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hardening-windows-endpoint-with-cis-benchmark

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更新日2026年7月3日 14:43

Hardens Windows endpoints using CIS (Center for Internet Security) Benchmark recommendations to reduce attack surface, enforce security baselines, and meet compliance requirements. Use when deploying new Windows workstations or servers, remediating audit findings, or establishing organization-wide security baselines. Activates for requests involving Windows hardening, CIS benchmarks, GPO security baselines, or endpoint configuration compliance.

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ネットワーク・コンピュータシステム管理者コンピュータ・数学職·SOC 15-1244

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name	hardening-windows-endpoint-with-cis-benchmark
description	Hardens Windows endpoints using CIS (Center for Internet Security) Benchmark recommendations to reduce attack surface, enforce security baselines, and meet compliance requirements. Use when deploying new Windows workstations or servers, remediating audit findings, or establishing organization-wide security baselines. Activates for requests involving Windows hardening, CIS benchmarks, GPO security baselines, or endpoint configuration compliance.
domain	cybersecurity
subdomain	endpoint-security
tags	["endpoint","hardening","windows-security","CIS-benchmark","GPO","baseline-configuration"]
version	1.0.0
author	mahipal
license	Apache-2.0
nist_csf	["PR.PS-01","PR.PS-02","DE.CM-01","PR.IR-01"]

Hardening Windows Endpoint with CIS Benchmark

When to Use

Use this skill when:

Deploying new Windows 10/11 or Server 2019/2022 endpoints that require security hardening
Establishing organization-wide security baselines using CIS Level 1 or Level 2 profiles
Remediating findings from compliance audits (PCI DSS, HIPAA, SOC 2) that reference CIS benchmarks
Validating existing endpoint configurations against current CIS benchmark versions

Do not use this skill for Linux endpoints (use hardening-linux-endpoint-with-cis-benchmark) or for cloud-native workloads that require CIS cloud benchmarks.

Prerequisites

Windows 10/11 Enterprise or Windows Server 2019/2022 target endpoints
Active Directory Group Policy Management Console (GPMC) for enterprise deployment
CIS-CAT Pro Assessor or CIS-CAT Lite for automated benchmark assessment
Administrative access to target endpoints or domain controller
Current CIS Benchmark PDF for the target Windows version (download from cisecurity.org)

Workflow

Step 1: Select CIS Benchmark Profile Level

CIS provides two profile levels for Windows endpoints:

Level 1 (L1) - Corporate/Enterprise Environment:

Practical hardening settings that can be applied to most organizations
Minimal impact on functionality and user experience
Covers: password policy, audit policy, user rights, security options, Windows Firewall

Level 2 (L2) - High Security/Sensitive Data:

Includes all L1 settings plus additional restrictions
May impact usability (disabling autorun, restricting remote desktop, enhanced audit logging)
Appropriate for systems handling PII, PHI, PCI data, or classified information

Select profile based on data classification and risk tolerance of the endpoint.

Step 2: Import CIS GPO Baselines

CIS provides pre-built GPO templates (Build Kits) for each benchmark version:

# Download CIS Build Kit from CIS WorkBench (requires CIS SecureSuite membership)
# Extract the GPO backup to a staging directory

# Import the CIS GPO into Active Directory
Import-GPO -BackupGpoName "CIS Microsoft Windows 11 Enterprise v3.0.0 L1" `
  -TargetName "CIS-Win11-L1-Baseline" `
  -Path "C:\CIS-GPO-Backups\Win11-Enterprise" `
  -CreateIfNeeded

# Link GPO to target OU
New-GPLink -Name "CIS-Win11-L1-Baseline" `
  -Target "OU=Workstations,DC=corp,DC=example,DC=com" `
  -LinkEnabled Yes

Step 3: Apply Key CIS Benchmark Categories

Account Policies (Section 1):

Password Policy:
  - Minimum password length: 14 characters (1.1.4)
  - Maximum password age: 365 days (1.1.3)
  - Password complexity: Enabled (1.1.5)
  - Store passwords using reversible encryption: Disabled (1.1.6)

Account Lockout Policy:
  - Account lockout threshold: 5 invalid logon attempts (1.2.1)
  - Account lockout duration: 15 minutes (1.2.2)
  - Reset account lockout counter after: 15 minutes (1.2.3)

Local Policies - Audit Policy (Section 17):

Audit Policy Configuration:
  - Audit Credential Validation: Success and Failure (17.1.1)
  - Audit Security Group Management: Success (17.2.5)
  - Audit Logon: Success and Failure (17.5.1)
  - Audit Process Creation: Success (17.6.1)
  - Audit Removable Storage: Success and Failure (17.6.4)

Security Options (Section 2.3):

