Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide

The Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide (V2 R10) has 191 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V2 · R10

CurrentPublished Wed Sep 30 2026

Ubuntu 22.04 LTS default filesystem permissions must be defined in such a way that all authenticated users can read and modify only their own files.

Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide

Assessment Title

Rule Text

Ubuntu 22.04 LTS default filesystem permissions must be defined in such a way that all authenticated users can read and modify only their own files.

Description

Discussion Text

Setting the most restrictive default permissions ensures newly created accounts do not have unnecessary access.

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-260555

Rule

SV-260555r991590_rule

Severity

medium

Rule Version

UBTU-22-412035

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Verify Ubuntu 22.04 LTS defines default permissions for all authenticated users in such a way that the user can read and modify only their own files by using the following command: 
  
     $ grep -i '^\s*umask' /etc/login.defs  
     UMASK 077  
  
If the "UMASK" variable is set to "000", this is a finding with the severity raised to a CAT I.

If "UMASK" is not set to "077", is commented out, or is missing, this is a finding.

Implementation Procedure

Fix Text

Configure Ubuntu 22.04 LTS to define the default permissions for all authenticated users in such a way that the user can read and modify only their own files.  
 
Add or modify the following line in the "/etc/login.defs" file:  
 
UMASK 077

STIG check 85 of 191 in the Canonical Ubuntu 22.04 LTS STIG checklist

← Previous · V-260554Ubuntu 22.04 LTS must automatically exit interactive command shell user sessions after 15 minutes of inactivity.Next · V-260556 →Ubuntu 22.04 LTS must have the "apparmor" package installed.