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RHEL 8 must require the change of at least 8 characters when passwords are changed.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230363 RHEL-08-020170 SV-230363r858783_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 "difok" option sets the number of characters in a password that must not be present in the old password.
STIG Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2022-12-06

Details

Check Text ( C-33032r833324_chk )
Verify the value of the "difok" option with the following command:

$ sudo grep -r difok /etc/security/pwquality.conf*

/etc/security/pwquality.conf:difok = 8

If the value of "difok" is set to less than "8" or is commented out, this is a finding.
If conflicting results are returned, this is a finding.
Fix Text (F-33007r858782_fix)
Configure the operating system to require the change of at least eight of the total number of characters when passwords are changed by setting the "difok" option.

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

difok = 8

Remove any configurations that conflict with the above value.