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CVE-2023-27487— Envoy client may fake the header `x-envoy-original-path`

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是一款开源的分布式代理服务器。 Envoy 存在输入验证错误漏洞，该漏洞源于客户端可能会绕过 JSON Web Token (JWT) 检查并伪造伪造的原始路径。

CVSS 8.2 · High EPSS 0.64% · P48
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I. Basic Information for CVE-2023-27487

Vulnerability Information
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Vulnerability Title
Envoy client may fake the header `x-envoy-original-path`
Source: CVE Program / CVE List V5
Vulnerability Description
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 client may bypass JSON Web Token (JWT) checks and forge fake original paths. The header `x-envoy-original-path` should be an internal header, but Envoy does not remove this header from the request at the beginning of request processing when it is sent from an untrusted client. The faked header would then be used for trace logs and grpc logs, as well as used in the URL used for `jwt_authn` checks if the `jwt_authn` filter is used, and any other upstream use of the x-envoy-original-path header. Attackers may forge a trusted `x-envoy-original-path` header. Versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9 have patches for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 存在输入验证错误漏洞，该漏洞源于客户端可能会绕过 JSON Web Token (JWT) 检查并伪造伪造的原始路径。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.25.0, <1.25.3 -

II. Public POCs for CVE-2023-27487

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III. Intelligence Information for CVE-2023-27487

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Vendor Advisories for CVE-2023-27487 (1)

Same Patch Batch · envoyproxy · 2023-04-04 · 6 CVEs total

CVE-2023-27493 8.1 HIGH Envoy doesn't escape HTTP header values
CVE-2023-27496 6.5 MEDIUM Envoy may crash when a redirect url without a state param is received in the oauth filter
CVE-2023-27488 5.4 MEDIUM Envoy gRPC client produces invalid protobuf when an HTTP header with non-UTF8 value is rec
CVE-2023-27491 5.4 MEDIUM Envoy forwards invalid Http2/Http3 downstream headers
CVE-2023-27492 4.8 MEDIUM Envoy may crash when a large request body is processed in Lua filter

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-20

V. Comments for CVE-2023-27487

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