All files and directories must have a valid group owner.

From Canonical Ubuntu 16.04 Security Technical Implementation Guide

Associated with: CCI-002165

SV-90237r1_rule All files and directories must have a valid group owner.

Vulnerability discussion

Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as the GID of the files without a valid group owner.

Check content

Verify all files and directories on the Ubuntu operating system have a valid group. Check the owner of all files and directories with the following command: # sudo find / -nogroup If any files on the system do not have an assigned group, this is a finding.

Fix text

Either remove all files and directories from the Ubuntu operating system that do not have a valid group, or assign a valid group to all files and directories on the system with the "chgrp" command: # sudo chgrp

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