CVE-2021-32783

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Summary

CVECVE-2021-32783
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-07-23 22:15:00 UTC
Updated2021-08-05 16:56:00 UTC
DescriptionContour is a Kubernetes ingress controller using Envoy proxy. In Contour before version 1.17.1 a specially crafted ExternalName type Service may be used to access Envoy's admin interface, which Contour normally prevents from access outside the Envoy container. This can be used to shut down Envoy remotely (a denial of service), or to expose the existence of any Secret that Envoy is using for its configuration, including most notably TLS Keypairs. However, it *cannot* be used to get the *content* of those secrets. Since this attack allows access to the administration interface, a variety of administration options are available, such as shutting down the Envoy or draining traffic. In general, the Envoy admin interface cannot easily be used for making changes to the cluster, in-flight requests, or backend services, but it could be used to shut down or drain Envoy, change traffic routing, or to retrieve secret metadata, as mentioned above. The issue will be addressed in Contour v1.18.0 and a cherry-picked patch release, v1.17.1, has been released to cover users who cannot upgrade at this time. For more details refer to the linked GitHub Security Advisory.

Risk And Classification

Problem Types: CWE-610

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Projectcontour Contour All All All All

References

ReferenceSourceLinkTags
ExternalName Services can be used to gain access to Envoy's admin interface · Advisory · projectcontour/contour · GitHub CONFIRM github.com
Release Contour v1.17.1 · projectcontour/contour · GitHub MISC github.com
cherrypicks for v1.17.1 (#3909) · projectcontour/contour@b53a5c4 · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 981425 Go (go) Security Update for github.com/projectcontour/contour (GHSA-5ph6-qq5x-7jwc)
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