The system must not have accounts configured with blank or null passwords.

From Red Hat Enterprise Linux 6 Security Technical Implementation Guide

Associated with: CCI-000366

SV-50298r2_rule The system must not have accounts configured with blank or null passwords.

Vulnerability discussion

If an account has an empty password, anyone could log in and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.

Check content

To verify that null passwords cannot be used, run the following command: # grep nullok /etc/pam.d/system-auth If this produces any output, it may be possible to log into accounts with empty passwords. If NULL passwords can be used, this is a finding.

Fix text

If an account is configured for password authentication but does not have an assigned password, it may be possible to log onto the account without authentication. Remove any instances of the "nullok" option in "/etc/pam.d/system-auth" to prevent logons with empty passwords.

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