The delay between login prompts following a failed login attempt must be at least 4 seconds.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-768	GEN000480	SV-44838r1_rule		Medium

Description
Enforcing a delay between successive failed login attempts increases protection against automated password guessing attacks.

STIG	Date
SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide	2018-09-19

Details

Check Text ( C-42309r1_chk )
Check the value of the FAIL_DELAY variable and the ability to use it Procedure:. # grep FAIL_DELAY /etc/login.defs If the value does not exist, or is less than 4, this is a finding. Check for the use of pam_faildelay. # grep pam_faildelay /etc/pam.d/common-auth* If the pam_faildelay.so module is not listed, this is a finding.

Fix Text (F-38275r1_fix)
Add the pam_faildelay module and set the FAIL_DELAY variable. Procedure: Edit /etc/login.defs and set the value of the FAIL_DELAY variable to 4 or more. Edit /etc/pam.d/common-auth and add a pam_faildelay entry if one does not exist, such as: auth optional pam_faildelay.so