Consul Envoy Extension Downsteam Proxy Configuration By Upstream Service Owner

published 2023-06-02 3 y ago modified 2026-09-10 59 d ago also BIT-consul-2023-2816 , EUVD-2023-1879 , GHSA-rqjq-ww83-wv5c , GO-2023-1828

cvss: 8.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

Consul and Consul Enterprise allowed any user with service:write permissions to use Envoy extensions configured via service-defaults to patch remote proxy instances that target the configured service, regardless of whether the user has permission to modify the service(s) corresponding to those modified proxies.

Patch / fix

fixed in 3 distros 1

go github.com/hashicorp/consul 1.15.3
bitnami consul 1.15.3
hashicorp consul 1.15.3

telegraf CBL-Mariner 2.0 1.28.5-1
telegraf Azure Linux 3.0 1.29.4-1

azure linux advisories AZL-27396 AZL-35303

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-10-07)

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
GitHub	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
OSV	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/hashicorp/consul	>=1.15.0, <1.15.3	1.15.3
bitnami	consul	>=1.15.0, <1.15.3	1.15.3

Affected products

HashiCorp Consul
HashiCorp Consul Enterprise

Classification

Weakness

CWE-266 Incorrect Privilege Assignment

References

discuss.hashicorp.com /t/hcsec-2023-16-consul-envoy-extension-downstream-proxy-configuration-by-upstream-service-owner/54525
web, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2023-2816
advisory, web
github.com /hashicorp/consul
package
github.com /advisories/GHSA-rqjq-ww83-wv5c
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary