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 "type 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.
Advisories
Source ID Title
EUVD EUVD EUVD-2022-26874 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 "type 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 23 Apr 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-04-23T19:01:38.563Z

Reserved: 2021-11-16T00:00:00.000Z

Link: CVE-2022-21656

cve-icon Vulnrichment

Updated: 2024-08-03T02:46:39.567Z

cve-icon NVD

Status : Modified

Published: 2022-02-22T23:15:11.223

Modified: 2024-11-21T06:45:10.103

Link: CVE-2022-21656

cve-icon Redhat

Severity : Moderate

Publid Date: 2022-02-23T00:00:00Z

Links: CVE-2022-21656 - Bugzilla

cve-icon OpenCVE Enrichment

No data.