From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide
Part of SRG-OS-000071-GPOS-00039
Associated with: CCI-000194
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.
Verify the Ubuntu operating system enforces password complexity by requiring that at least one numeric character be used. Determine if the field "dcredit" is set in the "/etc/security/pwquality.conf" file with the following command: # grep -i "dcredit" /etc/security/pwquality.conf dcredit=-1 If the "dcredit" parameter is not equal to "-1", or is commented out, this is a finding.
Configure the Ubuntu operating system to enforce password complexity by requiring that at least one numeric character be used. Add or update the following line in the "/etc/security/pwquality.conf" file to contain the "dcredit" parameter: dcredit=-1
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