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      API Security Management: Best Practices

      Julia Teryokhina, Senior Presales Engineering Manager

      June 10, 2024

      Have you ever wondered how information gets exchanged over the internet? The magic happens thanks to APIs – Application Programming Interfaces. APIs enable communication between your browser and the server-side of an application. They are like the glue holding the digital world together, making apps talk to each other seamlessly. But just like you wouldn’t leave your front door wide open, you shouldn’t leave your APIs unsecured. Imagine if hacking your internet banking was as easy as guessing a Wi-Fi password – scary, right? Unsecured APIs can lead to data leaks, breaches, and more headaches than forgetting your own Wi-Fi password. API security threats are real, and addressing them early is essential for maintaining a smooth and secure digital experience. In our article, you can find valuable insights on how to secure APIs.

      Why API security is important

      Modern software can be roughly divided into three main components: the client (or frontend), the server (or backend), and the database. In a well-designed system, the client doesn’t interact directly with the database but communicates with the server through an API. The server handles significant business logic, ensuring data completeness, accuracy, and integrity, often managing sensitive information.

      API security best practices

      Databases may store both confidential (personal) and public data, and depending on the implementation, this data can be encrypted or unencrypted. Importantly, the client side rarely holds sensitive data, containing at most the personal information of the current user. This makes the client side less attractive to hackers, as breaching a single client provides limited valuable information.

      Protecting the database is far more critical since hackers may attempt to steal the entire database. However, such attacks are increasingly challenging due to the need to bypass infrastructure security measures, particularly those implemented within a DevSecOps framework. 

      Typically, there is no direct access to the database to retrieve data via SQL queries. Therefore, hackers often focus their efforts on the server (or backend). The API is the most accessible point of attack because it is inherently a public interface for interacting with the server. An inadequately secured or improperly implemented API is essentially a red carpet for hackers. Ensuring robust API protection while developing on backend is crucial to prevent unauthorized access and potential data breaches.

      However, securing APIs is particularly difficult due to their dynamic nature and extensive integration. Key API security challenges include managing diverse endpoints, implementing robust authentication and authorization, dealing with external integrations that increase the attack surface, balancing rate limiting and throttling, and keeping pace with evolving threats like scraping and injection attacks.

      Meanwhile, API breaches can have significant consequences, and no one is completely immune to them. Over the years, major players like Facebook, GitHub, Twitter, Peloton, and Experian have been targeted by hackers. Among the most recent high-profile cases are the breaches of T-Mobile and Duolingo:

      1. T-Mobile has experienced eight major security breaches since 2018, with the latest incident in November 2022 exposing the personal data of about 37 million customers. The attackers accessed names, birthdates, billing addresses, phone numbers, and account details through a company API, likely exploiting an unpatched authorization vulnerability; although sensitive data like passwords and social security numbers were not leaked, the exposed information still poses significant risks for phishing and identity fraud.
      2. In January 2023, data from 2.6 million Duolingo users, including email addresses and usernames, was scraped from the company’s API and appeared on a dark web forum. The API vulnerability, due to inadequate authentication and authorization, allowed access to user information without proper verification, leading to significant privacy risks and potential misuse for phishing and social engineering attacks.

      It’s important to note that  API breach statistics is often delayed, with system hacks taking up to six months to detect. Therefore, addressing API security threats requires a proactive, comprehensive approach to ensure data integrity and protection.

      API security best practices

      Securing API endpoints involves methods and technologies to protect the public interface from attacks, safeguard confidential data, ensure authorized access, and prevent data leaks, thus maintaining the integrity and reliability of applications.

      OWASP API Security Top 10 lists the most serious vulnerabilities and provides guidelines on how to prevent them. Here is a brief overview along with recommended solutions:

      OWASP ID

      API vulnerability (briefly)

      How to prevent


      Unauthorized access to user data

      - Implement robust access controls based on user policies and hierarchy, along with authentication mechanisms.
      - Use random and unpredictable values as GUIDs for record IDs.


      Weak authentication

      - Implement standardized practices for authentication, token generation, and password storage, incorporating robust security measures (re-authentication for sensitive operations and multi-factor authentication).
      - Employ anti-brute force mechanisms (rate limiting, account lockout, CAPTCHA).
      - Avoid using API keys for user authentication.


      Unauthorized changes to data

      - Ensure only authorized users access object properties via API endpoints, avoid generic methods like to_json() or to_string().
      - Limit automatic client input binding and restrict changes to only necessary object properties.
      - Implement schema-based response validation and maintain minimal data structures.


      Unlimited resource use

      - Implement rate limiting and throttling to prevent denial-of-service attacks and resource exhaustion.
      - Monitor resource usage to detect and mitigate abnormal patterns.


      Unauthorized function use

      - Implement consistent authorization across your application.
      - Review API endpoints for function-level authorization flaws, considering application logic and group hierarchy.
      - Ensure administrative controllers implement role-based authorization checks.


