CVE-2022-21657

Summary

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.

Affected Software

Weaknesses

• CWE-295: CWE-295: Improper Certificate Validation

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-837m-wjrv-vm5g
• https://github.com/envoyproxy/envoy/pull/630

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-837m-wjrv-vm5g
• https://github.com/envoyproxy/envoy/pull/630

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