STIGQter STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must define default permissions for all authenticated users in such a way that the user can only read and modify their own files.

DISA Rule

SV-282755r1201616_rule

Vulnerability Number

V-282755

Group Title

SRG-OS-000480-GPOS-00228

Rule Version

TOSS-05-000318

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure TOSS 5 to define default permissions for all authenticated users in such a way that the user can only read and modify their own files.

Add or edit the lines for the "UMASK" parameter in the "/etc/login.defs" file to "077":

UMASK 077

Check Contents

Note: If the value of the "UMASK" parameter is set to "000" in "/etc/login.defs" file, the severity is raised to a CAT I.

Verify TOSS 5 defines default permissions for all authenticated users in such a way that the user can only read and modify their own files using the following command:

# grep -i umask /etc/login.defs

UMASK 077

If the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.

Vulnerability Number

V-282755

Documentable

False

Rule Version

TOSS-05-000318

Severity Override Guidance

Note: If the value of the "UMASK" parameter is set to "000" in "/etc/login.defs" file, the severity is raised to a CAT I.

Verify TOSS 5 defines default permissions for all authenticated users in such a way that the user can only read and modify their own files using the following command:

# grep -i umask /etc/login.defs

UMASK 077

If the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.

Check Content Reference

M

Target Key

5738