Microsoft Ignite 2019 – Securing Your Cloud Perimeter With Azure Network Security

  • Speaker: Sinead O’Donvan (Irish, by the accent)

Zero Trust Architecture document

7 pillars:

  • Identity
  • Devices
  • Data
  • Apps
  • Infrastructure
  • Networking – the focus here

Verify explicitly every access control

  • Being on the network is not enough

Use least privilege access

  • IP address is not enough

Assume breach

  • No one is perfectly secure. Identify the breach. Contain the breach. Do your best to stop breaches in the first place.

You cannot claim success:

  • It requires constant improvement.

Network Maturity Model

  • Traditional (most customers)
    • Few network security perimeters and flat open network
    • Minimal threat protection and static filtering
    • Internal traffic is not encrypted
  • Advanced
    • Many ingress/egress cloud micro-perimeters with some micro-segmentation
    • Cloud native filtering and protection for known threats
    • User to app internal traffic is encrypted
  • Optimal
    • Fully distributed ingress/egress cloud micro-perimeters and deeper micro-segmentation
    • ML-based threat protection and filtering with context-based signals
    • All traffic is encrypted

Three Cores of Azure Network Security

  • Segment – prevent lateral movement and data exfiltration
  • Protect – secure network with threat intelligence
  • Connect – embrace distributed connectivity … or face revolt from the users/devs

Deploy securely across DevOps process

Azure Features

  • Azure Firewall
  • Azure WAF
  • Azure Private Link
  • Azure DD0S Protection

Plus:

  • VNets
  • NSGs
  • UDRs
  • Load Balancer

Network Segmentation

3 approaches:

  • Host-based: an agent on the VM implements it
  • Hypervisor: Example, VMware SNX
  • Network controls

Azure Network Segmentation Controls

  • Subscription: RABC, logic isolation for all resources
  • Virtual network: An isolated and highly secure environment to run your VMs and apps. “This is the hero of segmentation”
  • NSG: Enforce and control network traffic security rules that allow or deny network traffic for a VNet or a VM.
  • WAF: Define application specific policies to protect web workloads.
  • Azure Firewall: Create and enforce connectivity policies using application, network and threat intelligence filtering across subscription(s) and VNet(s).

Multi-Level Segmentation

  • Connectivity:
    • Use both public or private IP. Public app interface is public, backend is private.
    • Choose cloud transit approach VNet peering or Virtual WAN.
    • Carefully control routing
  • Infrastructure
    • Segment across subscription, vnet, and subnet boundaries
    • Managed at an org level
  • Application
    • Enable application aware segmentation
    • Easily create micro perimeters
    • Managed at an application level

Azure Firewall Manager (Preview)

  • Central deployment and configuration
    • Deploy and configure multiple Azure Firewall instances
    • Optimized for DevOps with hierarchical policies
  • Automated Routing
    • Easily direct traffic to your secured hub for filtering and logging without UDRs
  • And more

Azure Web Application Firewall

Preview:

  • Microsoft threat intelligence
    • Protect apps against automated attacks
    • Manage good/bad bots with Azure BotManager RuleSet
  • Site and URI patch specific WAF policies
    • Customise WAF policies at regional WAF for finer grained protection at each host/listener or URI path level
  • Geo-filtering on regional WAF
    • Enhanced custom rule matching criterion

MS sees 20/30 DDoS attacks per day.

WAF as a Service

  • Barracuda
  • Radware

Both run in Azure.

Connectivity

It’s time to transform your network.

  • User to app moves to Internet centric connectivity
  • Application to backend resources use private connectivity
  • Redesign your network and network security models to optimize user experience for cloud
  • Continue to extend app delivery models and network security to the edge

Azure Firewall Manager

  • Easily create multiple secured virtual hubs (DMZ Hubs) in Azure
  • Use Azure Firewall or 3rd party security
  • Create global and local policies
  • Easy to set up connectivity
  • Roadmap:
    • Split routing – optimized O365 and Azure public PaaS

CheckPoint CloudGuard Connect will debut soon as a partner extension.

Azure Private Link

Highly secure and private connectivity solution for Azure Platform.

  • Private access from VNet resources, peered networks and on-premises networks
  • In-built data exfiltration protection
  • Predictable private IP addresses for PaaS resources
  • Unified experience across PaaS customer owned and marketplace services

Microsoft taking this very seriously. All new PaaS services “from Spring onwards” must support Private Link.

Azure Bastion

See previous posts on this – it requires more work IMO because it lacks VNet peering support and requires login via the Azure Portal – doesn’t support MSTSC or SSH clients.

Key Takeaways

  • Embrace zero trust network model
  • Segment your network and create micro-perimters with Azure Firewall, NSG, etc
  • Use a defense in depth security strategy with cloud native services
  • Enable WAF and DDoS
  • Explore Azure as your secure Internet edge with Azure Firewall Manager
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