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

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 1.22.9之后版本存在输入验证错误漏洞。攻击者利用该漏洞导致Envoy进程异常终止。

CVSS 6.5 · Medium EPSS 0.76% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-27496

Vulnerability Information
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Vulnerability Title
Envoy may crash when a redirect url without a state param is received in the oauth filter
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 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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 1.22.9之后版本存在输入验证错误漏洞。攻击者利用该漏洞导致Envoy进程异常终止。
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-2023-27496

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III. Intelligence Information for CVE-2023-27496

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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-2023-27488 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-2023-27496

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