Emissary-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.)
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-07-09T20:19:45

Updated: 2024-08-04T00:54:51.414Z

Reserved: 2021-07-09T00:00:00

Link: CVE-2021-36371

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-07-09T21:15:08.583

Modified: 2021-07-14T14:57:33.607

Link: CVE-2021-36371

cve-icon Redhat

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