Cybersecurity’s dynamic duo: Vulnerability scanning and penetration testing

In today’s ever-evolving threat landscape, managed services providers (MSPs) and IT consultants are on the front lines, helping clients navigate the complexities of cybersecurity. Two fundamental tools in this arsenal are vulnerability scanning and penetration testing. However, confusion often surrounds these terms, leading to misinterpretations and potentially inadequate security measures. To clarify, we turned to two seasoned experts and ASCII Group members Angel Rojas Jr., president and CEO of DataCorps Technology Solutions, and Felicia King, CTO/CISO of QPC Security. This article, the first in a two-part series, focuses on the core differences, implementation strategies, and essential considerations for MSPs looking to provide robust security solutions. 

The key differences between vulnerability scanning and penetration testing

Both Rojas and King emphasize the distinct roles of vulnerability scanning and penetration testing. Vulnerability scanning, as King points out, “can be agent-based or credentialed, which provides a great deal more visibility into the status of systems. Vulnerability scans provide directly actionable data which can be prioritized using industry standards such as common vulnerabilities and exposures (CVE) severity, age of vulnerability, or exploit prediction scoring system (EPSS).” Rojas adds, “Vulnerability scanning is an automated process designed to detect known vulnerabilities, misconfigurations, and missing patches within an environment by identifying markers linked to publicly known vulnerabilities.”

Penetration testing, according to King, “can be used to identify weaknesses in an organization that vulnerability scanning would not reveal.” Rojas highlights that it goes beyond detection “by simulating real-world attacks to exploit vulnerabilities and uncover weaknesses – including unknown threats and configuration errors.” He further clarifies, “While vulnerability scanning establishes and maintains a security baseline, penetration testing validates that baseline and evaluates how that baseline could be bypassed or compromised through active exploitation.” Both experts agree that these processes are not interchangeable or mutually exclusive – they’re complementary. 

The maturity-based approach to achieving comprehensive coverage

King stresses that “vulnerability management overall is a progressive scale of operational maturity.” She says, “Organizations should always seek to fully utilize the tools they already have and master them before acquiring more tools. An organization doing a poor patch management job should not acquire separate vulnerability scanning or penetration testing tools or services as the fundamentals aren’t being properly handled.”

Rojas supports this, emphasizing, “Comprehensive coverage requires both processes: vulnerability scanning for routine detection and baseline maintenance, and periodic penetration testing to discover and validate complex vulnerabilities.”

King highlights the importance of a “comprehensive and accurate inventory” with “multi-point visibility.” She states, “The very first thing an organization must do to have a hope of being successful at vulnerability management is to have a comprehensive and accurate inventory.” She also emphasizes mastering patch management: “Once patch management is systematically proven to be competently handled every month, an organization can mature to a vulnerability scanning tool.”

Scaling for complex environments: Competent management is key

Both experts agree that competent management is crucial for scaling vulnerability management. King emphasizes, “Highly competent management will make or break vulnerability management; tools will not. All the systems scale without issue, limited only by the competency of the humans which manage the systems.”

Rojas concurs, adding, “Scalable vulnerability and penetration testing require robust tools specific for each task with appropriate network access to make detection possible, distributed scanning engines, and integration with asset discovery tools to identify systems dynamically.” 

Going beyond known CVEs

King clarifies, “It’s important to know that ‘vulnerabilities’ are generally defined as missing patches or known, documented vulnerabilities for which a CVE number has been assigned. Many unknown and unassigned vulnerabilities also exist. Only secure configuration management can prevent unknown vulnerabilities from being exploited.” Rojas adds, “Penetration testing tools explore unknown weaknesses, such as logical flaws, improper access controls, misconfigured systems, and vulnerabilities introduced by human errors or overlooked processes.”

King recommends having “multiple systems which can provide a point of view” for IT security management. She explains, “Modern zero-trust endpoint protection software includes patch management. Compliance agents exist, which can provide another point of view and visibility. Dedicated vulnerability assessment agents will be separate.” Rojas highlights the importance of broader integration: “The tools typically integrate with security information and event management (SIEM) systems, endpoint detection and response (EDR) platforms, and ticketing or change management systems.”

The value of a layered approach

For MSPs, adopting a layered approach to cybersecurity is key, leveraging both vulnerability scanning and penetration testing. Start with the fundamentals: A solid asset inventory and robust patch management. Then, layer in vulnerability scanning for continuous monitoring and penetration testing for deeper assessments when necessary. Emphasize the importance of competent management and seamless integration with existing security infrastructure. By providing a comprehensive and practical approach, MSPs can build trust and deliver effective cybersecurity solutions.

Stay tuned for Part 2, where we will explore operational aspects, reporting, continuous monitoring, training, monetization strategies, and real-world examples in greater depth.

About The ASCII Group, Inc.

Founded in 1984, The ASCII Group is the original IT community of the channel, uniting MSPs across North America. As a vendor-neutral organization, ASCII provides unbiased resources and a collaborative environment to support business growth. Members span the U.S. and Canada, ranging from SMB-focused MSPs to international solution providers. ASCII offers leveraged purchasing programs, education, marketing support, peer networking, and more, complemented by a vibrant ecosystem of technology vendors. Learn more at www.ascii.com.