PT-2022-15011 · Envoy · Envoy

Mattklein123 · Published 2022-02-22 · Updated 2024-03-06 · CVE-2022-21656

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Envoy (affected versions not specified)

Description The issue is related to a "type confusion" bug in the default certificate validation routines when processing subjectAltNames. This allows, for example, an rfc822Name or uniformResourceIndicator to be authenticated as a domain name, enabling the bypassing of nameConstraints as processed by the underlying OpenSSL/BoringSSL implementation. As a result, Envoy will trust upstream certificates that should not be trusted, exposing the possibility of impersonation of arbitrary servers.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Type Confusion

Improper Certificate Validation

Weakness Enumeration

CWE-843

CWE-295

Related Identifiers

BIT-ENVOY-2022-21656

CVE-2022-21656

GHSA-C9G7-XWCV-PJX2

Affected Products

Envoy

References · 10

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21656.json · Exploit
• https://github.com/envoyproxy/envoy/commit/bb95af848c939cfe5b5ee33c5b1770558077e64e · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2022-21656 · Security Note
• https://osv.dev/vulnerability/BIT-envoy-2022-21656 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2022-21656 · Vendor Advisory
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2 · Note
• https://t.me/cvenotify/55026 · Telegram Post
• https://t.me/cvenotify/27609 · Telegram Post
• https://t.me/cibsecurity/37911 · Telegram Post
• https://t.me/cvenotify/27190 · Telegram Post