STIGQter STIGQter: STIG Summary: Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 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.

DISA Rule

SV-260555r991590_rule

Vulnerability Number

V-260555

Group Title

SRG-OS-000480-GPOS-00228

Rule Version

UBTU-22-412035

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

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

Check Contents

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.

Vulnerability Number

V-260555

Documentable

False

Rule Version

UBTU-22-412035

Severity Override Guidance

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.

Check Content Reference

M

Target Key

5594