V-281185

Discussion

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 different characters during password changes ensures that newly changed passwords should not resemble previously compromised ones. Note that passwords that are changed on compromised systems will still be compromised.

Check Content

Verify RHEL 10 requires the change of at least eight characters when passwords are changed by checking the value of the "difok" option in "/etc/security/pwquality.conf" with the following command:

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