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CVE-2024-23324— Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata

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 1.29.1之前版本存在安全漏洞，该漏洞源于使用 PROXY协议的下游连接可以绕过外部身份验证。

CVSS 8.6 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2024-23324

Vulnerability Information
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Vulnerability Title
Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/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 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 1.29.1之前版本存在安全漏洞，该漏洞源于使用 PROXY协议的下游连接可以绕过外部身份验证。
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 >= 1.29.0, < 1.29.1 -

II. Public POCs for CVE-2024-23324

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III. Intelligence Information for CVE-2024-23324

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Patches & Fixes for CVE-2024-23324 (1)

Vendor Advisories for CVE-2024-23324 (1)

Same Patch Batch · envoyproxy · 2024-02-09 · 5 CVEs total

CVE-2024-23322 7.5 HIGH Envoy crashes when idle and request per try timeout occur within the backoff interval
CVE-2024-23325 7.5 HIGH Envoy crashes when using an address type that isn’t supported by the OS
CVE-2024-23327 7.5 HIGH Crash in proxy protocol when command type of LOCAL in Envoy
CVE-2024-23323 4.3 MEDIUM Excessive CPU usage when URI template matcher is configured using regex in Envoy

IV. Related Vulnerabilities

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

V. Comments for CVE-2024-23324

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