The Ubuntu operating system must enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt.

From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide

Associated with: CCI-000366

SV-90173r1_rule The Ubuntu operating system must enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt.

Vulnerability discussion

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

Check content

Verify the Ubuntu operating system enforces a delay of at least 4 seconds between logon prompts following a failed logon attempt. Check that the Ubuntu operating system enforces a delay of at least 4 seconds between logon prompts with the following command: # grep pam_faildelay /etc/pam.d/common-auth* auth required pam_faildelay.so delay=4000000 If the line is not present, or is commented out, this is a finding.

Fix text

Configure the Ubuntu operating system to enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt. Edit the file "/etc/pam.d/common-auth" and set the parameter "pam_faildelay" to a value of 4000000 or greater: auth required pam_faildelay.so delay=4000000

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