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V-219178

CAT III (Low)

The Ubuntu operating system must enforce 24 hours/1 day as the minimum password lifetime. Passwords for new users must have a 24 hours/1 day minimum password lifetime restriction.

Rule ID

SV-219178r982188_rule

STIG

Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide

Version

V2R15

CCIs

CCI-000198

Discussion

Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, then the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.

Check Content

Verify that the Ubuntu operating system enforces a 24 hours/1 day minimum password lifetime for new user accounts by running the following command:

# grep -i pass_min_days /etc/login.defs

PASS_MIN_DAYS 1

If the "PASS_MIN_DAYS" parameter value is less than 1, or commented out, this is a finding.

Fix Text

Configure the Ubuntu operating system to enforce a 24 hours/1 day minimum password lifetime.

Add, or modify the following line in the "/etc/login.defs" file:

PASS_MIN_DAYS 1