The boundary between websites, web applications, web services, APIs, and mobile applications is becoming increasingly blurred. Web technologies have become the default choice for software development, with frontends communicating with backends via APIs in complex distributed architectures and deployment models. As the lines between different types of applications blur, it becomes crucial to have reliable tools and methods for testing security vulnerabilities across the entire application ecosystem.
Addressing the challenge of testing everything running on various platforms requires the use of dynamic application security testing (DAST), commonly known as vulnerability scanning in its automated form. Modern DAST tools go beyond testing web pages for XSS vulnerabilities, offering a comprehensive approach to probing the external attack surfaces of web applications to provide a realistic view of the security posture when integrated into AppSec programs.
What is DAST used for?
DAST solutions are primarily used for automatically testing application vulnerabilities from an external perspective. These tools have evolved from simple scripts used for aiding manual penetration testing to full-featured AppSec platforms that enable organizations to seamlessly integrate security testing into their development and operations. DAST is versatile, covering a range of use cases in InfoSec and AppSec, including website vulnerability scanning, API security testing, security testing in the SDLC, automated penetration testing, vulnerability assessment, and regulatory compliance.
When is DAST an appropriate solution?
For organizations that run and develop web applications, some form of application security testing is essential. DAST stands out as a usable, useful, and scalable solution regardless of the technology stack, source code availability, or deployment model. By making DAST a core component of the AppSec program, organizations can establish continuous vulnerability testing processes, address security gaps early in the development lifecycle, and optimize pen testing and bounty programs by internally handling identified vulnerabilities.
Does DAST require a running application?
Dynamic testing is conducted on a running application or system by using DAST tools. However, with modern containerized components and application frameworks, having a runnable app at various stages of development and testing is common. By incorporating DAST into multiple stages of the development pipeline, organizations can start security testing early and extend coverage as they approach production.
Can DAST be used for more than just web applications?
DAST can and should be utilized to test any software built with web technologies, including complex applications with multiple components. With enterprise-grade DAST solutions, organizations can test all parts of their application environment, including APIs, web services, and backend databases.
Using DAST for API security testing
API security testing, which involves testing APIs for vulnerabilities, is an essential use case for DAST tools. With advanced DAST platforms, organizations can conduct comprehensive API security testing and discover APIs within the same platform.
Testing for server misconfigurations
In addition to probing for application-specific vulnerabilities, DAST tools can assess server misconfigurations by analyzing server responses and security headers to identify potential security issues.
Finding database misconfigurations
DAST tools can identify database-related vulnerabilities, such as SQL injection, and detect insecure database server configurations that could lead to serious breaches. Advanced DAST security checks can reveal injection points and expose the consequences of insecure setups.
Scanning mobile application backends
Although DAST does not directly scan mobile applications, it can test the security of mobile app backends and services by scanning the APIs used for communication.
Bottom line: Application security is far more than scanning web pages
Application security requires comprehensive testing and monitoring, especially as critical business systems move to the cloud. DAST is a practical approach that provides broad coverage and visibility, making it a vital component of a robust application security program. Platforms like Invicti offer advanced vulnerability scanning engines, application and API discovery, software composition analysis, vulnerability management, and workflow integrations to streamline application security testing.
