Hardening a Modern Privileged Access Workstation

Throughout this series we’ve explored why Privileged Access Workstations exist, when they’re appropriate and how to choose the right administrative environment.

Whether you’ve selected a dedicated physical PAW, a Windows 365 Cloud PC or another virtual administrative environment, one principle remains the same.

A Privileged Access Workstation is only as secure as the controls used to protect it.

Simply deploying a dedicated workstation doesn’t automatically create a trusted administrative environment.

That trust must be earned through careful design, configuration and ongoing management.

Start With a Secure Foundation

Every Privileged Access Workstation should begin with a modern, supported operating system.

For most organisations this means Windows 11 Enterprise, managed through Microsoft Intune and enrolled into Microsoft Defender for Endpoint.

The objective isn’t simply to deploy Windows.

It’s to create a device that is secure by design, continuously managed and capable of responding to modern threats.

Before considering additional security controls, every PAW should have:

  • Windows 11 Enterprise
  • Microsoft Intune management
  • Microsoft Defender for Endpoint
  • BitLocker enabled
  • TPM 2.0
  • Secure Boot
  • Automatic patch management
  • Device compliance policies

These controls establish the baseline upon which everything else is built.

Identity Is Still Your First Line of Defence

The workstation is only one part of the privileged access journey.

Strong identity controls remain essential.

Where possible, privileged identities should authenticate using phishing-resistant authentication such as:

  • FIDO2 Security Keys
  • Device-bound Passkeys
  • Windows Hello for Business

Privileged identities should never rely on weaker authentication methods simply because they’re using a dedicated administrative workstation.

The workstation increases assurance.

It doesn’t replace strong authentication.

Conditional Access Still Applies

One misconception is that Privileged Access Workstations somehow remove the need for Conditional Access.

In reality, the opposite is true.

Conditional Access should enforce that privileged identities only authenticate from trusted administrative environments.

Examples include:

  • Compliant devices only
  • Approved authentication strengths
  • Administrative locations where appropriate
  • Sign-in risk evaluation
  • Device risk evaluation
  • Authentication context where required

The PAW becomes one of the conditions that establishes trust.

Privileged Identity Management

Administrative roles should remain eligible wherever possible.

Using Privileged Identity Management ensures administrators only activate elevated permissions when they’re genuinely required.

A Privileged Access Workstation should become the environment from which privileged role activation takes place.

This combines workstation assurance with least privilege and just-in-time administration.

Reduce the Attack Surface

A Privileged Access Workstation should remain intentionally simple.

Every unnecessary application increases the attack surface.

Typical controls include:

  • Remove unnecessary applications
  • Restrict local administrator access
  • Minimise browser extensions
  • Disable consumer experiences
  • Prevent unnecessary software installation
  • Restrict administrative tools to those genuinely required

The objective isn’t to create an inconvenient device.

The objective is to create a predictable administrative environment.

Windows Security Features

Modern Windows includes several features specifically designed to protect privileged environments.

Examples include:

  • Credential Guard
  • Hypervisor-Protected Code Integrity (HVCI)
  • Local Security Authority (LSA) Protection
  • Microsoft Defender SmartScreen
  • Secure Boot
  • Virtualisation-Based Security (VBS)

These features significantly increase the difficulty of credential theft and local privilege escalation.

Where supported by hardware, they should form part of every modern PAW.

Windows Defender Application Control

If there is one technology capable of dramatically reducing endpoint risk, it’s application control.

Windows Defender Application Control (WDAC) allows organisations to define exactly which applications are permitted to execute.

Rather than attempting to detect malicious software after it has started, WDAC prevents unauthorised code from executing in the first place.

While implementation requires planning and testing, it represents one of the strongest endpoint security controls available for high-assurance administrative environments.

Attack Surface Reduction Rules

Microsoft Defender Attack Surface Reduction (ASR) rules help block common attack techniques before they can be exploited.

These include protecting against:

  • Office application abuse
  • Credential theft
  • Malicious scripts
  • Process injection
  • Ransomware techniques
  • Exploitation of vulnerable applications

Not every rule is appropriate for every organisation.

Testing remains essential.

However, ASR should be considered a core component of a hardened PAW.

Browser Hardening

For many administrators, the browser becomes the primary administrative tool.

It therefore deserves the same level of attention as the operating system.

Consider:

  • Microsoft Edge management through Intune
  • Restrict browser extensions
  • Disable password saving
  • Disable profile synchronisation
  • Enable Microsoft Defender SmartScreen
  • Configure enterprise security policies
  • Separate administrative browser profiles where appropriate

The browser should support administration.

It shouldn’t become another source of unnecessary risk.

Logging and Monitoring

Hardening isn’t complete without visibility.

Every Privileged Access Workstation should be monitored for:

  • Device compliance
  • Defender alerts
  • Risky sign-ins
  • Privileged role activation
  • Endpoint detections
  • Configuration drift

Security controls lose value if administrators don’t know when they’ve failed.

Hardening Is a Process

There is no single setting that transforms a device into a Privileged Access Workstation.

Instead, assurance is built through layers.

Strong authentication.

Secure hardware.

Modern Windows security features.

Endpoint protection.

Conditional Access.

Privileged Identity Management.

Continuous monitoring.

Each layer contributes towards establishing trust in the administrative environment.

Key Takeaways

A Privileged Access Workstation isn’t secure because it’s dedicated.

It’s secure because it’s deliberately designed, carefully configured and continuously managed.

The objective isn’t to deploy every available security feature.

It’s to implement the controls that provide the appropriate level of assurance for the privileged identities using the device.

Security is never achieved through a single technology.

It’s achieved through multiple layers working together.

What’s Next?

Deploying and hardening a Privileged Access Workstation is a significant milestone, but it’s only the beginning.

Like any security control, a PAW requires ongoing management to ensure it continues to provide the level of assurance it was designed to deliver.

Operating systems evolve.

Threats change.

Applications are updated.

Security policies drift.

Without regular maintenance and governance, even the most carefully designed administrative environment can gradually lose the trust it was intended to establish.

In the next article we’ll explore how to operate and maintain a modern Privileged Access Workstation, covering lifecycle management, monitoring, compliance, patching, auditing and the operational practices that keep administrative environments secure over time.