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


Finding ID Version Rule ID IA Controls Severity
V-251503 UBTU-20-010462 SV-251503r808506_rule High
If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide 2022-09-07


Check Text ( C-54938r808504_chk )
Check the "/etc/shadow" file for blank passwords with the following command:

$ sudo awk -F: '!$2 {print $1}' /etc/shadow

If the command returns any results, this is a finding.
Fix Text (F-54892r808505_fix)
Configure all accounts on the system to have a password or lock the account with the following commands:

Perform a password reset:
$ sudo passwd [username]
Lock an account:
$ sudo passwd -l [username]