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SAST vs DAST

SAST vs DAST

If you come across what is SAST and DAST. Than probably you are looking for application source code review. we will know what exactly SAST and DAST is and What’s the best approach for application security testing?

The differences between SAST and DAST include where they run in the development cycle and what kinds of vulnerabilities they find. Learn why you need both. Recent high-profile data breaches have made organizations more concerned about the financial and business consequences of having their data stolen. They know they need to identify vulnerabilities in their applications and mitigate the risks. So they’re adding application security testing, including SAST and DAST, to their software development workflows. 

What are SAST and DAST?

SAST and DAST are application security testing methodologies used to find security vulnerabilities that can make an application susceptible to attack. Static application security testing (SAST) is a white box method of testing. It examines the code to find software flaws and weaknesses such as SQL injection and others listed in the OWASP Top 10. Dynamic application security testing (DAST) is a black box testing method that examines an application as it’s running to find vulnerabilities that an attacker could exploit.

SAST vs DAST

What’s the difference between SAST and DAST?
Many organizations wonder about the pros and cons of choosing SAST vs. DAST. But SAST and DAST are different testing approaches with different benefits. They find different types of vulnerabilities, and they’re most effective in different phases of the software development life cycle. SAST should be performed early and often against all files containing source code. DAST should be performed on a running application in an environment similar to production. So the best approach is to include both SAST and DAST in your application security testing program. 

SAST VS DAST

SAST DAST
White box security testing The tester has access to the underlying framework, design, and implementation. The application is tested from the inside out. This type of testing represents the developer approach. Black box security testing The tester has no knowledge of the technologies or frameworks that the application is built on. The application is tested from the outside in. This type of testing represents the hacker approach.
Requires source code SAST doesn’t require a deployed application. It analyzes the sources code or binary without executing the application. Requires a running application DAST doesn’t require source code or binaries. It analyzes by executing the application.
Finds vulnerabilities earlier in the SDLC The scan can be executed as soon as code is deemed feature-complete. Finds vulnerabilities toward the end of the SDLC Vulnerabilities can be discovered after the development cycle is complete.
Less expensive to fix vulnerabilities Since vulnerabilities are found earlier in the SDLC, it’s easier and faster to remediate them. Findings can often be fixed before the code enters the QA cycle. More expensive to fix vulnerabilities Since vulnerabilities are found toward the end of the SDLC, remediation often gets pushed into the next cycle. Critical vulnerabilities may be fixed as an emergency release.
Can’t discover run-time and environment-related issues Since the tool scans static code, it can’t discover run-time vulnerabilities. Can discover run-time and environment-related issues Since the tool uses dynamic analysis on an application, it is able to find run-time vulnerabilities.
Typically supports all kinds of software Examples include web applications, web services, and thick clients. Typically scans only apps like web applications and web services DAST is not useful for other types of software.

Start security testing by shifting left. 

Many studies have shown that it’s faster, easier, and cheaper to find and fix software issues early in the development process, as developers write code, rather than later (e.g., in testing, QA, or production). Organizations often use application security tools, such as static application security testing (SAST) tools, early in development to find and fix both quality issues and security vulnerabilities. Teams often use SAST tools in conjunction with software composition analysis (SCA) tools, which find security vulnerabilities and license issues in open source components.

Static versus dynamic testing
Many organizations use dynamic application security testing (DAST) or penetration testing during QA or just before production. DAST and pen testing dynamically test an application for security vulnerabilities that can’t be detected using SAST or SCA tools. Security teams often perform DAST and pen testing periodically on live released applications for security compliance reasons. But running dynamic testing on live applications exposes them to cyber-attacks and potential data breaches.
Also, while DAST and pen testing can identify security vulnerabilities, they can’t identify the corresponding lines of code containing the vulnerability—something that SAST tools can do before an application is in production to reduce the attack surface for a potential vulnerability. As a result, critical security issues identified by DAST can be problematic to fix and can take a long time to resolve. With companies now deploying to production multiple times a day (e.g., Netflix), a live security vulnerability lurking in production code can spell disaster, affecting the bottom line instantly. This potential for far-reaching, immediate impact from a single vulnerability is why SAST sees more widespread adoption than DAST.

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