All files and directories must have a valid group owner.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75557	UBTU-16-010710	SV-90237r1_rule		Medium

Description
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.

STIG	Date
Canonical Ubuntu 16.04 Security Technical Implementation Guide	2020-05-29

Details

Check Text ( C-75261r1_chk )
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 (F-82185r1_fix)
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