  - Interactive logon: Do not display last user name: Enabled (2.3.7.1)
  - Interactive logon: Machine inactivity limit: 900 seconds (2.3.7.3)
  - Network access: Do not allow anonymous enumeration of SAM accounts: Enabled (2.3.10.2)
  - Network security: LAN Manager authentication level: Send NTLMv2 response only (2.3.11.7)
  - UAC: Run all administrators in Admin Approval Mode: Enabled (2.3.17.6)

Windows Firewall (Section 9):

  - Domain Profile: Firewall state: On (9.1.1)
  - Domain Profile: Inbound connections: Block (9.1.2)
  - Private Profile: Firewall state: On (9.2.1)
  - Public Profile: Firewall state: On (9.3.1)
  - Public Profile: Inbound connections: Block (9.3.2)

Step 4: Validate with CIS-CAT Assessment

# Run CIS-CAT Pro Assessor against target endpoint
# CIS-CAT produces an HTML/XML report with pass/fail per recommendation

.\Assessor-CLI.bat `
  -b "benchmarks\CIS_Microsoft_Windows_11_Enterprise_Benchmark_v3.0.0-xccdf.xml" `
  -p "Level 1 (L1) - Corporate/Enterprise Environment" `
  -rd "C:\CIS-Reports" `
  -nts

# Review report for failed controls
# Score target: 95%+ for L1, 90%+ for L2 (due to operational exceptions)

Step 5: Document Exceptions and Compensating Controls

For each CIS recommendation that cannot be applied:

Document the specific recommendation ID and title
State the business justification for the exception
Define the compensating control that addresses the residual risk
Set a review date (quarterly) to reassess the exception
Obtain sign-off from the information security officer

Example exception:

Recommendation: 2.3.7.3 - Interactive logon: Machine inactivity limit: 900 seconds
Exception: Kiosk systems in manufacturing floor require 1800 seconds
Compensating Control: Physical badge-access to manufacturing area, CCTV monitoring
Review Date: 2026-06-01
Approved By: CISO

Step 6: Continuous Compliance Monitoring

Configure recurring CIS-CAT scans via scheduled tasks or SCCM:

# Create scheduled task for weekly CIS-CAT assessment
$action = New-ScheduledTaskAction -Execute "C:\CIS-CAT\Assessor-CLI.bat" `
  -Argument "-b benchmarks\CIS_Win11_v3.0.0-xccdf.xml -p Level1 -rd C:\CIS-Reports -nts"
$trigger = New-ScheduledTaskTrigger -Weekly -DaysOfWeek Sunday -At 2am
$principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -RunLevel Highest
Register-ScheduledTask -TaskName "CIS-Benchmark-Scan" -Action $action `
  -Trigger $trigger -Principal $principal

Feed results into SIEM for drift detection and dashboard reporting.

Key Concepts

Term	Definition
CIS Benchmark	Consensus-based security configuration guide developed by CIS with input from government, industry, and academia
Level 1 Profile	Practical security baseline suitable for most organizations with minimal operational impact
Level 2 Profile	Extended security baseline for high-security environments that may reduce functionality
CIS-CAT	CIS Configuration Assessment Tool that automates benchmark compliance checking
Build Kit	Pre-configured GPO templates provided by CIS that implement benchmark recommendations
Scoring	CIS recommendations are either Scored (compliance-measurable) or Not Scored (best-practice guidance)

Tools & Systems

CIS-CAT Pro Assessor: Automated benchmark compliance scanner (requires CIS SecureSuite license)
Microsoft Security Compliance Toolkit (SCT): Microsoft's own GPO baselines (complementary to CIS)
Group Policy Management Console (GPMC): Enterprise GPO deployment and management
LGPO.exe: Microsoft tool for applying GPOs to standalone (non-domain) systems
Nessus/Tenable: Vulnerability scanner with CIS benchmark audit files

Common Pitfalls

Applying L2 to all endpoints: Level 2 restrictions (disabling Autoplay, restricting Remote Desktop) break workflows on standard workstations. Reserve L2 for endpoints handling sensitive data.
Not testing GPOs in pilot OU: Deploy CIS GPOs to a test OU with representative hardware/software before organization-wide rollout to avoid breaking line-of-business applications.
Ignoring CIS benchmark version updates: CIS benchmarks update with each Windows feature release. Running an outdated benchmark misses new security settings and generates false compliance reports.
Forgetting local admin accounts: CIS benchmarks assume domain-joined endpoints. Standalone systems require LGPO.exe or Microsoft Intune for baseline enforcement.
No exception process: Applying 100% of CIS recommendations is rarely feasible. Without a formal exception process, teams either ignore hardening or break applications.