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RHEL 8 must require the change of at least four character classes when passwords are changed.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230362 RHEL-08-020160 SV-230362r599732_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. The "minclass" option sets the minimum number of required classes of characters for the new password (digits, uppercase, lowercase, others).
STIG Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2020-11-25

Details

Check Text ( C-33031r567832_chk )
Verify the value of the "minclass" option in "/etc/security/pwquality.conf" with the following command:

$ sudo grep minclass /etc/security/pwquality.conf
minclass = 4

If the value of "minclass" is set to less than "4" or is commented out, this is a finding.
Fix Text (F-33006r567833_fix)
Configure the operating system to require the change of at least four character classes when passwords are changed by setting the "minclass" option.

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

minclass = 4