STIGQter STIGQter: STIG Summary: Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

Ubuntu 24.04 LTS default filesystem permissions must be defined in such a way that all authenticated users can read and modify only their own files.

DISA Rule

SV-270716r1066637_rule

Vulnerability Number

V-270716

Group Title

SRG-OS-000480-GPOS-00228

Rule Version

UBTU-24-300030

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the system to define the default permissions for all authenticated users in such a way that the user can read and modify only their own files.

Edit the "UMASK" parameter in the "/etc/login.defs" file to match the example below:

UMASK 077

Check Contents

Verify Ubuntu 24.04 LTS defines default permissions for all authenticated users in such a way that the user can read and modify only their own files with 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 the value of "UMASK" is not set to "077", is commented out, or is missing, this is a finding.

Vulnerability Number

V-270716

Documentable

False

Rule Version

UBTU-24-300030

Severity Override Guidance

Verify Ubuntu 24.04 LTS defines default permissions for all authenticated users in such a way that the user can read and modify only their own files with 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 the value of "UMASK" is not set to "077", is commented out, or is missing, this is a finding.

Check Content Reference

M

Target Key

5673