ENTERPRISE SECURITY HARDENING PLAN FOR HCI

ENTERPRISE SECURITY HARDENING PLAN FOR HCI

Platforms Covered

Nutanix AOS / AHV
VMware vSphere / vSAN
HPE SimpliVity (ESXi / Hyper-V)

Security Priorities

Ransomware resilience
Management plane hardening
Insider-threat protection
Backup & DR security
Regulatory compliance

What You Will Learn

By completing this Enterprise Security Hardening Plan, you will learn how to design, implement, and operate a fully hardened, multi-platform HCI environment built for ransomware defense, compliance, resiliency, and least-privilege operations. Specifically, you will learn how to:

Management & Identity Security

Architect a dedicated and isolated management plane for Nutanix, VMware, and SimpliVity.
Enforce MFA, RBAC, API security, and privileged access controls across all HCI platforms.
Disable insecure access paths and implement identity federation with AD/LDAP/SAML.

Hypervisor Hardening

Apply STIG/CIS-aligned hardening for AHV, ESXi, and Hyper-V.
Implement Secure Boot, TPM, lockdown mode, and service restriction on each hypervisor type.
Enforce VM-level security including vTPM, Shielded VMs, and hardened console access.

Storage, Data Protection & Ransomware Controls

Implement encryption at rest/transit using NKE, vSAN Encryption, and SimpliVity AES-256.
Apply immutability across snapshots, backups, clones, and protection domains.
Build a 3-2-1-1-0 backup strategy and secure backup identities and transport channels.

Network & Segmentation Security

Design Zero Trust segmentation using AHV Flow, VMware NSX, and Hyper-V ACL/SDN.
Enforce deny-all microsegmentation and application-based firewalling.
Harden north–south ingress/egress, VLAN structure, and virtual switch security.

Guest OS & Workload Hardening

Apply CIS baselines to Windows/Linux workloads using automated tooling (Ansible/DSC/GPO).
Enforce EDR/XDR, credential protection, and secure remote access.
Build VM lifecycle policies for patches, services, and secrets management.

Backup, DR & Resilience Architecture

Configure platform-native DR tools (Leap, Mine, SRM, VCDR, SimpliVity Rapid DR).
Perform DR failover testing, replication validation, and ransomware rollback procedures.
Integrate immutability and air-gapped copies into an enterprise-grade resilience plan.

Logging, Monitoring & Response

Centralize logs from Prism, vCenter, SimpliVity, hypervisors, and VMs to a SIEM.
Configure alerting for privilege escalations, failed logins, snapshots, and config drift.
Integrate SOAR automation for containment and forensic workflows.

Physical, Firmware & Hardware Security

Establish datacenter physical access controls, audit mechanisms, and surveillance retention.
Harden BMC/iLO/iDRAC through segmentation, MFA, and certificate requirements.
Implement TPM/TXT/SEV hardware security features and lifecycle firmware governance.

Compliance & Governance

Map HCI security controls to NIST 800-53, HIPAA, PCI-DSS, CIS, and DoD STIG.
Use operational checklists to enforce repeatable, auditable security operations.
Build an enterprise-ready hardened architecture that withstands insider threats and ransomware.

___________________________________________________________________________________

TABLE OF CONTENTS

Management Plane Hardening
Hypervisor Hardening
Storage & Data Protection Hardening
Network & Segmentation Security
Guest OS / VM Workload Hardening
Identity, Access, & Least Privilege
Backup / DR / Ransomware Resilience
Logging, Monitoring, & Response
Physical, Firmware & Hardware Security
Compliance Mapping Checklist

MANAGEMENT PLANE HARDENING

Applies to: Nutanix Prism, vCenter Server, SimpliVity OmniStack / CVM, Hyper-V Manager, SCVMM

Step-by-step

Isolate management networks

Create a dedicated management VLAN inaccessible from user subnets.
Apply firewall rules:

Allow only admin jump boxes → management VLAN
Deny all inbound internet → management services

Enable MFA everywhere

Nutanix Prism Central → Enable 2FA or SAML/MFA via IdP
VMware vCenter → Enable SAML/ADFS MFA
Hyper-V / SCVMM → Require MFA via Azure AD or RADIUS

Disable direct console login

Disable root and administrator local login on:

ESXi hosts except break-glass
AHV hosts (CVM shell only when required)
Hyper-V hosts (PowerShell Remoting only)

Apply RBAC with least privilege

Create role categories:

HCI Admin
VM Operator
Security Auditor
Backup/DR Operator

Deny global privileges such as “modify cluster” to VM operators.

