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

From Apple OS X 10.10 (Yosemite) Workstation Security Technical Implementation Guide

Associated with: CCI-000366

SV-74151r1_rule The root account must be the only account having a UID of 0.

Vulnerability discussion

The built-in root account is disabled by default and administrator users are required to use sudo to run a process with the UID '0'. If another account with UID '0' exists, this is a sign of a network intrusion or a malicious user that is attempting to circumvent security controls.

Check content

To list all of the accounts with a UID of '0', run this command: sudo dscl . -list /Users UniqueID | grep -w 0 | wc -l If the result is not '1', this is a finding.

Fix text

Investigate as to why any additional accounts were set up with a UID of '0'. Remove any invalid accounts.

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