Here’s a clear comparison of SAST, DAST, and SCA — the three core application security testing types in DevSecOps:
🔐 SAST (Static Application Security Testing)
| Feature | Details |
|---|---|
| 🔍 What it is | Analyzes source code or bytecode for vulnerabilities without executing it |
| 🛠️ When it runs | Early in development (pre-build, pre-deploy) |
| 🔧 How it works | Scans code repositories, looks for known patterns and insecure coding practices |
| ⚠️ Finds issues like | SQL injection, XSS, hardcoded secrets, insecure functions |
| ✅ Pros | Early feedback, fast scans, language-aware, shift-left security |
| ❌ Cons | False positives, lacks runtime context |
| 🧰 Tools | GitLab SAST, SonarQube, Checkmarx, Fortify, CodeQL |
🌐 DAST (Dynamic Application Security Testing)
| Feature | Details |
|---|---|
| 🔍 What it is | Scans a running application by simulating external attacks |
| 🛠️ When it runs | After deployment (in staging or test environments) |
| 🔧 How it works | Sends requests to web endpoints and analyzes responses |
| ⚠️ Finds issues like | Broken auth, exposed APIs, missing headers, server misconfigurations |
| ✅ Pros | Real-world simulation, no source code needed |
| ❌ Cons | Slower, can miss hidden paths, needs test environment |
| 🧰 Tools | GitLab DAST, OWASP ZAP, Burp Suite, AppSpider |
📦 SCA (Software Composition Analysis)
| Feature | Details |
|---|---|
| 🔍 What it is | Analyzes open-source libraries and dependencies for known vulnerabilities |
| 🛠️ When it runs | During dependency resolution or in CI pipelines |
| 🔧 How it works | Checks versions in package.json, pom.xml, etc., against CVE databases |
| ⚠️ Finds issues like | Known CVEs in open-source packages, license risks |
| ✅ Pros | Easy to integrate, real CVE data, license checks |
| ❌ Cons | Doesn’t scan your code, only 3rd-party dependencies |
| 🧰 Tools | GitLab Dependency Scanning, Snyk, WhiteSource, OWASP Dependency-Check |
🧠 TL;DR — Summary
| Metric | SAST | DAST | SCA |
|---|---|---|---|
| Code access | Required (source/static) | Not required | Required (dependencies only) |
| App state | Source code | Running app | Dependency list |
| Vulnerability | Code-level bugs | Runtime/web issues | Open-source CVEs |
| Best time | Early in CI | After deployment | Any time in CI |
| GitLab Tool | GitLab SAST | GitLab DAST | GitLab Dependency Scanning |
I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.
I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.
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