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CVE-2023-35941— Envoy vulnerable to OAuth2 credentials exploit with permanent validity

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存在安全漏洞，该漏洞源于恶意客户端能够在某些特定场景中构造永久有效的凭据。

CVSS 8.6 · High EPSS 0.81% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-35941

Vulnerability Information
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Vulnerability Title
Envoy vulnerable to OAuth2 credentials exploit with permanent validity
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 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, a malicious client is able to construct credentials with permanent validity in some specific scenarios. This is caused by the some rare scenarios in which HMAC payload can be always valid in OAuth2 filter's check. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, avoid wildcards/prefix domain wildcards in the host's domain configuration.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy存在安全漏洞，该漏洞源于恶意客户端能够在某些特定场景中构造永久有效的凭据。
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 >= 1.26.0, < 1.26.4 -

II. Public POCs for CVE-2023-35941

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III. Intelligence Information for CVE-2023-35941

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Vendor Advisories for CVE-2023-35941 (1)

Same Patch Batch · envoyproxy · 2023-07-25 · 4 CVEs total

CVE-2023-35944 8.2 HIGH Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case sche
CVE-2023-35942 6.5 MEDIUM Envoy's gRPC access log crash caused by the listener draining
CVE-2023-35943 6.3 MEDIUM Envoy vulnerable to CORS filter segfault when origin header is removed

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-116

V. Comments for CVE-2023-35941

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