Vulnerability 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 need to be tested before the password is compromised.

Check

The "difok" option sets the number of characters in a password that must not be present in the old password.

Check for the value of the "difok" option in "/etc/security/pwquality.conf" with the following command:

# grep difok /etc/security/pwquality.conf
difok = 8

If the value of "difok" is set to less than "8", this is a finding.

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