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HIGH7.1

GHSA-j777-63hf-hx76

Envoy Admin Interface Exposed through prometheus metrics endpoint

Quick fix

GHSA-j777-63hf-hx76 — github.com/envoyproxy/gateway: upgrade to the fixed version with the command below.

go get github.com/envoyproxy/gateway@v1.2.6

Details

### Impact A user with access to a Kubernetes cluster where Envoy Gateway is installed can use a path traversal attack to execute Envoy Admin interface commands on proxies managed by Envoy Gateway. The admin interface can be used to terminate the Envoy process and extract the Envoy configuration (possibly containing confidential data).

For example, the following command, if run from within the Kubernetes cluster, can be used to get the configuration dump of the proxy: ``` curl --path-as-is http://<Proxy-Service-ClusterIP>:19001/stats/prometheus/../../config_dump ``` ### Patches 1.2.6

### Workarounds The `EnvoyProxy` API can be used to apply a bootstrap config patch that restricts access strictly to the prometheus stats endpoint. Find below an example of such a bootstrap patch.

``` apiVersion: gateway.envoyproxy.io/v1alpha1 kind: EnvoyProxy metadata: name: custom-proxy-config namespace: default spec: bootstrap: type: JSONPatch jsonPatches: - op: "add" path: "/static_resources/listeners/0/filter_chains/0/filters/0/typed_config/normalize_path" value: true - op: "replace" path: "/static_resources/listeners/0/filter_chains/0/filters/0/typed_config/route_config/virtual_hosts/0/routes/0/match" value: path: "/stats/prometheus" headers: - name: ":method" exact_match: GET ```

### References - Envoy Admin Interface: https://www.envoyproxy.io/docs/envoy/latest/operations/admin - Envoy Configuration Best Practices: https://www.envoyproxy.io/docs/envoy/latest/configuration/best_practices/edge

Are you affected?

Enter the version of the package you're using.

Affected packages

Go/github.com/envoyproxy/gateway
Introduced in: 0Fixed in: 1.2.6
Fixgo get github.com/envoyproxy/gateway@v1.2.6

References