Modern Windows on Arm Security: Global Secure Access Client Now in Public Preview

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Introduction

Microsoft has released the Global Secure Access client for Windows on Arm devices in public preview, marking a significant step in secure remote access for modern architectures. This client, available via the Entra portal, enhances identity-centric security for hybrid work environments. Below, we explore key technical aspects, deployment steps, and security best practices.

Learning Objectives

  • Understand the role of the Global Secure Access client in modern security architectures.
  • Learn how to deploy and configure the client on Windows on Arm devices.
  • Explore security hardening techniques for Arm-based endpoints.

You Should Know

1. Downloading the Global Secure Access Client

Command/PowerShell:

 Navigate to Entra portal and download the client
Invoke-WebRequest -Uri "https://entra.microsoft.com" -OutFile "GSA_Client_Arm64.msi"

Steps:

  1. Log in to the Entra portal with admin credentials.

2. Navigate to Global Secure Access > Downloads.

  1. Select the Windows on Arm version and download the MSI installer.

4. Run the installer with elevated privileges.

2. Enabling Zero Trust Policies

Entra ID PowerShell Command:

Connect-AzureAD
New-AzureADPolicy -Definition @('{"ZeroTrust":{"Enforced":true}}') -DisplayName "Arm64-ZeroTrust" -Type "ZeroTrustPolicy"

Steps:

  1. Ensure your Entra ID tenant has Zero Trust licensing enabled.
  2. Apply the policy to Arm64 device groups for conditional access.

3. Network Hardening for Arm Devices

Windows Firewall Rule (Admin PowerShell):

New-NetFirewallRule -DisplayName "GSA-Arm64-Secure" -Direction Inbound -Action Allow -Program "C:\Program Files\Microsoft GSA\gsa_client.exe" -Profile Any

Steps:

  1. Restrict inbound traffic to only the GSA client executable.

2. Audit rules with `Get-NetFirewallRule -DisplayName “GSA-Arm64-Secure”`.

4. Monitoring Secure Connections

Event Log Query (PowerShell):

Get-WinEvent -LogName "Microsoft-Windows-GSA/Operational" -MaxEvents 50 | Format-Table -AutoSize

Steps:

  1. Use this to troubleshoot connection failures or policy violations.
  2. Forward logs to Azure Sentinel for SIEM integration.

5. API Security for Arm Clients

REST API Call (via Curl):

curl -X POST -H "Authorization: Bearer $token" https://api.entra.microsoft.com/v1.0/deviceManagement/managedDevices -d '{"deviceType":"Arm64","isCompliant":true}'

Steps:

1. Generate a token via `az account get-access-token`.

  1. Enforce compliance checks for Arm devices accessing APIs.

What Undercode Say

  • Key Takeaway 1: The Arm64 client bridges gaps in secure access for emerging hardware, but legacy app compatibility remains a challenge.
  • Key Takeaway 2: Zero Trust policies must be explicitly configured for Arm, as x86 rules don’t auto-apply.

Analysis:

Microsoft’s move signals broader Arm adoption in enterprise security. However, admins must audit third-party drivers and use hardware-backed attestation (e.g., Pluton) to mitigate firmware risks. Future updates may integrate AI-driven anomaly detection for Arm-specific threat patterns.

Prediction

By 2026, 40% of enterprise endpoints will run on Arm, necessitating rearchitected security tools. Expect Microsoft to unify x86/Arm policy management and add AI-based behavioral profiling for Arm processes.

IT/Security Reporter URL:

Reported By: Peter Lenzke – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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