CVE-2020-25201: Github.com/hashicorp/consul Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-496g-fr33-whrf
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CVSS 7.5
CWE-834 CWE-400
Published
Advisory Summary

CVE-2020-25201 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-834: Excessive Iteration) affecting Github.com/hashicorp/consul libraries in the Go ecosystem. The issue involves denial of service in hashicorp consul. Remediation is available by upgrading affected packages to version 1.7.9, 1.8.5.

CVE-2020-25201 at a Glance

CVE Identifier CVE-2020-25201
GHSA Identifier GHSA-496g-fr33-whrf
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-834: Excessive Iteration
Affected Product Github.com/hashicorp/consul
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

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

How to Fix CVE-2020-25201

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: 1.7.9 
Upgrade github.com/hashicorp/consul to 1.7.9
github.com/hashicorp/consul fixed: 1.8.5 
Upgrade github.com/hashicorp/consul to 1.8.5
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-2020-25201, 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 1.7.9), 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-834: Excessive Iteration, where the product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed. 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 Enterprise versions 1.7.0 up to 1.7.8 and 1.8.0 up to 1.8.4 includes a namespace replication bug which can be triggered to cause denial of service via infinite Raft writes. Fixed in 1.7.9 and 1.8.5.

CVE-2020-25201 Affected Github.com/hashicorp/consul Versions

2 component(s)
Fixed Versions:
1.7.91.8.5
Product / Package Ecosystem Affected Versions Fixed Version
github.com/hashicorp/consul
golang/github.com/hashicorp/consul
Go
≥ 1.7.0
< 1.7.9
1.7.9
github.com/hashicorp/consul
golang/github.com/hashicorp/consul
Go
≥ 1.8.0
< 1.8.5
1.8.5

References

NVD — CVE-2020-25201 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-25201
Github.com/hashicorp/consul Source Repository REPOSITORY
https://github.com/hashicorp/consul/pull/9024
Github.com/hashicorp/consul Source Repository REPOSITORY
https://github.com/hashicorp/consul/blob/master/CHANGELOG.md#185-october-23-2020
Github.com/hashicorp/consul Release RELEASE
https://github.com/hashicorp/consul/releases/tag/v1.8.5
Github.com/hashicorp/consul Security Information SECURITY
https://security.gentoo.org/glsa/202208-09
www.hashicorp.com/blog/category/consu... WEB
https://www.hashicorp.com/blog/category/consul

Frequently Asked Questions

What is CVE-2020-25201?
CVE-2020-25201 is a security vulnerability in Github.com/hashicorp/consul involving Denial of service in HashiCorp Consul under CWE-834: Excessive Iteration.
Which Github.com/hashicorp/consul versions are affected?
Affected versions include releases prior to 1.7.9, 1.8.5 across affected packages: github.com/hashicorp/consul.
What version fixes CVE-2020-25201?
Upgrading to 1.7.9, 1.8.5 (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 1.7.9, 1.8.5. Upgrade your dependency to 1.7.9, 1.8.5 or later.
What is the CVSS score of CVE-2020-25201?
CVE-2020-25201 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-25201?
CVE-2020-25201 is classified under CWE-834: Excessive Iteration (The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.).
How can I check Go dependencies for CVE-2020-25201?
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-496g-fr33-whrf",
  "modified" : "2024-01-31T23:11:24Z",
  "published" : "2024-01-31T23:11:24Z",
  "aliases" : [ "CVE-2020-25201" ],
  "summary" : "Denial of service in HashiCorp Consul",
  "details" : "HashiCorp Consul Enterprise versions 1.7.0 up to 1.7.8 and 1.8.0 up to 1.8.4 includes a namespace replication bug which can be triggered to cause denial of service via infinite Raft writes. Fixed in 1.7.9 and 1.8.5.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/consul"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.7.0"
      }, {
        "fixed" : "1.7.9"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/consul"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.8.0"
      }, {
        "fixed" : "1.8.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-25201"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/consul/pull/9024"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/consul/blob/master/CHANGELOG.md#185-october-23-2020"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/consul/releases/tag/v1.8.5"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202208-09"
  }, {
    "type" : "WEB",
    "url" : "https://www.hashicorp.com/blog/category/consul"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-834" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-31T23:11:24Z",
    "nvd_published_at" : "2020-11-04T23:15:11Z"
  }
}