Understanding Attack Surface Management - the key to finding your security gaps

Written by Lead in BlackstoneOne, Jan Minche .

You may have heard the term "Attack Surface" and wondered why managing it is so crucial for cybersecurity. In this article, we’ll explore what Attack Surface Management (ASM) entails and how it helps organizations proactively detect vulnerabilities, address potential threats, and prevent them from evolving into costly data breaches.

A fundamental overview

In the ever-evolving world of cybersecurity, protecting your organization's digital assets goes far beyond locking the office door and installing firewalls or antivirus software. Therefore, Attack Surface Management (ASM) has become a core component of modern cybersecurity in businesses worldwide. It is acrucial solution for organizations of all sizes across all industries to detect every potential entry point or vulnerability that an attacker might exploit, whether it’s through a server, website, or cloud service.

What is the Attack Surface?

But what exactly is an "attack surface"? Think of it as every asset your organization has - known and unknown - that connects to your IT environment. As organizations grow and use more technology, their attack surface becomes larger, increasing the number of potential vulnerabilities that could be exploited by threats.

Imagine this; your organizations marketing team has created a campaign using a smart online tool they stumbled upon on the internet. The online campaign tool only requires the provision of contact details and customer data to begin offering support and creating a subdomain linked to you and your domain(s).

Frequently, data is integrated into these platforms for campaign purposes or other activities, often without a detailed review of its source or associated security implications. The scenario mentioned above is not just a hypothetical example; it is a real-world situation. Many companies face similar challenges when for instance development, production, legal marketing, HR or Sales departments set up subdomains using services and unfamiliar online tools which expands the attack surface.

What is the difference between Internal and External Attack Surface Management?

External and internal Attack Surface Management is categorized under the umbrella of ASM, focusing on specific types of assets and their related attack surfaces. EASM address attack surfaces in a network environment, providing continuous discovery and assessment of any internet-facing asset, such as public web servers, APIs, SSL certificates, and cloud services. The solution track changes in your attack surface – like new assets showing up, new vulnerabilities identified - this to deliver real-time insights into vast and dynamic surfaces. IASM on the other hand focuses on managing risks within an organization’s internal network. Issues addressed with IASM solutions includes unauthorized access, privilege misappropriation, and service disruptions.

The importance of a strong ASM solution Traditional security measures often focus on protecting known assets. But what about the unknown or unmanaged assets, sometimes referred to as "shadow IT"? These can include forgotten servers, outdated software, or third-party systems that connect to your network but aren't actively monitored. Attack Surface Management identifies and maps all these assets, providing a complete view of the organization's digital footprint.

By using ASM tools, companies can:

1. Discover hidden risks: Find all assets, including those not officially tracked by IT.
2. Assess vulnerabilities: Determine which assets are most vulnerable to attack.
3. Prioritize action: Focus on high-risk areas first to prevent breaches.
4. Continuously monitor: As the attack surface evolves, ASM ensures no new vulnerabilities are left unchecked.

How to use ASM?

Attack Surface Management operates on a continuous cycle of discovery, assessment, and action. It begins with identifying every asset connected to your network, whether it's physical, virtual, or in the cloud. From there, each asset is analysed for potential vulnerabilities. Finally, organizations can take targeted action to strengthen security where it's needed most, reducing their overall risk.

A future-proof approach to cyber security

The digital landscape is constantly changing, and so is your attack surface. Whether you're a growing business or a large enterprise, having a complete understanding of your potential vulnerabilities is essential for staying ahead of cyber threats. Attack Surface Management isn’t just a tool; it's a critical part of a modern, proactive security strategy that gives you control and peace of mind in a complex, interconnected world.