The Ubuntu operating system must enforce password complexity by requiring that at least one lower-case character be used.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75451	UBTU-16-010110	SV-90131r2_rule		Medium

Description
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.

Description

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.

STIG	Date
Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide	2018-07-18

Details

Check Text ( C-75155r2_chk )
Verify the Ubuntu operating system enforces password complexity by requiring that at least one lower-case character be used. Determine if the field "lcredit" is set in the "/etc/security/pwquality.conf" file with the following command: # grep -i "lcredit" /etc/security/pwquality.conf lcredit=-1 If the "lcredit" parameter is not equal to "-1", or is commented out, this is a finding.

Fix Text (F-82079r1_fix)
Configure the Ubuntu operating system to enforce password complexity by requiring that at least one lower-case character be used. Add or update the following line in the "/etc/security/pwquality.conf" file to contain the "lcredit" parameter: lcredit=-1