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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75493	UBTU-16-010320	SV-90173r1_rule		Medium

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

STIG	Date
Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide	2018-07-18

Details

Check Text ( C-75197r1_chk )
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.

Check Text ( C-75197r1_chk )

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 (F-82121r1_fix)
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