The SUSE operating system must lock an account after three consecutive invalid logon attempts.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-77071	SLES-12-010130	SV-91767r2_rule		Medium

Description
By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.

STIG	Date
SLES 12 Security Technical Implementation Guide	2019-03-12

Details

Check Text ( C-76681r2_chk )
Verify the SUSE operating system locks a user account until the locked account is released by an administrator after three consecutive failed logon attempts. Check that the systems locks a user account after three consecutive failed login attempts with the following command: # grep pam_tally2.so /etc/pam.d/login auth required pam_tally2.so deny=3 If the "deny" option is greater than "3" or is missing, this is a finding.

Check Text ( C-76681r2_chk )

Verify the SUSE operating system locks a user account until the locked account is released by an administrator after three consecutive failed logon attempts.

Check that the systems locks a user account after three consecutive failed login attempts with the following command:

# grep pam_tally2.so /etc/pam.d/login

auth required pam_tally2.so deny=3

If the "deny" option is greater than "3" or is missing, this is a finding.

Fix Text (F-83769r2_fix)
Configure the SUSE operating system to lock a user account until the locked account is released by an administrator after three consecutive failed logon attempts. Add or modify the following line in the auth section of the "/etc/pam.d/login" file (or other services being used) to match the following: auth required pam_tally2.so deny=3