Many organizations offer security services and use terms such as security audit, network or risk assessment, and Penetration Test with overlapping meanings. By definition, an audit is a measurable technical assessment of a system(s) or application(s). Security assessments are evaluations of risk, meaning services used to identify vulnerabilities in systems, applications, and processes.
Penetration Testing goes beyond an assessment by evaluating identified vulnerabilities to verify if the vulnerability is real or a false positive. For example, an audit or an assessment may utilize scanning tools that provide a few hundred possible vulnerabilities on multiple systems. A Penetration Test would attempt to attack those vulnerabilities in the same manner as a malicious hacker to verify which vulnerabilities are genuine reducing the real list of system vulnerabilities to a handful of security weaknesses. The most effective Penetration Tests are the ones that target a very specific system with a very specific goal. Quality over quantity is the true test of a successful Penetration Test. Enumerating a single system during a targeted attack reveals more about system security and response time to handle incidents than wide spectrum attack. By carefully choosing valuable targets, a Penetration Tester can determine the entire security infrastructure and associated risk for a valuable asset.
This is a common misinterpretation and should be clearly explained to all potential customers. Penetration Testing evaluates the effectiveness of existing security. If a customer does not have strong security then they will receive little value from Penetration Testing services. As a consultant, it is recommended that Penetration Testing services are offered as a means to verify security for existing systems once a customer believes they have exhausted all efforts to secure those systems and are ready to evaluate if there are any existing gaps in securing those systems.
Positioning a proper scope of work is critical when selling Penetration Testing services. The scope of work defines what systems and applications are being targeted as well as what toolsets may be used to compromise vulnerabilities that are found. Best practice is working with your customer during a design session to develop an acceptable scope of work that doesn't impact the value of the results.
Web Penetration Testing with Kali Linux—the next generation of BackTrack—is a hands-on guide that will provide you step-by-step methods for finding vulnerabilities and exploiting web applications. This book will cover researching targets, identifying and exploiting vulnerabilities in web applications as well as clients using web application services, defending web applications against common attacks, and building Penetration Testing deliverables for professional services practice. We believe this book is great for anyone who is interested in learning how to become a Penetration Tester, users who are new to Kali Linux and want to learn the features and differences in Kali versus BackTrack, and seasoned Penetration Testers who may need a refresher or reference on new tools and techniques.
This chapter will break down the fundamental concepts behind various security services as well as guidelines for building a professional Penetration Testing practice. Concepts include differentiating a Penetration Test from other services, methodology overview, and targeting web applications. This chapter also provides a brief overview of setting up a Kali Linux testing or real environment.