42Crunch for Gin

Gin is a high-performance HTTP web framework for Go. Its minimal defaults and flexible middleware chain make it straightforward to build APIs, but security depends on deliberate configuration. API security for Gin centers on correct middleware ordering, precise route definitions, and validation of inputs and outputs. Without continuous assessment, misconfigured routes, loose CORS rules, and unchecked parameter expansions can expose sensitive data or enable unauthorized access.

The scanner is black-box and requires only a reachable endpoint. It sends read-only methods (GET and HEAD) and text-only POST probes to map routes and inspect security controls. For Gin APIs, it checks whether security middleware is present, whether routes accept unexpected methods, and whether error responses leak stack traces. OpenAPI 3.0, 3.1, and Swagger 2.0 specs are parsed with recursive $ref resolution and compared against runtime behavior to identify undefined security schemes or deprecated operations in your Gin service definitions.

Findings are mapped to PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023). The scanner detects issues common in Gin implementations, such as missing authentication on privileged routes, overly permissive CORS configurations, and unvalidated input leading to mass assignment or property authorization risks. It also flags verbose error messages that reveal internal paths or stack traces, which can complicate audit evidence collection and align with security controls described in compliance frameworks.

Authenticated scanning is available from the Starter tier onward. You can provide Bearer tokens, API keys, Basic credentials, or cookies. Before scanning with credentials, domain verification is required via DNS TXT record or an HTTP well-known file to ensure you are scanning the domain owner. Only specific headers are forwarded: Authorization, X-API-Key, Cookie, and X-Custom-* headers, ensuring that Gin middleware does not inadvertently process disallowed headers.

The scanner does not perform active SQL injection or command injection testing, as those require intrusive payloads outside its scope. It does not detect business logic vulnerabilities that require a human understanding of Gin handlers and domain rules, nor does it perform blind SSRF testing with out-of-band confirmation. For high-stakes audits, use this tool alongside manual review and professional penetration testing to validate controls and gather audit evidence.