Description
Skipper is an HTTP router and reverse proxy for service composition. Prior to version 0.24.0, when running Skipper as an Ingress controller, users with permissions to create an Ingress and a Service of type ExternalName can create routes that enable them to use Skipper's network access to reach internal services. Version 0.24.0 disables Kubernetes ExternalName by default. As a workaround, developers can allow list targets of an ExternalName and allow list via regular expressions.
Problem types
CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
CWE-918: Server-Side Request Forgery (SSRF)
Product status
References
github.com/...kipper/security/advisories/GHSA-mxxc-p822-2hx9
github.com/...ommit/a4c87ce029a58eb8e1c2c1f93049194a39cf6219
kubernetes.io/docs/concepts/services-networking/service/