CVE-2023-27496 Envoy may crash when a redirect url without a state param is received in the oauth filter

2023-04-0419:48:56

CWE-20

GitHub_M

www.cve.org

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

7.8 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

32.0%

JSON

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, the OAuth filter assumes that a state query param is present on any response that looks like an OAuth redirect response. Sending it a request with the URI path equivalent to the redirect path, without the state parameter, will lead to abnormal termination of Envoy process. Versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9 contain a patch. The issue can also be mitigated by locking down OAuth traffic, disabling the filter, or by filtering traffic before it reaches the OAuth filter (e.g. via a lua script).

CNA Affected

[
  {
    "vendor": "envoyproxy",
    "product": "envoy",
    "versions": [
      {
        "version": ">= 1.25.0, < 1.25.3",
        "status": "affected"
      },
      {
        "version": ">= 1.24.0, < 1.24.4",
        "status": "affected"
      },
      {
        "version": ">= 1.23.0, < 1.23.6",
        "status": "affected"
      },
      {
        "version": "< 1.22.9",
        "status": "affected"
      }
    ]
  }
]