RHEL 9 groups must have unique Group ID (GID).

Documentable No

Rule ID SV-258061r958482_rule

CCI References

CCI-000764

Discussion

To ensure accountability and prevent unauthenticated access, groups must be identified uniquely to prevent potential misuse and compromise of the system.

Check Procedure

Verify that RHEL 9 contains no duplicate GIDs for interactive users with the following command:
 
 $  cut -d : -f 3 /etc/group | uniq -d
 
If the system has duplicate GIDs, this is a finding.

Fix Action

Edit the file "/etc/group" and provide each group that has a duplicate GID with a unique GID.