Ubuntu 22.04 LTS must enforce a delay of at least four seconds between logon prompts following a failed logon attempt.

Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account.

Verify Ubuntu 22.04 LTS enforces a delay of at least four seconds between logon prompts following a failed logon attempt by using the following command:

     $ grep pam_faildelay /etc/pam.d/common-auth 
     auth     required     pam_faildelay.so     delay=4000000  

If "delay" is not set to "4000000" or greater, the line is commented out, or is missing, this is a finding.

Configure Ubuntu 22.04 LTS to enforce a delay of at least four seconds between logon prompts following a failed logon attempt.

Add or modify the following line in the "/etc/pam.d/common-auth" file:

auth required pam_faildelay.so delay=4000000