CVE-2019-8336: Github.com/hashicorp/consul HashiCorp Consul Access Restriction Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-fhm8-cxcv-pwvc
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CVSS 8.1
CWE-284
Published
Advisory Summary

CVE-2019-8336 is a HIGH (CVSS 8.1) hashicorp consul access restriction bypass vulnerability (CWE-284: Improper Access Control) affecting Github.com/hashicorp/consul libraries in the Go ecosystem. The issue involves hashicorp consul access restriction bypass. Remediation is available by upgrading affected packages to version 1.4.3.

CVE-2019-8336 at a Glance

CVE Identifier CVE-2019-8336
GHSA Identifier GHSA-fhm8-cxcv-pwvc
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-284: Improper Access Control
Affected Product Github.com/hashicorp/consul
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2019-8336

To remediate this vulnerability, upgrade all affected Github.com/hashicorp/consul dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/hashicorp/consul fixed: 1.4.3 
Upgrade github.com/hashicorp/consul to 1.4.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/hashicorp/consul

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-8336, inspect your project dependencies for Github.com/hashicorp/consul:

inspect dependencies for github.com/hashicorp/consul

Analyze the terminal output to locate any version of Github.com/hashicorp/consul in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Github.com/hashicorp/consul, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2019-8336 Affected Github.com/hashicorp/consul Versions

1 component(s)
Fixed Versions:
1.4.3
Product / Package Ecosystem Affected Versions Fixed Version
github.com/hashicorp/consul
golang/github.com/hashicorp/consul
Go
≥ 1.4.0
< 1.4.3
1.4.3

References

NVD — CVE-2019-8336 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-8336
Github.com/hashicorp/consul Source Repository REPOSITORY
https://github.com/hashicorp/consul/issues/5423
Security Fix Commit FIX COMMIT
https://github.com/hashicorp/consul/commit/90040f8bffb311e6cd8599273e95b607175e311f
Github.com/hashicorp/consul Source Repository REPOSITORY
https://github.com/hashicorp/consul
Github.com/hashicorp/consul Source Repository REPOSITORY
https://github.com/hashicorp/consul/blob/003370ded024096cd89fb2aa2bc15293c23b9707/agent/consul/leader.go#L405

Frequently Asked Questions

What is CVE-2019-8336?
CVE-2019-8336 is a security vulnerability in Github.com/hashicorp/consul involving HashiCorp Consul Access Restriction Bypass under CWE-284: Improper Access Control.
Which Github.com/hashicorp/consul versions are affected?
Affected versions include releases prior to 1.4.3 across affected packages: github.com/hashicorp/consul.
What version fixes CVE-2019-8336?
Upgrading to 1.4.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/hashicorp/consul affected?
Yes, github.com/hashicorp/consul is affected in releases prior to 1.4.3. Upgrade your dependency to 1.4.3 or later.
What is the CVSS score of CVE-2019-8336?
CVE-2019-8336 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-8336?
CVE-2019-8336 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Go dependencies for CVE-2019-8336?
Run the dependency tree command: 'inspect dependencies for github.com/hashicorp/consul'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fhm8-cxcv-pwvc",
  "modified" : "2023-09-28T20:29:24Z",
  "published" : "2022-05-13T01:22:55Z",
  "aliases" : [ "CVE-2019-8336" ],
  "summary" : "HashiCorp Consul Access Restriction Bypass",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/consul"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.4.0"
      }, {
        "fixed" : "1.4.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-8336"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/consul/issues/5423"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/consul/commit/90040f8bffb311e6cd8599273e95b607175e311f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hashicorp/consul"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/consul/blob/003370ded024096cd89fb2aa2bc15293c23b9707/agent/consul/leader.go#L405"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-19T18:40:12Z",
    "nvd_published_at" : "2019-03-05T23:29:00Z"
  }
}