API hardening

Disable public API exposure
Require OAuth/SAML tokens with minimal scopes
Rotate API keys at least every 90 days

HYPERVISOR HARDENING

Platforms: AHV, VMware ESXi, Hyper-V

Nutanix AHV Hardening

Enable Secure Boot and TPM on all nodes.
Disable unused AHV services:

SSH disabled by default; enable only temporarily.

Enforce CVM & AHV STIG-like baselines:

Lock down file permissions
Disable password-based SSH auth
Enforce strong crypto (FIPS mode if required)

VMware ESXi Hardening

Apply CIS ESXi Level 1 baseline:

Disable ESXi shell, SSH
Configure DCUI lockdown mode

Enable Host Lockdown Mode
Configure TPM 2.0 + Secure Boot
Disable services:

ESXi shell
SSH
CIM unless required

Enforce VM Encryption and vTPM (PCI/HIPAA alignment)

Microsoft Hyper-V (SimpliVity) Hardening

Enable Secure Boot for all VMs
Enable Shielded VMs for sensitive workloads
Disable:

SMBv1
Legacy protocols

Harden Windows host using CIS Windows Server Benchmarks

STORAGE & DATA PROTECTION HARDENING

Applies to: Nutanix DSF, VMware vSAN, SimpliVity DVP

Step-by-step

Enable encryption-at-rest (mandatory for PCI/HIPAA):

Nutanix NKE encryption with external KMIP server
vSAN Encryption using KMS
SimpliVity AES-256 built-in encryption

Enable encryption in transit

AHV → Enable cluster TLS 1.2+
vSAN → Enable vSAN data-in-transit encryption
SimpliVity → Validate dedup/compression encryption settings

Implement immutability / anti-ransomware

Nutanix “AOS snapshots + immutability”
VMware “vSAN snapshot plus VCDR immutables”
SimpliVity “rapid rollback immutable clones”

Restrict access to storage control planes

Prism, vCenter, SimpliVity Local Management
Block all storage ports from non-management VLANs

NETWORK & SEGMENTATION SECURITY

Applies to: AHV Flow, VMware NSX, vSphere DVSwitch, Hyper-V vSwitch

Step-by-step

Implement microsegmentation

Nutanix Flow: Apply categories & firewall policies
NSX DFW: Apply group-based policies
Hyper-V: Use ACLs or SDN Firewall if available

Zero Trust east-west control

Deny all VM-to-VM traffic by default
Allow only explicit dependencies

Secure north-south traffic

Put firewalls at cluster ingress/egress
Enforce TLS1.2+ for all endpoints

Harden network services

Disable unused VLANs
Limit DHCP & DNS access
Disable promiscuous mode / forged transmits / MAC changes

GUEST OS / VM WORKLOAD HARDENING

Applies to Windows, Linux, Appliances

Step-by-step

Apply CIS benchmarks via automated tools (Ansible, DSC, GPO)
Enforce EDR/XDR agent installation
Disable unnecessary services
Apply OS patch schedule separate from HCI firmware/LCM
Harden credentials using:

LAPS
Credential Guard
SSH key-based access only

IDENTITY, ACCESS & INSIDER THREAT PROTECTION

Step-by-step

Centralize authentication:

Prism → AD/LDAP/SAML
vCenter → AD Identity Federation
Hyper-V → AD/Azure AD

Apply least privilege roles across platforms
Rotate all service accounts 60–90 days
Enable privileged session recording (e.g., CyberArk)
Audit all privilege escalations

BACKUP / DR / RANSOMWARE RESILIENCE

Step-by-step

Implement 3-2-1-1-0 strategy:

3 copies
2 media types
1 off-cluster backup
1 immutable
0 backup verification errors

Secure backup accounts:

No domain admins
Separate backup and production credentials

Harden backup transports:

TLS 1.2+
No SMBv1
No NFS without Kerberos

Perform quarterly DR failover tests
Use platform-native recovery:

Nutanix Leap or Mine
VMware VCDR / SRM
SimpliVity Rapid DR

LOGGING, MONITORING & RESPONSE

Applies to: Prism Central, vCenter, SimpliVity, Windows/Linux VMs

Step-by-step

Forward logs to SIEM:

Prism → Syslog → SIEM
ESXi/vCenter → Syslog → SIEM
SimpliVity → Events → Syslog

Enable:

Audit logging
API access logs
Change tracking
Hypervisor security events

Configure alerting for:

