
If /etc/at.allow
exists, it must have permissions 0640
or more restrictive.
To properly set the permissions of /etc/at.allow
, run the command:
$ sudo chmod 0640 /etc/at.allow
Rationale
If the permissions of the at.allow file are not set to 0640 or more restrictive,
the possibility exists for an unauthorized user to view or edit sensitive information.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
# Remediation is applicable only in certain platforms
if dpkg-query --show --showformat='${db:Status-Status}
' 'kernel' 2>/dev/null | grep -q installed; then
chmod u-xs,g-xws,o-xwrt /etc/at.allow
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Gather the package facts
package_facts:
manager: auto
tags:
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_at_allow
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Test for existence /etc/at.allow
stat:
path: /etc/at.allow
register: file_exists
when: '"kernel" in ansible_facts.packages'
tags:
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_at_allow
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure permission u-xs,g-xws,o-xwrt on /etc/at.allow
file:
path: /etc/at.allow
mode: u-xs,g-xws,o-xwrt
when:
- '"kernel" in ansible_facts.packages'
- file_exists.stat is defined and file_exists.stat.exists
tags:
- PCI-DSSv4-2.2
- PCI-DSSv4-2.2.6
- configure_strategy
- file_permissions_at_allow
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed