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CVE-2022-21656— X.509 subjectAltName matching bypass in Envoy

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是一款开源的分布式代理服务器。 Envoy 存在信任管理问题漏洞，该漏洞源于用于实现默认证书验证例程的 default_validator.cc 实现在处理 subjectAltNames 时存在 type confusion 错误。

CVSS 7.4 · High EPSS 0.67% · P50
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I. Basic Information for CVE-2022-21656

Vulnerability Information
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Vulnerability Title
X.509 subjectAltName matching bypass in Envoy
Source: CVE Program / CVE List V5
Vulnerability 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 "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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 存在信任管理问题漏洞，该漏洞源于用于实现默认证书验证例程的 default_validator.cc 实现在处理 subjectAltNames 时存在 type confusion 错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy < 1.20.2 -

II. Public POCs for CVE-2022-21656

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III. Intelligence Information for CVE-2022-21656

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Patches & Fixes for CVE-2022-21656 (1)

Vendor Advisories for CVE-2022-21656 (1)

Same Patch Batch · envoyproxy · 2022-02-22 · 8 CVEs total

CVE-2021-43826 7.5 HIGH Crash when tunneling TCP over HTTP in Envoy
CVE-2022-21655 7.5 HIGH Incorrect handling of internal redirects results in crash in Envoy
CVE-2021-43824 7.5 HIGH Null pointer dereference in envoy
CVE-2022-21654 7.4 HIGH Incorrect configuration handling allows TLS session re-use without re-validation in Envoy
CVE-2022-21657 6.8 MEDIUM X.509 Extended Key Usage and Trust Purposes bypass in Envoy
CVE-2021-43825 6.1 MEDIUM Use-after-free in Envoy
CVE-2022-23606 4.4 MEDIUM Crash when a cluster is deleted in Envoy

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-295

V. Comments for CVE-2022-21656

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