CVE-2021-32781

描述

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.

如何修補 CVE-2021-32781

要修補 CVE-2021-32781,請將受影響套件升級到下列已修補版本。

• —升級至 1.16.5 或更新版本

CVE-2021-32781 正在被利用嗎?

低 — EPSS 為 1.3%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 1.16.0, < 1.16.5, >= 1.17.0, < 1.17.4, >= 1.18.0, < 1.18.4, >= 1.19.0, < 1.19.1

CVSS 分數

參考連結(3)

• WEBgithub.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv
• WEBnvd.nist.gov/vuln/detail/CVE-2021-32781
• WEBwww.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history