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.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-282755 | TOSS-05-000318 | SV-282755r1201616_rule | CCI-000366 | medium |
| Description | ||||
| Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide | 2026-04-01 | |||
Details
Check Text (C-282755r1201616_chk)
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.
Fix Text (F-87221r1201244_fix)
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