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Envoy Proxy Improper Certificate Validation Vulnerability - CVE-2022-21657 - Vulnerability Database
Envoy Proxy

Envoy Proxy Improper Certificate Validation Vulnerability - CVE-2022-21657

Medium
Reference: CVE-2022-21657
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2022-21657
Title: Envoy Proxy Improper Certificate Validation Vulnerability
Overview:

Envoy is an open source edge and service proxy designed for cloud-native applications. In affected versions Envoy does not restrict the set of certificates it accepts from the peer either as a TLS client or a TLS server to only those certificates that contain the necessary extendedKeyUsage (id-kp-serverAuth and id-kp-clientAuth respectively). This means that a peer may present an e-mail certificate (e.g. id-kp-emailProtection) either as a leaf certificate or as a CA in the chain and it will be accepted for TLS. This is particularly bad when combined with the issue described in pull request 630 in that it allows a Web PKI CA that is intended only for use with S/MIME and thus exempted from audit or supervision to issue TLS certificates that will be accepted by Envoy. As a result Envoy will trust upstream certificates that should not be trusted. There are no known workarounds to this issue. Users are advised to upgrade.