The root account must be the only account having a UID of “0”.

From MAC OSX 10.6 Workstation Security Technical Implementation Guide

Associated with IA controls: IAIA-2, ECLP-1, IAIA-1

Associated with: CCI-000366

SV-37848r1_rule The root account must be the only account having a UID of “0”.

Vulnerability discussion

If an account has a UID of “0”, it has root authority. Multiple accounts with a UID of “0” afford more opportunity for potential intruders to guess a password for a privileged account.

Check content

Enter the following command to view users with a UID of "0": grep :0 /etc/passwd If any user other than root has a UID of "0", this is a finding.

Fix text

Edit the /etc/passwd file and change the UID of the duplicate to an unused UID.

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