The Ubuntu operating system must disable account identifiers (individuals, groups, roles, and devices) after 35 days of inactivity.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-219326	UBTU-18-010445	SV-219326r610963_rule		Medium

Description
Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained. Ubuntu operating systems need to track periods of inactivity and disable application identifiers after 35 days of inactivity.

Description

Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained. Ubuntu operating systems need to track periods of inactivity and disable application identifiers after 35 days of inactivity.

STIG	Date
Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide	2021-03-10

Details

Check Text ( C-21051r305306_chk )
Verify the account identifiers (individuals, groups, roles, and devices) are disabled after 35 days of inactivity with the following command: Check the account inactivity value by performing the following command: # sudo grep INACTIVE /etc/default/useradd INACTIVE=35 If "INACTIVE" is not set to a value 0<[VALUE]<=35, or is commented out, this is a finding.

Fix Text (F-21050r305307_fix)
Configure the Ubuntu operating system to disable account identifiers after 35 days of inactivity after the password expiration. Run the following command to change the configuration for adduser: # sudo useradd -D -f 35 Note: DoD recommendation is 35 days, but a lower value is acceptable. The value "0" will disable the account immediately after the password expires.