VDI (Virtual Desktop Infrastructure)

What is VDI?

VDI, or Virtual Desktop Infrastructure, is a desktop virtualization model in which user desktops are hosted in a data center or cloud environment rather than on individual physical machines. Users connect to their virtual desktops through secure protocols from laptops, thin clients, or other endpoints.

In a VDI environment, desktop images are centrally managed, user sessions run on virtual machines in a server environment, applications and configurations can be standardized, and data remains within the data center or cloud.

VDI enables IT teams to maintain greater visibility and control over desktop environments while supporting distributed and hybrid workforces.

How does VDI work?

VDI relies on a hypervisor platform that hosts multiple virtual desktops on shared infrastructure. Each user is assigned a virtual machine that runs a desktop operating system such as Windows.

When a user logs in, they connect to their assigned virtual desktop through a remote display protocol. IT administrators manage desktop images, apply policies, deploy applications, and enforce security settings from centralized management tools.

There are two primary VDI deployment models:

• Persistent VDI, where users receive the same virtual desktop each session
• Non-persistent VDI, where desktops reset to a baseline image after logoff

Non-persistent VDI improves standardization but increases the importance of centralized policy enforcement.

VDI vs VM: What’s the difference?

VDI and VM (virtual machine) are related but not identical concepts.

A VM is a virtualized instance of an operating system that runs on a hypervisor. VMs can host servers, desktops, or other workloads.

VDI is a specific use case of virtual machines focused on delivering virtual desktops to end users.

Key differences in VDI vs VM:

• VDI delivers user desktops; VMs may host any workload
• VDI environments require user session management and desktop image control
• VDI emphasizes user experience and centralized desktop governance
• Standalone VMs are often used for servers or testing environments

Understanding VDI vs VM is important when designing security and policy controls, since user-driven desktop sessions introduce different privilege and application risks than server workloads.

Why is VDI security challenging?

While VDI centralizes infrastructure, it does not eliminate endpoint risk. Users may still require elevated privileges within their virtual desktops, and if local administrator rights are granted broadly, attackers can exploit those permissions just as easily as on physical endpoints. Misconfigured policies can also propagate quickly across pooled environments.

Common VDI security challenges include managing privilege escalation within shared infrastructure, controlling application execution inside virtual desktops, preventing configuration drift in persistent desktops, maintaining consistent policy enforcement across hybrid environments, and supporting legacy applications that require elevation.

Because VDI environments often rely on baseline images, policy enforcement must be dynamic and context-aware rather than static.

Use cases

• Supporting secure remote and hybrid workforces
• Centralizing desktop management and patching
• Enforcing standardized Windows configurations
• Delivering desktops to contractors or temporary staff
• Reducing data exposure on physical endpoints
• Supporting bring-your-own-device access models

How Netwrix can help

VDI centralizes desktop infrastructure, but it does not replace granular Windows policy enforcement or least privilege controls inside each virtual desktop session.

Netwrix PolicyPak extends policy management and application control into VDI environments. Organizations can:

• Remove unnecessary local admin rights inside virtual desktops without breaking approved applications
• Go beyond Group Policy and Group Policy Preferences and implement settings that the in-box systems just don’t have (like Scripts, Triggers, File Associations, Browser Control and more.)
• Enforce just-enough privilege at the process and application level
• Apply granular Windows policy settings across persistent and non-persistent VDI pools
• Block unauthorized executables, scripts, and macros within virtual sessions
• Consolidate and simplify Group Policy objects used in desktop images
• Replace standing administrative group membership with policy-based, rule-bound elevation

PolicyPak ensures that VDI desktops remain secure, consistent, and aligned with least privilege principles, regardless of where users connect from.

When centralized desktops are paired with controlled elevation and modern application control, VDI becomes a security advantage instead of a risk multiplier.