Network Segmentation

Overview

Segmentation is a method of creating secure zones in data centers and cloud deployments that allows companies to isolate workloads from one another and secure them individually, typically using policies. A useful way to test the effectiveness of your segmentation is to ensure that your network segments are properly separated, e,g, your Development is separated from your Production, your applications are separated from one another etc. To security test is to verify that your network segmentation is configured properly. This way you make sure that even if a certain attacker has breached your defenses, it can’t move laterally from point A to point B.

Segmentation is key to protecting your network, reducing the attack surface and minimizing the damage of a breach. The Monkey can help you test your segmentation settings with its cross-segment traffic testing feature.

Configuration

Important configuration values:

  • Network -> Network analysis -> Network segmentation testing This configuration setting allows you to define subnets that should be segregated from each other. If any of provided networks can reach each other, you’ll see it in security report.
  • (Optional) Network -> Scope You can disable Local network scan and leave other options by default if you only want to test for network segmentation without any lateral movement.
  • (Optional) Monkey -> Post Breach Actions If you only want to test segmentation in the network, you can turn off all post breach actions. These actions simulate attacker’s behaviour after getting access to a new system, so they might trigger your defence solutions which will interrupt segmentation test.

Execute Monkeys on machines in different subnetworks manually, by choosing “1. Run Monkey” from the left sidebar menu and clicking on “Run on machine of your choice”. Alternatively, you could provide valid credentials and allow Monkey to propagate to relevant subnetworks by itself.

Note that if Monkey can’t communicate to the Island, it will not be able to send scan results, so make sure all machines can reach the island.

How to configure network segmentation testing

Assessing results

Check infection map and security report for segmentation problems. Ideally, all scanned nodes should only have edges with the Island Server.

Map