Title

All GIDs referenced in the /etc/passwd file must be defined in the /etc/group file. (Cat III impact)

Discussion

If a user is assigned the GID of a group not existing on the system, and a group with the same GID is subsequently created, the user may have unintended rights to the group.

Check Content

Perform the following to ensure there are no GIDs referenced in /etc/passwd not defined in /etc/group. # logins -o | awk -F: '$3 == ""' If any lines are returned, there are GIDs referenced in /etc/passwd that are not defined in /etc/group, this is a finding.

Fix Text

Add a group to the system for each GID referenced that does not have a corresponding group. #/usr/sbin/groupadd < group >

Additional Identifiers

Rule ID: SV-227573r603266_rule

Vulnerability ID: V-227573

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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