gRPC Reflection API Exposure Detection
grpc-reflection-abuse is a high severity check in the
network category, written in go.
Its source is templates/network/grpc/grpc-reflection-abuse.go in
cert-x-gen-templates.
What it checks
Section titled “What it checks”Detects gRPC servers with reflection API enabled, exposing service definitions and methods
Header
Section titled “Header”| Field | Value |
|---|---|
| Id | grpc-reflection-abuse |
| Severity | high |
| Language | go |
| Category | network |
| Author | CERT-X-GEN Security Team |
| Template version | 1.0.0 |
| Confidence | 95 |
| CVSS | 5.3 |
| Weakness | CWE-200, CWE-538 |
| Tags | grpc, reflection, information-disclosure, service-enumeration |
| Target kind | not recorded |
| Oracle | not recorded |
References
Section titled “References”Declared in the header. cxg parses @references and then discards it, and
nothing at scan time reads it, so this is the only place the links a
template cites are surfaced.
- https://github.com/grpc/grpc/blob/master/doc/server-reflection.md
- https://grpc.io/docs/guides/reflection/
Run it
Section titled “Run it”To see what the copy on your machine says about itself, and to confirm it is installed at all:
cxg template info grpc-reflection-abuseThe id it prints is the one to pass anywhere a template is selected. See
cxg template for the rest of
the subcommand, Scan a target for running
a scan, and
A match is not a finding for how
to read what comes back.
Related
Section titled “Related”- Template catalog is the whole corpus.
- network is the rest of this category.
- Templates by weakness class groups checks by the defect they look for.
- Contribute a template is the route from a check you needed and could not find to a merged one.