# CVE-2019-8336: HashiCorp Consul Access Restriction Bypass

> Attackers can bypass access restrictions to obtain privileges of arbitrary tokens in secondary datacenters by exploiting a hardcoded secret value.

- **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Mar 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fhm8-cxcv-pwvc, GO-2023-1945

## What is CVE-2019-8336?

CVE-2019-8336 is a high-severity authentication bypass vulnerability in n/a, published on 5 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

HashiCorp Consul (and Consul Enterprise) 1.4.x before 1.4.3 allows a client to bypass intended access restrictions and obtain the privileges of one other arbitrary token within secondary datacenters, because a token with literally "<hidden>" as its secret is used in unusual circumstances.

## Which versions are affected by CVE-2019-8336?

3 open source packages ship an affected version, including github.com/hashicorp/consul. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/hashicorp/consul` | Go | From 1.4.0 | 1.4.3 |
| `github.com/hashicorp/consul` | Go | From 1.4.0 | 1.4.3 |
| `github.com/hashicorp/consul` | Go | From 1.4.0 | 1.4.3 |

Products: Hashicorp Consul.

## How do I fix CVE-2019-8336?

Upgrade github.com/hashicorp/consul to 1.4.3 or later.

## Is CVE-2019-8336 being exploited?

There is no known exploitation of CVE-2019-8336 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-41805](https://insights.sbomify.com/CVE-2021-41805/): Privilege escalation in n/a (high 8.8)
- [CVE-2021-37219](https://insights.sbomify.com/CVE-2021-37219/): HashiCorp Consul Privilege Escalation Vulnerability (high 8.8)
- [CVE-2023-2816](https://insights.sbomify.com/CVE-2023-2816/): Consul Envoy Extension Downsteam Proxy Configuration By Upstream Service Owner (high 8.7)
- [CVE-2024-10006](https://insights.sbomify.com/CVE-2024-10006/): Consul L7 Intentions Vulnerable To Headers Bypass (high 8.3)
- [CVE-2024-10005](https://insights.sbomify.com/CVE-2024-10005/): Consul L7 Intentions Vulnerable To URL Path Bypass (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-8336 and fix it if it is affected.

What it is: CVE-2019-8336 is a high-severity authentication bypass vulnerability in n/a, published on 5 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-8336 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/hashicorp/consul (Go): affected from 1.4.0; fixed in 1.4.3
- github.com/hashicorp/consul (Go): affected from 1.4.0; fixed in 1.4.3
- github.com/hashicorp/consul (Go): affected from 1.4.0; fixed in 1.4.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-8336/ (Markdown: https://insights.sbomify.com/CVE-2019-8336/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-8336
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-8336
- OSV: https://osv.dev/vulnerability/CVE-2019-8336

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-8336/
Summaries are generated and may contain mistakes; the official description above is the record.