Dynamic Application Security Testing (DAST) is a cybersecurity testing technique used to assess the security of web applications and services by analyzing them in their running state. DAST is also known as black-box testing because it focuses on the application’s external behavior, simulating how an attacker might interact with it. Here are the key characteristics and components of DAST:

External Testing:

  • DAST evaluates the application from the outside, just as a real attacker would. It interacts with the application through its exposed interfaces, such as HTTP(S) endpoints.

Runtime Analysis:

  • DAST tools analyze the application during runtime by sending various types of requests (HTTP requests, input parameters, etc.) and observing the responses.

Dynamic Scanning:

  • DAST tools perform dynamic scanning of the application to identify potential vulnerabilities and security weaknesses.
  • It does not require access to the application’s source code and can be applied to both internal and external-facing applications.

Common Vulnerabilities:

  • DAST tools typically focus on detecting common web application vulnerabilities, including SQL injection, Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), security misconfigurations, and more.

Automated Testing:

  • DAST tools automate the process of sending requests and analyzing responses, making it efficient for assessing large and complex web applications.

Authentication Testing:

  • DAST tools can assess how an application handles user authentication and authorization, including session management and access control.

Scalability:

  • DAST is suitable for testing both small and large web applications, and it can scale to accommodate complex and dynamic web environments.

False Positives:

  • DAST tools may generate false positives (identifying vulnerabilities that do not exist) or miss certain vulnerabilities, requiring human validation and interpretation.

Reporting and Remediation:

  • DAST tools generate reports that highlight identified vulnerabilities, their severity, and recommendations for remediation.

Regression Testing:

  • DAST can be used for ongoing regression testing to ensure that security vulnerabilities are not introduced when new code is added or changes are made to the application.

Integration:

  • DAST tools can integrate with Continuous Integration/Continuous Deployment (CI/CD) pipelines to automate security testing as part of the development process.

Challenges:

  • DAST may not uncover all vulnerabilities, especially those related to the application’s business logic, and it may not provide detailed insights into the root causes of vulnerabilities.

DAST is a valuable component of a comprehensive application security testing strategy. It complements other testing techniques like Static Application Security Testing (SAST) and Interactive Application Security Testing (IAST). Combining these methods helps organizations identify and address security vulnerabilities in different aspects of their applications, reducing the risk of security breaches and data leaks.