Failed logins
Config changes
Suspicious VM snapshot creation
Sudden replication deletions

Apply automated response via SOAR if available

PHYSICAL, FIRMWARE & HARDWARE SECURITY

Step-by-step

Secure datacenter access (badges + cameras)
Update:

BIOS
BMC (iLO/iDRAC)
NIC firmware
HBA/RAID firmware

Enable hardware protections:

TPM 2.0
Intel TXT / AMD SEV if supported

Disable unused onboard ports
Ensure BMC interfaces are on isolated management networks

COMPLIANCE MAPPING (SUMMARY)

Requirement	Controls Covered
NIST 800-53	AC, AU, SC, SI, CM, CP, IA
CIS Benchmarks	AHV, ESXi, Windows, Linux, Network
HIPAA	Encryption, access control, audit logging
PCI-DSS	Encryption, segmentation, MFA
STIG (DoD)	Hardening baselines, audit, secure configs

HARDENED ARCHITECTURE DOCUMENT

Hyper-Converged Infrastructure Security Architecture
Date: 11/14/2025
1. Executive Summary

This Hardened Architecture Document defines the security architecture, controls, and operational governance for a multi-platform Hyper-Converged Infrastructure (HCI) environment consisting of:

Nutanix AOS with AHV
VMware vSphere/vSAN
HPE SimpliVity on ESXi and Hyper-V

The architecture integrates control requirements from NIST 800-53, CIS Benchmarks, HIPAA, PCI-DSS, and DoD STIG-aligned practices.

The objective of this document is to establish a secure, resilient, and compliant HCI platform capable of resisting ransomware, unauthorized access, insider threats, and operational misconfigurations while supporting enterprise uptime and regulatory obligations.

This architecture focuses on the following security priorities:

Management plane hardening
Ransomware resilience
Backup and DR security
Insider-threat protection
Regulatory compliance alignment

This document covers ten primary security domains: compute, storage, hypervisor, network, identity, operations, monitoring, data protection, endpoint security, and physical/firmware controls.

2. Architecture Overview

2.1 System Description

The HCI environment includes three separate but integrated platforms:

Nutanix AHV clusters supporting general-purpose workloads
VMware vSphere/vSAN clusters supporting Tier 1 workloads
HPE SimpliVity nodes supporting edge/regional workloads

All platforms are connected using segmented management networks, dedicated vLANs for storage fabric, and segregated tenant or workload networks. Identity, logging, and monitoring systems are centralized across the environment.

2.2 Logical Architecture Diagram (ASCII)

┌─────────────────────────────────────────┐

│ Enterprise Identity │

│ (AD / LDAP / SAML / MFA Provider) │

└─────────────────────────────────────────┘

│

▼

┌────────────────────────────────────────────────────────┐

│ Management Network │

│ Prism Central | vCenter | SimpliVity Manager | SCVMM │

└────────────────────────────────────────────────────────┘

│ │ │

▼ ▼ ▼

┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐

│ Nutanix Cluster │ │ vSphere Cluster │ │ SimpliVity Node │

│ AHV + AOS + DSF │ │ ESXi + vSAN │ │ ESXi/Hyper-V │

└─────────────────┘ └─────────────────┘ └─────────────────┘

│ │ │

▼ ▼ ▼

Workload Networks / App Subnets / Segmented vLANs

3. Security Objectives

The hardened architecture is designed to ensure the following:

3.1 Confidentiality

Encryption at rest and in transit for all platforms
Access control via MFA and strong RBAC
Segmentation of management, storage, and workload traffic

3.2 Integrity

Secure boot and TPM validation
Immutable backups and snapshots
Configuration drift detection

3.3 Availability

Multi-node cluster redundancy
Replication policies for DR
Automated remediation and health monitoring

3.4 Compliance

Meets requirements for:

NIST 800-53 (AC, AU, SC, CP, SI, CM families)
HIPAA Security Rule
PCI-DSS segmentation and encryption
CIS Benchmarks for hypervisors and guest OS
STIG-referenced security configurations

4. Management Plane Hardening

4.1 Management Network Architecture

Requirements:

Dedicated management VLAN
No north-south user access
Firewall access limited to privileged admin workstations (“jump boxes”)

Controls:

Platform	Management Component	Required Security
Nutanix AHV	Prism Element / Prism Central	MFA, TLS1.2+, RBAC
vSphere	vCenter Server	AD integration, MFA, lockdown mode
SimpliVity	OmniStack/Arbiter	TLS, AD integration, restricted networks

