Title

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

Discussion

Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier "UID" as the UID of the un-owned files.

Check Content

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

Fix Text

Either remove all files and directories from the system that do not have a valid user, or assign a valid user to all unowned files and directories on the Ubuntu operating system with the "chown" command: # sudo chown <user> <file>

Additional Identifiers

Rule ID: SV-90235r1_rule

Vulnerability ID: V-75555

Group Title:

Expert Comments

CCIs tied to check.

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