AI description
Automated description summarized from trusted sources.
CVE-2023-30845 describes an authentication bypass vulnerability found in Google's Extensible Service Proxy (ESPv2), affecting versions 2.20.0 through 2.42.0. This flaw allows malicious API clients to circumvent JSON Web Token (JWT) authentication. The bypass is achieved by crafting a request with a specially manipulated `X-HTTP-Method-Override` header. This vulnerability can be exploited under specific conditions: when the requested HTTP method is not defined in the API service specification (such as an OpenAPI spec or gRPC `google.api.http` proto annotations), and the `X-HTTP-Method-Override` value itself corresponds to a valid HTTP method within that API service definition.
- Description
- ESPv2 is a service proxy that provides API management capabilities using Google Service Infrastructure. ESPv2 2.20.0 through 2.42.0 contains an authentication bypass vulnerability. API clients can craft a malicious `X-HTTP-Method-Override` header value to bypass JWT authentication in specific cases. ESPv2 allows malicious requests to bypass authentication if both the conditions are true: The requested HTTP method is **not** in the API service definition (OpenAPI spec or gRPC `google.api.http` proto annotations, and the specified `X-HTTP-Method-Override` is a valid HTTP method in the API service definition. ESPv2 will forward the request to your backend without checking the JWT. Attackers can craft requests with a malicious `X-HTTP-Method-Override` value that allows them to bypass specifying JWTs. Restricting API access with API keys works as intended and is not affected by this vulnerability. Upgrade deployments to release v2.43.0 or higher to receive a patch. This release ensures that JWT authentication occurs, even when the caller specifies `x-http-method-override`. `x-http-method-override` is still supported by v2.43.0+. API clients can continue sending this header to ESPv2.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
CVSS 3.1
- Type
- Primary
- Base score
- 9.8
- Impact score
- 5.9
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity
- CRITICAL
- security-advisories@github.com
- CWE-287
- Hype score
- Not currently trending
[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:google:espv2:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A20AE068-D587-4CD1-AA65-AC686DDF6E4D",
"versionEndExcluding": "2.43.0",
"versionStartIncluding": "2.20.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
]