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UBTU-24-300028 Ubuntu 24.04 LTS must not allow accounts configured in Pluggable Authentication Modules (PAM) with blank or null passwords.

DISA STIG library V1R7
All changes in this version
first version loaded CAT I

Maps to CM-6 via CCI-000366

Title

Ubuntu 24.04 LTS must not allow accounts configured in Pluggable Authentication Modules (PAM) with blank or null passwords.

Control

To verify null passwords cannot be used, run the following command: $ grep nullok /etc/pam.d/common-password /etc/pam.d/common-auth If this produces any output, this is a finding.

Discussion

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

Related controls

CCI-000366

Fix

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