Vulnerability · Published Aug 5, 2020 · Assigned by GitHub_M
CVE-2020-15127Denial of service in Contour
High 7.5
In plain English
A high-severity missing authentication in contour from projectcontour. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities).
Official description
In Contour ( Ingress controller for Kubernetes) before version 1.7.0, a bad actor can shut down all instances of Envoy, essentially killing the entire ingress data plane. GET requests to /shutdown on port 8090 of the Envoy pod initiate Envoy's shutdown procedure. The shutdown procedure includes flipping the readiness endpoint to false, which removes Envoy from the routing pool. When running Envoy (For example on the host network, pod spec hostNetwork=true), the shutdown manager's endpoint is accessible to anyone on the network that can reach the Kubernetes node that's running Envoy. There is no authentication in place that prevents a rogue actor on the network from shutting down Envoy via the shutdown manager endpoint. Successful exploitation of this issue will lead to bad actors shutting down all instances of Envoy, essentially killing the entire ingress data plane. This is fixed in version 1.7.0.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| projectcontour | contour | < 1.7.0 |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/projectcontour/contour/security/advisories/GHSA-mjp8-x484-pm3r x_refsource_CONFIRM
- https://github.com/projectcontour/contour/releases/tag/v1.7.0 x_refsource_MISC