CVE-2022-29224

Description

Envoy is a cloud-native high-performance proxy. Versions of envoy prior to 1.22.1 are subject to a segmentation fault in the GrpcHealthCheckerImpl. Envoy can perform various types of upstream health checking. One of them uses gRPC. Envoy also has a feature which can “hold” (prevent removal) upstream hosts obtained via service discovery until configured active health checking fails. If an attacker controls an upstream host and also controls service discovery of that host (via DNS, the EDS API, etc.), an attacker can crash Envoy by forcing removal of the host from service discovery, and then failing the gRPC health check request. This will crash Envoy via a null pointer dereference. Users are advised to upgrade to resolve this vulnerability. Users unable to upgrade may disable gRPC health checking and/or replace it with a different health checking type as a mitigation.

How to fix CVE-2022-29224

To remediate CVE-2022-29224, upgrade the affected package to a fixed version below.

• —upgrade to 1.22.1 or later

Is CVE-2022-29224 being exploited?

Low — EPSS is 0.8%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 1.22.1

CVSS scores

References (3)

• WEBgithub.com/envoyproxy/envoy/commit/9b1c3962172a972bc0359398af6daa3790bb59db
• WEBgithub.com/envoyproxy/envoy/security/advisories/GHSA-m4j9-86g3-8f49
• WEBnvd.nist.gov/vuln/detail/CVE-2022-29224