AlmaLinux OS 9 /var/log/messages file must be group-owned by root.

Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the AlmaLinux OS 9 system or platform.

Additionally, personally identifiable information (PII) and operational information must not be revealed through error messages to unauthorized personnel or their designated representatives.

The structure and content of error messages must be carefully considered by the organization and development team. The extent to which the information system is able to identify and handle error conditions is guided by organizational policy and operational requirements.

Verify the "/var/log/messages" file is group-owned by root with the following command:

$ stat -c "%U:%G %#a %n" /var/log

root:root 0755 /var/log

If "/var/log/messages" does not have a group-owner of "root", this is a finding.

Change the group-owner of the "/var/log/messages" file to "root" by running the following command:

$ chgrp root /var/log/messages