Penetration Testing

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Identify Security Vulnerabilities Before Others Do

In einer zunehmend von Hackerangriffen bedrohten Geschäftswelt müssen Unternehmen dringend Ihre IT-Systeme schützen, andernfalls sind Investitionen in In a business world increasingly threatened by cyberattacks, companies must urgently protect their IT systems. Otherwise, investments in product development, patents, and business processes are at risk. To reduce the likelihood of successful attacks, it is crucial for manufacturers and operators to conduct regular penetration tests. Penetration testing is a highly effective tool for identifying potential security vulnerabilities, determining remediation steps, and enhancing overall security. By performing regular penetration tests, companies can proactively address threats and better protect their data and business operations.

Our Offer for You

With our expertise, we are equipped to thoroughly test your products or systems. We are here to provide guidance and offer the following security testing services:

IoT & Embedded

Using state-of-the-art laboratory equipment, we can analyze all aspects of your embedded systems and IoT devices, from individual sensors to complete ecosystems. As part of our security tests, we provide comprehensive analysis of:

All internal (e.g., JTAG, I²C, SPI) and external interfaces (e.g., USB, Ethernet), including wireless interfaces (e.g., Wi-Fi, Bluetooth/BLE, ZigBee, LoRaWAN, cellular networks)
Internal (e.g., onboard flash memory) and external storage (e.g., SD cards)
Firmware, including network services and firmware update processes
Automotive hardware and software, including control units, entire vehicles, and mobile apps for vehicle control

Web Applications and Services

In the realm of web components, we provide penetration testing in accordance with established guidelines like the OWASP Web Security Testing Guide (WSTG). Our services include:

Web applications built on a wide range of technologies
APIs (e.g., REST, SOAP)

We also conduct thorough source code analysis to identify vulnerabilities in your applications and APIs.

OT- & IT-Infrastructures and Components

By conducting security tests on your OT and IT environments, you can assess the security of your infrastructure components and internal networks. We offer comprehensive analysis of:

Perimeter systems
Corporate networks
Cloud environments
Infrastructure as Code architectures
Hardening measures for servers, databases, etc.
Connections between OT and IT infrastructures
Production facilities and control systems

Mobile Applications

For mobile applications (Android, iOS), we also offer penetration testing based on well-known and up-to-date guidelines such as the OWASP Mobile Application Security Testing Guide (MASTG). Depending on your needs, we conduct the following analyses:

Static and dynamic analysis of mobile applications
Examination of all communication channels (e.g., communication with backend systems)
Source code analysis

Our Methodology

The penetration testing process of BDO Cyber Security GmbH is based on the five-step approach defined in “Study A Penetration Testing Model”, published by the German Federal Office for Information Security (BSI).

Phase 1

Preparation

During the first phase of the penetration test, test objectives as well as organizational, technical, and legal aspects are coordinated with the client, including:

Components that should be in scope of the test as well as associated key aspects of testing (test scope),
Components and test cases that should not be in scope of the test (out of scope),
Overall testing strategy, including:
- Information basis (e.g., Black-Box, Gray-Box, or White-Box approach)
- Level of aggressiveness (e.g., passive scanning, cautious, balanced, or aggressive)
- Approach (covert or overt)
- Starting point for the test (external perspective, internal perspective)
Potential (technical) issues that might affect the testing procedure and results
Contacts list, including an emergency contact on either side in case that urgent communication or help is required

The results of this phase are documented in a contract, which serves as the legal basis for the penetration testing engagement.

Phase 2

Reconnaissance

In phase 2, the information and documents provided by the customer are examined, thereby gathering preliminary information about the test object, e.g.,

Used technologies, frameworks, and software versions
Reachable hosts and / or (sub-)domains
Accessible (hardware) interfaces

In parallel, it will be verified whether access to all test components is possible.

Phase 3

Analysis of Information

Based on the information gathered during previous phases, the list of planned test cases - and therefore the time required - can be adjusted for selected components according to their relevance. This involves identifying, analyzing, and prioritizing potential threats and attack vectors (e.g., based on damage potential, likelihood of success, and possible impacts).

Phase 4

Active Intrusion Attempts

Following the initial analyses, active intrusion attempts are conducted. For this purpose, selected test cases for each component in scope will be executed.

If a test case reveals a (potential) vulnerability, its exploitability and impact are examined:

Exploitability refers to conditions affecting the success of an intrusion attempt, such as the accessibility of the vulnerable component, required permissions and expertise, safeguards and protection mechanisms, etc.
Impact refers to the consequences that a successful attack would have, e.g., on confidentiality, integrity and availability of systems, user accounts or data

Furthermore, evidence is gathered for each vulnerability, such as screenshots or step-by-step instructions to reproduce the attack or provoke specific system behaviors.

If applicable, activities from phases 2 and/or 3 will be repeated based on the results and information obtained during this phase. This may involve adding or adjusting test cases, as the presence of certain vulnerabilities could indicate susceptibility to other types of attacks.

Phase 5

Final Analysis and Clean-Up

The penetration test is concluded with the Final Analysis and Clean-Up Phase. During the final analysis, all results from the previous phases are compiled into a detailed report, including:

A summary of the test approach and test results, including an assessment of the test object’s overall security level
A detailed description of each discovered vulnerability, including proof-of-concept and screenshots
A rating of each vulnerability regarding of its severity
General recommendations for remediation or mitigation of the identified vulnerabilities

If necessary, remnants of the test activities are also removed during this phase.

All tests are primarily conducted manually. This approach allows for the identification of vulnerabilities that automated tools, such as vulnerability scanners, might miss. If feasible, individual test steps may be facilitated using (semi) automated tools. Results, produced by such tools, are reviewed, and analyzed by the test team. If in doubt, automated tests are repeated manually, thereby eliminating false positives.

Testing Based on Established Frameworks

In the context of the penetration test, test cases are selected and executed based on testing guidelines. While the BSI model for penetration tests categorizes test cases into modules for information gathering (I-Modules) and intrusion attempts (E-Modules), BDO Cyber Security GmbH employs its own framework. The primary reason for this is that the I- and E-Modules are limited to certain technologies, which restricts the testing process.

BDO Cyber Security GmbH's framework is based on recognized, current standards. Specifically, the following guidelines are used depending on the specific test subject:

Web Applications and Web Services: Testing of web-based solutions is conducted based on the OWASP Web Security Testing Guide (WSTG).
Mobile Applications: Testing of mobile applications (Android and iOS) is carried out using the OWASP Mobile Application Security Testing Guide (MASTG).
IT Infrastructures and Infrastructure Components: Testing of IT infrastructures and individual infrastructure components is based on a test case catalog developed and maintained by BDO Cyber Security GmbH.
Hardware Devices: Testing of hardware devices is based on the OWASP IoT Security Testing Guide as well as a test case catalog developed and maintained by BDO Cyber Security GmbH.
Security Audits/Hardening Checks: Security audits and hardening checks are performed based on the CIS Benchmarks.