RHEL 10 must enforce password complexity by requiring that at least one lowercase character be used.

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 must be tested before the password is compromised.

Requiring a minimum number of lowercase characters makes password guessing attacks more difficult by ensuring a larger search space.

Verify RHEL 10 enforces password complexity by requiring that at least one lowercase character be used with the following command:

$ sudo grep -s lcredit /etc/security/pwquality.conf /etc/security/pwquality.conf/*.conf /etc/security/pwquality.conf:lcredit = -1

If the value of "lcredit" is a positive number or is commented out, this is a finding.

Configure RHEL 10 to enforce password complexity by requiring that at least one lowercase character be used by setting the "lcredit" option.

Add or update the following line in the "/etc/security/pwquality.conf" file or a configuration file in the "/etc/security/pwquality.conf.d/" directory to contain the "lcredit" parameter:

lcredit = -1