I've been working with microservices that predominantly use gRPC instead of REST, and I'm searching for effective security testing tools that can truly understand gRPC rather than just treating it as general HTTP/2 traffic. My goal is to test gRPC endpoints in live environments and, ideally, automate the process. Unfortunately, most tools I've come across either don't support gRPC or are so cumbersome to configure that they aren't practical for large-scale use. I'm interested in hearing what tools others are using for runtime security testing of gRPC services. I'm open to both open source and commercial options, but I really need something that minimizes manual setup. Bonus points if it can integrate into CI/CD pipelines, but the main priority is that it interprets gRPC semantics effectively.
5 Answers
If you're running these services in Kubernetes, consider observing what's happening at runtime instead of just brute forcing endpoints. Using sidecars or eBPF for visibility can help catch unexpected calls and poorly formatted payloads that standard CI scans might miss. It's a different approach from classic testing, but it can uncover real issues pretty quickly.
Many DAST tools simply treat gRPC as plain HTTP/2, which often leads to missing critical issues. Look for a tool that understands gRPC messages and can fuzz them effectively. CheckMarx's DAST has a good reputation for this and integrates into CI without a lot of hassle, especially if you're also using SAST, since all findings get centralized.
While CI integration is helpful, the real advantage for gRPC testing comes from using tools that understand message schemas. Without that knowledge, automation won’t get you very far.
gRPC support across many security tools is still quite basic. From my experience, most teams opt to generate tests from proto files or lean on runtime monitoring instead of traditional scanners.
Anything that can't parse protobufs is really just taking a shot in the dark. Treating gRPC like standard HTTP/2 often ignores many genuine attack vectors.
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