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

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000366

SV-64341r1_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

Check the system for duplicate UID 0 assignments by listing all accounts assigned UID 0. Procedure: # awk -F: '($3 == 0) { print $1 }' /etc/passwd If any accounts other than root are assigned UID 0, this is a finding.

Fix text

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

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