Understanding and Protecting Against API5: Broken Function Level Authorization

APIs require robust authorization controls to protect sensitive data and critical functions, and failures in these controls can lead to vulnerabilities such as Broken Function Level Authorization (BFLA). BFLA occurs when an API does not properly enforce function-level access restrictions, allowing users to perform unauthorized actions, which can lead to data breaches or unauthorized access to sensitive functions. Understanding the nuances between BFLA and similar vulnerabilities like Broken Object Level Authorization (BOLA) is crucial for effective API security. BFLA typically arises from inadequate authorization checks, over-reliance on predictable identifiers, and insufficient attention to security during development. To mitigate these risks, strategies such as rigorous authorization checks, input validation, and the principle of least privilege are recommended. StackHawk offers a modern Dynamic Application Security Testing (DAST) solution that helps developers detect BFLA vulnerabilities by integrating security testing into the development workflow, thus enabling early identification and remediation. By providing actionable insights and fostering secure coding practices, StackHawk empowers developers to proactively address API security challenges, including those outlined in the OWASP API Security Top Ten.