CVE-2022-21656 Information

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. The default_validator.cc implementation used to implement the default certificate validation routines has a ype confusion\ bug when processing subjectAltNames. This processing allows for example an rfc822Name or uniformResourceIndicator to be authenticated as a domain name. This confusion allows for the bypassing of nameConstraints as processed by the underlying OpenSSL/BoringSSL implementation exposing the possibility of impersonation of arbitrary servers. As a result Envoy will trust upstream certificates that should not be trusted.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://github.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64e https://github.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.9