Bug 2057272 (CVE-2022-21657) - CVE-2022-21657 envoy: X.509 Extended Key Usage and Trust Purposes bypass
Summary: CVE-2022-21657 envoy: X.509 Extended Key Usage and Trust Purposes bypass
Keywords:
Status: NEW
Alias: CVE-2022-21657
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 2050760
TreeView+ depends on / blocked
 
Reported: 2022-02-23 06:31 UTC by Avinash Hanwate
Modified: 2022-03-22 18:19 UTC (History)
2 users (show)

Fixed In Version: envoy 1.18.6, envoy 1.19.3, envoy 1.20.2
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in envoy. This issue occurs when it does not restrict the set of certificates it accepts from the peer, either as a TLS client or a TLS server, and only to those certificates that contain the necessary extendedKeyUsage (id-kp-serverAuth and id-kp-clientAuth, respectively).
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Description Avinash Hanwate 2022-02-23 06:31:15 UTC
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.

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


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