Case studies. Security

PCI DSS segmentation testing

The team created several hardware connect-back appliances and used it in a PCI DSS segmentation testing engagement to uncover impactful network vulnerabilities.

The challenge

The penetration testing team was tasked with segmentation testing for a sample of the customer's private subnet (both CDE, DMZ, and management subnets). The project required onsite testing, which was not possible with the time constraints of the project (approx. 2 days) and quarantine measures in the Customer's country.

The solution

The team created and mailed the customer mobile connect-back jumphosts that was later used to establish initial access, conduct network reconnaissance, and discover network and service-level vulnerabilities that may break segmentation.

The Attack Lifecycle

Initial Access

Several mobile jumphosts was created that connected back to our infrastructure over VPN. These were installed in every sampled subnet in scope.


After network access was established, traffic inspection and various types of network scanning were conducted to collect information about the networking setup.

Traffic analysis

Broadcast network traffic was analyzed, and exploitable endpoint and router configurations were identified that could allow for MitM attacks (e.g. NBNS poisoning, DHCPv6 poisoning, or abusing dynamic routing protocols).

Network filter evasion

A tunnel from segmented portions of the network was built to the Internet utilizing various techniques to highlight segmentation errors.


Despite segmentation testing not being that impressive from a technical perspective, this case demonstrates client accommodation and rapid problem solving that Tenendo is known for. When working with us, you can be sure that we come up with an easy solution to any project constraints or specific requirements that you might have. We are very flexible both with scheduling, and our penetration testing approach.

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