SAST vs DAST: Key Differences Between Static and Dynamic Application Security Testing
SAST vs DAST: What’s the Difference?
Nowadays, hackers often target software applications to attack companies and steal data. To protect themselves, companies use special tools that examine their code for any security issues. This helps them fix problems early before hackers can exploit them.The two main types of app testing are called SAST and DAST. SAST is short for "Static Application Security Testing." DAST stands for "Dynamic Application Security Testing."
While both SAST and DAST are important for app security, they actually check for problems in different ways. This article will explain what SAST and DAST do, what each one is good at, and when to use them.
What is SAST?
SAST analyzes application code without executing it. SAST tools scan source code, binaries, and libraries to find security vulnerabilities. They use techniques like data flow analysis and control flow analysis to understand how data moves through code.Benefits of SAST include:
- Scans code early in development so vulnerabilities get fixed faster
- Checks entire codebase for vulnerabilities
- Good for detecting common flaws like SQL injection, cross-site scripting, etc.
- Automated testing takes the burden off developers
Limitations of SAST:
- Only analyzes code it has access to
- Can generate false positives if certain test cases aren’t modeled properly
- Struggles with highly complex code flows
When Should You Use SAST?
Use SAST early on as code gets written to find and fix security bugs quickly. Integrate SAST tools into CI/CD pipelines for automatic scans. SAST works well for modern code languages with available analyzers like Java, C#, and JavaScript.What is DAST?
DAST tests applications from the outside by actually attacking the running app. DAST tools crawl sites to find all available content/functions, then launch exploits to analyze behavior and find potential vulnerabilities.Benefits of DAST:
- Tests the application in a running state which is how hackers would attack it
- Good for validating often-missed flaws like authentication issues, access control weaknesses, etc
- Helps prioritize patching known vulnerabilities being exploited in the wild
Limitations of DAST:
- Typically conducted later in development so bugs persist longer
- Won’t analyze areas of code it can’t reach by testing the UI/APIs
- Can be disruptive to test directly on production sites