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CVE-2021-32781— Continued processing of requests after locally generated response

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 存在缓冲区错误漏洞，攻击者可利用该漏洞触发拒绝服务。

CVSS 8.6 · High EPSS 1.33% · P70
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I. Basic Information for CVE-2021-32781

Vulnerability Information
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Vulnerability Title
Continued processing of requests after locally generated response
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 存在缓冲区错误漏洞，攻击者可利用该漏洞触发拒绝服务。
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 >= 1.19.0, < 1.19.1 -

II. Public POCs for CVE-2021-32781

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III. Intelligence Information for CVE-2021-32781

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Vendor Advisories for CVE-2021-32781 (1)

Other References for CVE-2021-32781 (1)

Same Patch Batch · envoyproxy · 2021-08-24 · 5 CVEs total

CVE-2021-32777 8.6 HIGH Incorrect concatenation of multiple value request headers in ext-authz extension
CVE-2021-32779 8.6 HIGH Incorrectly handling of URI '#fragment' element as part of the path element
CVE-2021-32780 8.6 HIGH Incorrect handling of H/2 GOAWAY followed by SETTINGS frames
CVE-2021-32778 5.8 MEDIUM Excessive CPU utilization when closing HTTP/2 streams

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-32781

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