API Security: A Layered Approach to Protecting Critical Interfaces

APIs (Application Programming Interfaces) are the engine that powers mobile applications, partner integrations, cloud microservices, SaaS platforms, and artificial intelligence services. According to Imperva's State of API Security report, API traffic now represents over 71% of all web traffic. With the explosion in the number and importance of APIs, the challenge of protecting them has become increasingly complex.

When organizations look for API security solutions, they are faced with a confusing variety of tools, each of which protects APIs only in a limited and specific way. Among these tools are:

  • Secure code analyzers (SAST)
  • Dependency scanners (SCA)
  • CI/CD test platforms
  • Network firewalls
  • Web Application Firewalls (WAF)
  • API Gateways
  • Identity and Access Management (IAM) systems
  • Bot management platforms
  • API security dedicated solutions

None of these tools alone is sufficient to guarantee complete protection. API security is not a single product, but an architectural discipline that embraces the entire API lifecycle, from design to code, from deployment to runtime and monitoring.

The API Risk Landscape

API risks do not come from a single source, but emerge at every stage of the software lifecycle. There are seven main risk domains that are essential to understand:

  • Design and specifications
  • Code level
  • Third parties and supply chain
  • Deployment and configuration
  • Authentication and access
  • Automation and abuse
  • Business logic and behavioral risks

Real breaches almost always occur when risks from multiple domains align simultaneously. For example, a valid token (authentication risk) combined with an insecure direct object reference (business logic risk) can lead to a Broken Object Level Authorization (BOLA) attack.

Building a Layered Security Strategy

To effectively protect APIs, organizations must adopt a layered approach, combining multiple tools to cover the entire spectrum of risks. Here are some key steps:

  • Identify Risks: Analyze APIs to identify potential weak points and the most critical risk domains.
  • Select Appropriate Tools: Choose a combination of tools that covers all relevant risk domains.
  • Implement Continuous Monitoring: Use Runtime API Security solutions to monitor APIs in real-time and detect emerging threats.
  • Automate Responses: Configure systems to automatically respond to detected threats, reducing response time and minimizing potential impact.
  • Update and Maintain: Keep all security tools up-to-date and continuously monitor new threats and vulnerabilities.

Adopting a layered approach to API security not only protects critical interfaces but also helps ensure operational continuity and user trust. As the complexity and importance of APIs increase, a robust security strategy is more essential than ever.

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Building a Layered Security Strategy for APIs

API security is not solved with a single product but requires a layered approach that covers all possible risks. Here's how to proceed: 1. Map Current Risks Use the matrix provided to assess which tools you already have and which risks remain uncovered, especially those related to business logic (such as BOLA or IDOR attacks), often overlooked. 2. Integrate Specialized Solutions To fill the gaps, choose complementary tools: - Runtime API Security for real-time monitoring and detection of behavioral anomalies. - Bot Management to block automated abuse. - WAF to filter known attack patterns. - API Gateway and IAM to manage authentication and usage limits. 3. Automate the Response Configure automatic alerts and immediate blocks for detected threats, reducing reaction time. 4. Keep Updating Threats evolve rapidly: regularly update tools and monitor emerging vulnerabilities.

Why Runtime API Security is Essential

This tool excels in three key areas:
  • Discovery of Shadow/Undocumented APIs: Detects unmanaged endpoints that could become weak points.
  • Behavioral Analysis: Identifies slow, targeted attacks (e.g., object manipulation) that other tools ignore.
  • Collaboration with Other Tools: Works synergistically with WAF and Bot Management for a completed defense.

    • Practical Example with Imperva

    Solutions like Imperva API Security (by Thales) offer an integrated approach, combining:
  • WAF for known attacks.
  • API Gateway for access control.

    • Next Steps

  • Evaluate your API inventory: Identify critical endpoints and potential vulnerabilities.
  • Conduct a gap analysis: Use the matrix to see which risks remain uncovered.
  • Contact experts: Request a customized assessment from providers like Imperva for a tailored strategy.
    • Organizations that treat API security as an architecture, not just a simple requirement, are the ones that can innovate quickly without compromising protection. Investing in complementary tools and continuous monitoring is the only way to address today's and future threats. --- Note: This text has been translated and synthesized from the original content, maintaining only the parts not already included in the first half of the summary.

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