4.2 Identity & Access

Enforce MFA for all console and API access
Disable all default local administrator access (except break-glass)
Enforce session timeouts and audit logging

4.3 API Security

Disable anonymous API access
Use scoped tokens for automation
Rotate keys every 90 days

5. Hypervisor Hardening

5.1 Nutanix AHV

Enable Secure Boot + TPM
Disable SSH except during break-glass operations
Enforce CVM node hardening standards
Use Nutanix “Cluster Lockdown Mode” for elevated protection

5.2 VMware ESXi (vSphere)

Lockdown Mode required for all hosts
Disable ESXi Shell and SSH
Enable vTPM for supported VMs
Enforce CIS ESXi and vSphere hardening guidelines

5.3 Microsoft Hyper-V (SimpliVity)

Apply Secure Boot for all guest VMs
Enforce virtualization-based security (VBS)
Disable legacy protocols and SMBv1

6. Storage and Data Protection Hardening

6.1 Encryption At Rest

Nutanix NKE with external KMS (KMIP)
VMware vSAN Encryption with external KMS
SimpliVity built-in AES-256 encryption

6.2 Encryption In Transit

TLS 1.2+ across node-to-node communication
vSAN data-in-transit encryption
Nutanix secure transport between CVMs

6.3 Data Integrity Controls

Immutability for snapshots and backups
Storage segmentation from workload networks
Protection policies enforcing minimum retention

7. Network & Segmentation Security

7.1 Microsegmentation

AHV Flow for application-based policies
VMware NSX Distributed Firewall
Hyper-V ACL/SDN Firewall rules

7.2 Traffic Controls

Deny-all baseline policies for east-west traffic
Allow-only application dependency rules
Disable promiscuous mode, forged transmits, and MAC spoofing

7.3 North-South Security

Perimeter firewalls
SSL inspection where appropriate
Restrict management ingress to known IPs only

8. Backup, Disaster Recovery, and Ransomware Resilience

8.1 Backup Strategy

3-2-1-1-0 methodology
Immutable backup repository required
Backup networks separate from production

8.2 DR Strategy

Nutanix Leap or Mine for AHV
VMware SRM/VCDR
SimpliVity Rapid DR automation

8.3 Ransomware Resilience Controls

Immutable clones, snapshots
MFA for backup administrators
Air-gapped or offline backup copies
Quarterly DR failover tests

9. Logging, Monitoring & Operational Security

9.1 Centralized Logging

All systems forward logs to SIEM:

Source	Log Types
Prism	admin actions, cluster health
vCenter	authentication, VM lifecycle, host events
SimpliVity	replication and backup events
Hypervisors	security, audit, configuration
Guest OS	EDR, authentication, syslogs

9.2 Monitoring & Alerts

Alerts should be configured for:

Failed login attempts
Unauthorized configuration changes
Snapshot creation or deletion events
Backup policy modifications
Node failures or resource anomalies

9.3 Incident Response Integration

Automated SOAR workflows for high-impact alerts
Forensic snapshot workflow templates
Hypervisor-level isolation procedures

10. Physical & Firmware Hardening

10.1 Physical Security

Controlled datacenter access
Dual-factor cabinet access
CCTV and access logs retained for 1 year

10.2 Firmware & Hardware

Quarterly firmware lifecycle updates
Harden BMC/IPMI/iDRAC/iLO:

Dedicated management VLAN
MFA or certificate-based access
Disable default credentials

10.3 Hardware Root-of-Trust

TPM 2.0 required
Enable Intel TXT or AMD SEV where supported

Appendix A — Compliance Mapping

Control Family	NIST 800-53	HIPAA	PCI-DSS	CIS	STIG
Access Control	AC	164.312	7, 8	CIS L1	Yes
Audit Logging	AU	164.308	10	CIS L1	Yes
Encryption	SC	164.312	3, 4	CIS	Yes
DR/Backup	CP	164.308	12	CIS	Partial
Configuration	CM	164.306	6	CIS	Yes

Appendix B — Operational Checklist

Management

MFA enabled everywhere
Local accounts disabled
API keys rotated

Hypervisor

Secure Boot enabled
SSH disabled
Lockdown mode enabled

Storage

Encryption at rest enabled
Immutability applied
Data-in-transit encryption applied

Network

Microsegmentation enforced
NSX/Flow policies active
Promiscuous mode disabled

Backup

Immutable backup copy
DR tested
Segregated backup network

Monitoring

Logs to SIEM
Alerts configured
SOAR playbooks integrated

Virtology