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RHEL 8 must automatically lock an account when three unsuccessful logon attempts occur during a 15-minute time period.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230335 RHEL-08-020013 SV-230335r743969_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. In RHEL 8.2 the "/etc/security/faillock.conf" file was incorporated to centralize the configuration of the pam_faillock.so module. Also introduced is a "local_users_only" option that will only track failed user authentication attempts for local users in /etc/passwd and ignore centralized (AD, IdM, LDAP, etc.) users to allow the centralized platform to solely manage user lockout. From "faillock.conf" man pages: Note that the default directory that "pam_faillock" uses is usually cleared on system boot so the access will be reenabled after system reboot. If that is undesirable a different tally directory must be set with the "dir" option. Satisfies: SRG-OS-000021-GPOS-00005, SRG-OS-000329-GPOS-00128
STIG Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2022-06-15

Details

Check Text ( C-33004r743967_chk )
Note: This check applies to RHEL versions 8.2 or newer, if the system is RHEL version 8.0 or 8.1, this check is not applicable.

Verify the "/etc/security/faillock.conf" file is configured to lock an account after three unsuccessful logon attempts within 15 minutes:

$ sudo grep 'fail_interval =' /etc/security/faillock.conf

fail_interval = 900

If the "fail_interval" option is not set to "900" or more, is missing or commented out, this is a finding.
Fix Text (F-32979r743968_fix)
Configure the operating system to lock an account when three unsuccessful logon attempts occur in 15 minutes.

Add/Modify the "/etc/security/faillock.conf" file to match the following line:

fail_interval = 900