Title

All files and directories must have a valid group owner. (Cat II impact)

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 <group> <file>

Additional Identifiers

Rule ID: SV-215003r610931_rule

Vulnerability ID: V-215003

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.