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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.


Finding ID Version Rule ID IA Controls Severity
V-219178 UBTU-18-010106 SV-219178r610963_rule Low
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.
Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide 2022-12-06


Check Text ( C-20903r304862_chk )
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


If the "PASS_MIN_DAYS" parameter value is less than 1, or commented out, this is a finding.
Fix Text (F-20902r304863_fix)
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: