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-91767r3_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	2020-06-30

Details

Check Text ( C-76681r3_chk )
Verify the SUSE operating system locks a user account after three consecutive failed logon attempts until the locked account is released by an administrator. Check that the system locks a user account after three consecutive failed login attempts using the following command: # grep pam_tally2.so /etc/pam.d/common-auth auth required pam_tally2.so deny=3 If the "deny" option is greater than "3", is missing, or is commented out, this is a finding. Check that the system resets the failed login attempts counter after a successful login using the following command: # grep pam_tally2.so /etc/pam.d/common-account account required pam_tally2.so deny=3 If the "deny" option is greater than "3", is missing, or is commented out, this is a finding.

Check Text ( C-76681r3_chk )

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

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

# grep pam_tally2.so /etc/pam.d/common-auth
auth required pam_tally2.so deny=3

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

Check that the system resets the failed login attempts counter after a successful login using the following command:

# grep pam_tally2.so /etc/pam.d/common-account
account required pam_tally2.so deny=3

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

Fix Text (F-83769r3_fix)
Configure the SUSE operating system to lock a user account after three consecutive failed logon attempts until the locked account is released by an administrator. Add or modify the following line in the auth section of the "/etc/pam.d/common-auth" file to match the following: auth required pam_tally2.so deny=3 Add or modify the following line in the account section of the "/etc/pam.d/common-account" file to match the following: account required pam_tally2.so deny=3

Fix Text (F-83769r3_fix)

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

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

auth required pam_tally2.so deny=3

Add or modify the following line in the account section of the "/etc/pam.d/common-account" file to match the following:

account required pam_tally2.so deny=3