CVE-2020-28501: Es6 crawler detect Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-jxg6-fhwc-9v9c
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CVSS 5.3
CWE-400
Published
Advisory Summary

CVE-2020-28501 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Es6 crawler detect libraries in the npm ecosystem. The issue involves regular expression denial of service (redos) in es6-crawler-detect. Remediation is available by upgrading affected packages to version 3.1.3.

CVE-2020-28501 at a Glance

CVE Identifier CVE-2020-28501
GHSA Identifier GHSA-jxg6-fhwc-9v9c
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Es6 crawler detect
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:L).

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 Low (A:L)

How to Fix CVE-2020-28501

To remediate this vulnerability, upgrade all affected Es6 crawler detect dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

es6-crawler-detect fixed: 3.1.3 
npm install es6-crawler-detect@3.1.3
Verify Direct and Transitive Dependencies

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

npm ls es6-crawler-detect

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-28501, inspect your project dependencies using npm:

npm ls es6-crawler-detect

Analyze the terminal output to locate any version of Es6 crawler detect in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.3), your application is affected.

Note: The npm ls es6-crawler-detect command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Es6 crawler detect, 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

This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.

CVE-2020-28501 Affected Es6 crawler detect Versions

1 component(s)
Fixed Versions:
3.1.3
Product / Package Ecosystem Affected Versions Fixed Version
es6-crawler-detect
npm/es6-crawler-detect
npm
< 3.1.3
3.1.3

References

NVD — CVE-2020-28501 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-28501
Es6 crawler detect Source Repository REPOSITORY
https://github.com/JefferyHus/es6-crawler-detect/pull/27
snyk.io/vuln/snyk-js-es6cra... WEB
https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529

Frequently Asked Questions

What is CVE-2020-28501?
CVE-2020-28501 is a security vulnerability in Es6 crawler detect involving Regular Expression Denial of Service (ReDoS) in es6-crawler-detect under CWE-400: Uncontrolled Resource Consumption.
Which Es6 crawler detect versions are affected?
Affected versions include releases prior to 3.1.3 across affected packages: es6-crawler-detect.
What version fixes CVE-2020-28501?
Upgrading to 3.1.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is es6-crawler-detect affected?
Yes, es6-crawler-detect is affected in releases prior to 3.1.3. Upgrade your dependency to 3.1.3 or later.
What is the CVSS score of CVE-2020-28501?
CVE-2020-28501 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2020-28501?
CVE-2020-28501 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2020-28501?
Run the dependency tree command: 'npm ls es6-crawler-detect'. 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-jxg6-fhwc-9v9c",
  "modified" : "2021-03-23T19:29:27Z",
  "published" : "2021-04-13T15:19:39Z",
  "aliases" : [ "CVE-2020-28501" ],
  "summary" : "Regular Expression Denial of Service (ReDoS) in es6-crawler-detect",
  "details" : "This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "es6-crawler-detect"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-28501"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/JefferyHus/es6-crawler-detect/pull/27"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-23T19:29:27Z",
    "nvd_published_at" : "2021-03-22T12:15:00Z"
  }
}