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SAST and DAST are useful application-security controls, but neither is a complete way to protect secrets. SAST analyzes source code, while DAST tests a running application. Secrets need a separate layer of detection—and operational controls for storing, accessing, protecting, logging, and rotating credentials.
What SAST and DAST examine
SAST analyzes source code
Static application security testing examines code or a repository for security issues. GitLab describes SAST as repository scanning, making it useful for finding certain vulnerabilities before an application runs. Its target is the code, not every place a credential might be exposed or used.
DAST tests a running application
Dynamic application security testing examines an application’s behavior while it is running. GitLab notes that DAST requires a deployable application. It tests a different target from SAST; neither method should be treated as a substitute for the other or as a complete secrets-management program. GitLab explains these scanning categories.
Why secrets require a distinct detection layer
A credential accidentally placed in a repository is a different kind of finding from a code vulnerability or a weakness observed through a running application. GitLab lists secret detection as a separate capability alongside SAST and DAST, describing it as a way to detect and block secrets from being committed. That separation matters: a team should not assume that code analysis or runtime testing will identify every exposed token, key, or password.
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Dedicated secret-scanning tools look for credentials they recognize in supported contexts. Their coverage is conditional, not universal. GitHub documents that detection can depend on token types, pattern pairs, and push-protection settings. For some pattern pairs, both parts must be found in the same file and pushed for the combination to be detected. Check the platform’s documented coverage for the credentials and workflows your organization uses; do not interpret a clean scan as proof that no secret exists. GitHub’s detection-scope documentation describes these conditions and limitations.
Detection is not the same as managing a credential
A scanner can flag a recognized credential, and some protections can stop recognized secrets from being committed. Neither function, by itself, governs where credentials are stored, who or what may use them, how CI/CD jobs handle them, or when they must be rotated. OWASP’s Secrets Management Cheat Sheet addresses those lifecycle responsibilities, including storage, access, CI/CD, logging, and rotation.
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OWASP points to cloud-provider and third-party secrets-management systems as possible ways to store and control secrets. The appropriate choice depends on your environment and access model. Whichever approach you use, keep credentials out of source code, grant access only to the people and processes that need it, protect pipeline execution and output, log relevant access, and have a rotation plan.
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How the controls fit together
| Control | Primary target | What it contributes | What it does not replace |
|---|---|---|---|
| SAST | Source code or repository | Analyzes code for security issues. | Dedicated secret detection or credential lifecycle management. |
| DAST | A running, deployable application | Tests application behavior. | Repository scanning or credential lifecycle management. |
| Secret detection | Supported credentials in repositories and configured contexts | Can alert on recognized secrets; some features can block recognized secrets from being committed. | Detection of every secret, every exposure path, or management of credentials after exposure. |
| Secrets management | Credential storage, access, use, logging, and rotation | Controls how credentials are handled throughout their lifecycle. | Code-vulnerability analysis or application behavior testing. |
GitLab’s documentation presents SAST, DAST, and secret detection as distinct scan types, including in its scan execution policy guidance. GitHub likewise distinguishes secret-scanning alerts from push protection: alerts report detected leaks, while push protection can prevent some recognized secrets from being committed. Coverage and limitations depend on supported patterns and configuration. GitHub documents secret scanning and its push-protection limitations.
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What to do when a secret is exposed
Treat an exposed credential as an incident to resolve, not merely as a scanner finding. A detection tool can identify a possible leak, but scanning alone does not revoke or replace the credential. OWASP’s lifecycle guidance makes access control and rotation part of secrets management, so response should address the credential itself as well as the code location where it appeared.
- Use the appropriate secret-detection alert or repository history to identify the exposed credential and where it appeared.
- Restrict or revoke the exposed credential, then replace it through the organization’s approved secrets-management process.
- Review relevant access and pipeline activity, and address the storage or workflow issue that allowed the exposure.
- Use secret scanning and, where supported, push protection to help catch future occurrences, while verifying coverage for the credential types in use.
A practical layered approach
- Use SAST for code. Run source-code analysis to identify security issues in repositories.
- Use DAST for running applications. Test a deployable application’s behavior, recognizing that this examines a different target from source code.
- Add dedicated secret detection. Enable repository scanning for supported credential types and review the platform’s documented patterns, pair requirements, and configuration.
- Consider blocking at commit time. Where available, evaluate push protection for recognized secrets and understand its documented limits before relying on it.
- Manage credentials throughout their lifecycle. Store secrets outside source code, limit access, protect CI/CD use and output, log relevant access, and plan rotation.
- Respond to findings operationally. Investigate exposure, revoke or replace the credential as appropriate, and correct the process that exposed it.
These controls are complementary, not competing scanner choices. Official documentation establishes their different functions, but it does not provide an independent accuracy benchmark for ranking products. Evaluate tools against the credential types, repositories, pipelines, and access practices you actually need to protect.
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- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
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