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CVE-2023-27491— Envoy forwards invalid Http2/Http3 downstream headers

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存在环境问题漏洞，该漏洞源于不兼容的 HTTP/1 服务允许格式错误的请求，从而导致安全策略被绕过。以下是受影响的版本：1.26.0之前版本，1.25.3之前版本，1.24.4之前版本，1.23.6之前版本，1.22.9之前版本。

CVSS 5.4 · Medium EPSS 0.87% · P57

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-27491

Vulnerability Information
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Vulnerability Title
Envoy forwards invalid Http2/Http3 downstream headers
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy存在环境问题漏洞，该漏洞源于不兼容的 HTTP/1 服务允许格式错误的请求，从而导致安全策略被绕过。以下是受影响的版本：1.26.0之前版本，1.25.3之前版本，1.24.4之前版本，1.23.6之前版本，1.22.9之前版本。
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-2023-27491

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III. Intelligence Information for CVE-2023-27491

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Vendor Advisories for CVE-2023-27491 (1)

Other References for CVE-2023-27491 (3)

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

CVE-2023-27487 8.2 HIGH Envoy client may fake the header `x-envoy-original-path`
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-2023-27492 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-2023-27491

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