All Group Identifiers (GIDs) referenced in the /etc/passwd file must be defined in the /etc/group file.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-27071r1_rule All Group Identifiers (GIDs) referenced in the /etc/passwd file must be defined in the /etc/group file.

Vulnerability discussion

If a user is assigned the GID of a group that does not exist on the system, and a group with that 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: # usrck -n ALL If GIDs referenced in /etc/passwd are not defined in /etc/group are returned, this is a finding.

Fix text

Add a group to the system for each GID referenced without a corresponding group. # smitty mkgroup

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