      Unprotected sensitive processes

      - Identify business vulnerabilities.
      - Slow down automated threats with device fingerprinting, human detection via CAPTCHA or biometrics, and blocking IP addresses from Tor exit nodes and known proxies.
      - Ensure to secure and limit access to APIs directly consumed by machines to safeguard vulnerable endpoints.


      Server manipulation

      - Validate and sanitize input data to prevent attackers from manipulating server-side requests via SQL injections, XSS, and command injection.
      - Implement server-side security controls to restrict outgoing requests to trusted destinations.


      Poor security settings

      Regularly audit and update security configurations to ensure that they align with industry best practices and security standards.


      Outdated API management

      - Implement robust API lifecycle management practices.
      - Track and manage API versions and endpoints effectively.
      - Retire outdated or insecure APIs promptly.


      Trusting unverified data

      - Validate and sanitize data from external APIs to prevent injection attacks and other security vulnerabilities.
      - Implement strict data validation and input sanitization practices.

      By implementing these best practices, you will address major API security vulnerabilities and protect yourself from data breaches and reputational damage.

      API security standards

      As digitization expands and systems become more interconnected, the importance of API governance and adherence to standards continues to rise for businesses. ISO/IEC 27001 sets the gold standard for information security in software development, offering a robust framework for organizations to establish and maintain effective information security management systems (ISMS). Additionally, it’s advisable to incorporate the following technologies:

      • OAuth 2.0 and OpenID Connect protocols recognized as API authentication best practices. They are used for secure authentication and authorization processes, ensuring trusted access to resources.
      • JSON Web Tokens (JWT) facilitate secure data transmission between parties.
      • Transport Layer Security (TLS) encrypts communication between clients and servers, safeguarding data integrity.
      • Cross-Origin Resource Sharing (CORS) mechanisms specify permitted origins for accessing resources, enhancing web application security.
      • Utilizing HTTP security headers like Content Security Policy (CSP) and X-Content-Type-Options helps mitigate various attack vectors.

      By properly integrating standards into the application architecture, you can ensure the protection of critical business functions.

      Securing the API lifecycle through testing and DevSecOps

      Creating a secure API lifecycle demands an integrated approach that addresses security concerns at every stage of development, from initial architectural design to final system deployment. Implementing a robust API security strategy, which involves meticulous assessment of all endpoints and the establishment of stringent security policies, serves as the foundation for ensuring data protection. However, it’s not sufficient to merely set up rules and adhere to API security best practices; it’s essential to validate that these measures function as intended. This necessitates integrating security testing during both the development and operational phases, with particular emphasis on the latter to handle real, potentially confidential data effectively.

      API security testing involves vulnerability assessment, penetration testing, authentication and authorization checks, data validation, encryption verification, session management evaluation, and error handling assessment. The tests can be conducted manually or through the use of security scan tools such as OWASP ZAP (Zed Attack Proxy), Burp Suite, Postman, SoapUI, and others. Automating security testing has its own advantages: such tests can be incorporated into CI/CD pipelines. Additionally, you can utilize specialized security frameworks ensuring Interactive Application Security Testing (IAST), such as Checkmarx, and Runtime Application Self-Protection (RASP), such as Fortify.

      Incorporating security testing during development and fortifying the infrastructure with various security tools and protocols is crucial for enhancing overall API security management. In addition to deploying the necessary environments, the DevSecOps approach integrates continuous logging and monitoring and enforces security policies from the outset of the development cycle through deployment and maintenance. These measures help identify and address potential API security vulnerabilities before they escalate into serious threats.

      Trends for securing APIs

      API security best practices

      The future of API security is marked by emerging trends and evolving strategies to combat increasingly sophisticated cyber threats. One notable trend is the adoption of AI and machine learning technologies to enhance application security. These technologies enable organizations to analyze vast amounts of data to detect and respond to security threats in real time, strengthening overall software safety.

      Another significant advancement is the rise of zero-trust security models in API development. Zero-trust architecture assumes that no entity, whether inside or outside the organization, should be trusted by default. Instead, access controls and security measures are applied rigorously, with authentication and authorization enforced at every step of the API interaction. This approach minimizes the risk of unauthorized access and data breaches, particularly in distributed and cloud-based environments.

      Additionally, the shift towards decentralized identity management and blockchain technology holds promise for enhancing API security. Decentralized identity solutions enable users to maintain control over their identity and personal data, reducing the reliance on centralized identity providers and minimizing the risk of identity theft and data breaches. Blockchain technology, with its immutable and transparent ledger, offers opportunities for secure and tamper-resistant API transactions, ensuring data integrity and authenticity.

      By adopting proactive measures and staying ahead of emerging trends in API security strategies, businesses can fortify their defenses against evolving cyber threats and protect their digital assets effectively.

      The bottom line

      Understanding the latest methodologies and technologies is crucial for knowing how to secure API effectively. However, staying abreast of recent advancements in software development, particularly in cybersecurity, can be challenging. Timspark professionals offer assistance at every stage of the development lifecycle, from architectural design to secure deployment. Together, we can create exceptional software solutions.

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