Bugzilla – Bug 1200401
VUL-0: CVE-2022-29224: envoy-proxy: Segfault in GrpcHealthCheckerImpl
Last modified: 2022-06-10 07:15:02 UTC
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 â€œholdâ€? (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.