Containers vs Virtual Machines – Attack Surfaces Explained

[MegaTux]

Security Deep Dive

Containers and virtual machines are both used to isolate workloads, but their security models are fundamentally different.

VMs isolate operating systems.
Containers isolate processes.

This difference directly impacts their attack surface and security risks.

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1. What Is an Attack Surface?

An attack surface includes everything an attacker can interact with:

• open ports and services
• web applications
• kernel interfaces
• file systems
• APIs and management interfaces
• virtualization layers (hypervisor / container runtime)

The smaller and more controlled the attack surface, the better.

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2. Virtual Machine Security Model

Code: Select all

Physical Server
└── Hypervisor
    ├── VM 1 (Linux)
    ├── VM 2 (Windows)
    └── VM 3 (Linux)

Each VM runs its own kernel and OS.

Isolation layer: Hypervisor

Examples:

• KVM
• VMware
• Hyper-V

Security advantage:

• strong isolation
• separate kernels
• difficult VM escape

Risk:

• hypervisor vulnerabilities
• management interfac

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