CVE Vulnerability

CVE-2021-36371

Emissary-Ingress (formerly Ambassador API Gateway) through 1.13.9 allows attackers to bypass client certificate requirements (i.e., mTLS cert_required) on backend upstreams when more than one TLSContext is defined and at least one configuration exists that does not require client certificate authentication. The attacker must send an SNI specifying an unprotected backend and an HTTP Host header specifying a protected backend. (2.x versions are unaffected. 1.x versions are unaffected with certain configuration settings involving prune_unreachable_routes and a wildcard Host resource.)

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

3.7 /10

CVSS v3.0 : LOW

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/emissary-ingress/emissary/issues/3340 Exploit Third Party Advisory
https://github.com/emissary-ingress/emissary/releases/tag/v2.0.0-ea Release Notes Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:getambassador:emissary-ingress:*:*:*:*:*:*:*:*
Information

Published : 2021-07-09 09:15

Updated : 2021-07-14 02:57

NVD link : CVE-2021-36371

Mitre link : CVE-2021-36371

Products Affected
No products.
CWE
CWE-295

Improper Certificate Validation