CVE-2021-36371

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Summary

CVECVE-2021-36371
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-07-09 21:15:00 UTC
Updated2021-07-14 14:57:00 UTC
DescriptionEmissary-Ingress (formerly Ambassador API Gateway) through 1.13.9 allows attackers to bypass client certificate requirements (i.e., mTLS cert_required) on backend upstreams when more than one TLSContext is defined and at least one configuration exists that does not require client certificate authentication. The attacker must send an SNI specifying an unprotected backend and an HTTP Host header specifying a protected backend. (2.x versions are unaffected. 1.x versions are unaffected with certain configuration settings involving prune_unreachable_routes and a wildcard Host resource.)

Risk And Classification

Problem Types: CWE-295

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Getambassador Emissary-ingress All All All All

References

ReferenceSourceLinkTags
Bypass mTLS by mixing SNI and Host headers · Issue #3340 · emissary-ingress/emissary · GitHub MISC github.com
Release Emissary Ingress 2.0.0-ea · emissary-ingress/emissary · GitHub MISC github.com Release Notes, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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