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APPLICATION SECURITY TESTING (AST)

Dynamic Application Security Testing (DAST)​

Dynamic Application Security Testing (DAST) is a crucial component of modern application security, designed to identify vulnerabilities in web applications during runtime.
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  • What is DAST?​
Dynamic Application Security Testing (DAST) is a testing methodology that analyzes web applications in their running state to identify vulnerabilities and security weaknesses. Unlike Static Application Security Testing (SAST), which examines source code, DAST interacts with the application as an external attacker would, providing a practical and realistic assessment of its security posture. This approach allows DAST to detect issues such as SQL injection, cross-site scripting (XSS), and other runtime vulnerabilities that may not be evident from static code analysis.

  • How DAST Works?​
DAST operates by sending automated, simulated attacks to the running application, mimicking the behavior of potential attackers. It does not require access to the source code; instead, it tests the application from the outside-in, analyzing the responses and behaviors to identify potential security flaws. Key steps in how DAST works include:

Crawling the Application

DAST begins by mapping out the application’s structure, discovering pages, forms, and inputs that could be potential entry points for attacks.

Simulating
Attacks

The tool then launches a series of pre-defined attack patterns against these identified entry points, such as injecting malicious code or manipulating inputs, to see how the application responds.

Analyzing Responses

Based on the application’s responses, DAST identifies vulnerabilities like input validation errors, authentication weaknesses, and improper error handling.

Reporting Findings

After testing, DAST generates a comprehensive report detailing the vulnerabilities discovered, their severity, and recommendations for remediation.

  • Use Case​

DAST is particularly valuable for organizations that need to ensure the security of their web applications in a production-like environment. One common use case is during the late stages of the development lifecycle, where the application is deployed in a staging environment that closely mirrors the production setup. 

By performing DAST at this stage, teams can identify and address vulnerabilities before the application goes live, reducing the risk of security breaches. Additionally, DAST is also used in continuous integration/continuous deployment (CI/CD) pipelines to provide ongoing security assessments as new features and updates are deployed.

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