Title

The operating system must have no unowned files. (Cat II impact)

Discussion

A new user who is assigned a deleted user's user ID or group ID may then end up owning these files, and thus have more access on the system than was intended.

Check Content

The root role is required. Identify all files that are owned by a user or group not listed in /etc/passwd or /etc/group # find / \( -fstype nfs -o -fstype cachefs -o -fstype autofs \ -o -fstype ctfs -o -fstype mntfs -o -fstype objfs \ -o -fstype proc \) -prune \( -nouser -o -nogroup \) -ls If output is produced, this is a finding.

Fix Text

The root role is required. Correct or justify any items discovered in the Check step. Determine the existence of any files that are not attributed to current users or groups on the system, and determine the best course of action in accordance with site policy. Remove the files and directories or change their ownership.

Additional Identifiers

Rule ID: SV-216436r603267_rule

Vulnerability ID: V-216436

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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