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

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Part of GEN000880

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

Associated with: CCI-000366

SV-37347r1_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.

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Fix text

Remove or change the UID of accounts other than root that have UID 0.

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