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RHEL 8 must enforce password complexity by requiring that at least one lower-case character be used.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230358 RHEL-08-020120 SV-230358r599732_rule Medium
Description
Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised. RHEL 8 utilizes pwquality as a mechanism to enforce password complexity. Note that in order to require lower-case characters without degrading the "minlen" value, the credit value must be expressed as a negative number in "/etc/security/pwquality.conf".
STIG Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2020-11-25

Details

Check Text ( C-33027r567820_chk )
Verify the value for "lcredit" in "/etc/security/pwquality.conf" with the following command:

$ sudo grep lcredit /etc/security/pwquality.conf

lcredit = -1

If the value of "lcredit" is a positive number or is commented out, this is a finding.
Fix Text (F-33002r567821_fix)
Configure the operating system to enforce password complexity by requiring that at least one lower-case character be used by setting the "lcredit" option.

Add the following line to /etc/security/pwquality.conf (or modify the line to have the required value):

lcredit = -1