CVE-2021-36371

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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.)

3.7 /10

CVSS v3 : 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

4.3 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:N/I:P/A:N

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

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 (hide)

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

14 Jul 2021, 14:57

Type Values Removed Values Added
References
  • (MISC) https://github.com/emissary-ingress/emissary/releases/tag/v2.0.0-ea - Release Notes, Third Party Advisory
References (MISC) https://github.com/emissary-ingress/emissary/issues/3340 - (MISC) https://github.com/emissary-ingress/emissary/issues/3340 - Exploit, Third Party Advisory
CPE cpe:2.3:a:getambassador:emissary-ingress:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : 4.3
v3 : 3.7
CWE CWE-295

12 Jul 2021, 20:15

Type Values Removed Values Added
Summary 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. 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.)

09 Jul 2021, 21:15

Type Values Removed Values Added
New CVE
Information

Published : 2021-07-09 21:15

Updated : 2023-12-10 13:55

NVD link : CVE-2021-36371

Mitre link : CVE-2021-36371

CVE.ORG link : CVE-2021-36371

JSON object : View

Products Affected

getambassador

  • emissary-ingress
CWE
CWE-295

Improper Certificate Validation