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CVE-2024-23323— Excessive CPU usage when URI template matcher is configured using regex in Envoy

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之前版本存在资源管理错误漏洞，该漏洞源于使用正则表达式配置 URI 模板匹配器时会发生拒绝服务。

CVSS 4.3 · Medium EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2024-23323

Vulnerability Information
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Vulnerability Title
Excessive CPU usage when URI template matcher is configured using regex in Envoy
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a high-performance edge/middle/service proxy. The regex expression is compiled for every request and can result in high CPU usage and increased request latency when multiple routes are configured with such matchers. 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:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 1.29.1之前版本存在资源管理错误漏洞，该漏洞源于使用正则表达式配置 URI 模板匹配器时会发生拒绝服务。
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-2024-23323

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III. Intelligence Information for CVE-2024-23323

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Patches & Fixes for CVE-2024-23323 (1)

Vendor Advisories for CVE-2024-23323 (1)

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

CVE-2024-23324 8.6 HIGH Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata
CVE-2024-23322 7.5 HIGH Envoy crashes when idle and request per try timeout occur within the backoff interval
CVE-2024-23327 7.5 HIGH Crash in proxy protocol when command type of LOCAL in Envoy
CVE-2024-23325 7.5 HIGH Envoy crashes when using an address type that isn’t supported by the OS

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-400

V. Comments for CVE-2024-23323

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