NATS Banner Indicates No Authentication
nats-unauthenticated-banner is a medium severity check in the
messaging category, written in yaml.
Its source is templates/messaging/nats/nats-unauthenticated-banner.yaml in
cert-x-gen-templates.
What it checks
Section titled “What it checks”Detects NATS servers that advertise auth_required=false in the INFO banner. This indicates the broker allows unauthenticated connections, which can enable message snooping or injection.
Header
Section titled “Header”| Field | Value |
|---|---|
| Id | nats-unauthenticated-banner |
| Severity | medium |
| Language | yaml |
| Category | messaging |
| Author | CERT-X-GEN Security Team |
| Template version | 1.0.0 |
| Confidence | 80 |
| CVSS | 5.3 |
| Weakness | CWE-306 |
| Tags | nats, jetstream, messaging, unauthenticated, exposure |
| Target kind | not recorded |
| Oracle | not recorded |
The file declares network, remediation as well. Those are not tabled above; read the
source for what they carry.
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://docs.nats.io/running-a-nats-service/configuration
- https://cwe.mitre.org/data/definitions/306.html
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 nats-unauthenticated-bannerThe 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.
- messaging 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.