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api-grpc

gRPC API exploitation — reflection-based discovery via grpcurl, protobuf fuzzing, missing authz on streaming RPCs, gRPC-Web → backend SSRF, mTLS bypass, metadata header injection, h2c smuggling against gRPC fronts.

packages/decepticon/decepticon/skills/standard/exploit/api/grpc/SKILL.md

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Nov 7, 2026
License
Apache-2.0

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# gRPC API Attack Surface

## Discovery

```bash
# 1. Detect: HTTP/2 + content-type application/grpc[+proto|+json]
curl -s -I --http2 https://api.target/svc/method | grep -iE 'content-type|alt-svc'

# 2. List services via server reflection (often left on in prod)
grpcurl -plaintext target:50051 list
grpcurl -plaintext target:50051 list mypackage.MyService
grpcurl -plaintext target:50051 describe mypackage.MyService.Method

# 3. If reflection disabled, grab .proto from: