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CVE-2022-29227— Use after free 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 1.22.1 之前的版本存在安全漏洞，该漏洞源于Envoy 内部重定向带有正文或预告片的请求是不安全的。攻击者利用该漏洞可以使服务崩溃。

CVSS 7.5 · High EPSS 1.17% · P65
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I. Basic Information for CVE-2022-29227

Vulnerability Information
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Vulnerability Title
Use after free in Envoy
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a cloud-native high-performance edge/middle/service proxy. In versions prior to 1.22.1 if Envoy attempts to send an internal redirect of an HTTP request consisting of more than HTTP headers, there’s a lifetime bug which can be triggered. If while replaying the request Envoy sends a local reply when the redirect headers are processed, the downstream state indicates that the downstream stream is not complete. On sending the local reply, Envoy will attempt to reset the upstream stream, but as it is actually complete, and deleted, this result in a use-after-free. Users are advised to upgrade. Users unable to upgrade are advised to disable internal redirects if crashes are observed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 1.22.1 之前的版本存在安全漏洞，该漏洞源于Envoy 内部重定向带有正文或预告片的请求是不安全的。攻击者利用该漏洞可以使服务崩溃。
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 < 1.22.1 -

II. Public POCs for CVE-2022-29227

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III. Intelligence Information for CVE-2022-29227

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Patches & Fixes for CVE-2022-29227 (1)

Vendor Advisories for CVE-2022-29227 (1)

Same Patch Batch · envoyproxy · 2022-06-09 · 5 CVEs total

CVE-2022-29226 10.0 CRITICAL Trivial authentication bypass in Envoy
CVE-2022-29228 7.5 HIGH Reachable assertion in Envoy
CVE-2022-29225 7.5 HIGH Zip bomb vulnerability in Envoy
CVE-2022-29224 5.9 MEDIUM Segmentation fault leading to crash in Envoy

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-416

V. Comments for CVE-2022-29227

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