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CVE-2023-35942— Envoy's gRPC access log crash caused by the listener draining

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存在资源管理错误漏洞，该漏洞源于使用全局范围的gRPC访问记录器可能会在侦听器耗尽时导致释放后重用崩溃。

CVSS 6.5 · Medium EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-35942

Vulnerability Information
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Vulnerability Title
Envoy's gRPC access log crash caused by the listener draining
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, gRPC access loggers using listener's global scope can cause a `use-after-free` crash when the listener is drained. 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, disable gRPC access log or stop listener update.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
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存在资源管理错误漏洞，该漏洞源于使用全局范围的gRPC访问记录器可能会在侦听器耗尽时导致释放后重用崩溃。
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-2023-35942

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III. Intelligence Information for CVE-2023-35942

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Vendor Advisories for CVE-2023-35942 (1)

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

CVE-2023-35941 8.6 HIGH Envoy vulnerable to OAuth2 credentials exploit with permanent validity
CVE-2023-35944 8.2 HIGH Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case sche
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-416

V. Comments for CVE-2023-35942

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