Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

The Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide (V1 R2) has 391 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

V1 · R2

CurrentPublished Wed Sep 30 2026

TOSS 5 must automatically lock an account when three unsuccessful login attempts occur.

Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

Assessment Title

Rule Text

TOSS 5 must automatically lock an account when three unsuccessful login attempts occur.

Description

Discussion Text

By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.

Satisfies: SRG-OS-000021-GPOS-00005, SRG-OS-000329-GPOS-00128

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

Objective

V-282360

Rule

SV-282360r1200060_rule

Severity

medium

Rule Version

TOSS-05-000304

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Verify TOSS 5 is configured to lock an account after three unsuccessful login attempts using the command:

$ grep 'deny =' /etc/security/faillock.conf

deny = 3

If the "deny" option is not set to "3" or less (but not "0"), is missing or commented out, this is a finding.

Implementation Procedure

Fix Text

Configure TOSS 5 to lock an account when three unsuccessful login attempts occur.

Add or modify the "/etc/security/faillock.conf" file to match the following line:

deny = 3

STIG check 9 of 391 in the Tri-Lab Operating System Stack (TOSS) 5 STIG checklist

← Previous · V-282359TOSS 5 must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.Next · V-282361 →TOSS 5 must automatically lock an account when three unsuccessful login attempts occur during a 15-minute time period.