Information
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. Requiring a minimum number of lowercase characters makes password guessing attacks more difficult by ensuring a larger search space.
Solution
Configure OL 9 to enforce password complexity by requiring at least one lowercase character is 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