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CVE-2022-23606— Crash when a cluster is deleted 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 存在安全漏洞，该漏洞源于当通过集群发现服务 (CDS) 删除集群时，与该集群中的端点建立的所有空闲连接都将断开连接。 在断开空闲连接的过程中引入了递归，当集群有大量空闲连接时，可能导致堆栈耗尽和进程异常终止。 这种无限递归导致 Envoy 崩溃。 建议用户升级。

CVSS 4.4 · Medium EPSS 1.02% · P62

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-23606

Vulnerability Information
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Vulnerability Title
Crash when a cluster is deleted in Envoy
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
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，该漏洞源于当通过集群发现服务 (CDS) 删除集群时，与该集群中的端点建立的所有空闲连接都将断开连接。 在断开空闲连接的过程中引入了递归，当集群有大量空闲连接时，可能导致堆栈耗尽和进程异常终止。 这种无限递归导致 Envoy 崩溃。 建议用户升级。
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 >= 1.20.0, < 1.20.2 -

II. Public POCs for CVE-2022-23606

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III. Intelligence Information for CVE-2022-23606

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Patches & Fixes for CVE-2022-23606 (1)

Vendor Advisories for CVE-2022-23606 (1)

Same Patch Batch · envoyproxy · 2022-02-22 · 8 CVEs total

CVE-2021-43826 7.5 HIGH Crash when tunneling TCP over HTTP in Envoy
CVE-2022-21655 7.5 HIGH Incorrect handling of internal redirects results in crash in Envoy
CVE-2021-43824 7.5 HIGH Null pointer dereference in envoy
CVE-2022-21654 7.4 HIGH Incorrect configuration handling allows TLS session re-use without re-validation in Envoy
CVE-2022-21656 7.4 HIGH X.509 subjectAltName matching bypass in Envoy
CVE-2022-21657 6.8 MEDIUM X.509 Extended Key Usage and Trust Purposes bypass in Envoy
CVE-2021-43825 6.1 MEDIUM Use-after-free in Envoy

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-674

V. Comments for CVE-2022-23606

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