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V-270714

CAT I (High)

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

Rule ID

SV-270714r1134808_rule

STIG

Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide

Version

V1R5

CCIs

CCI-000366

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.

Check Content

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.

Fix Text

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" to prevent logons with empty passwords.