Vulnerabilities in pkg:npm/node-extend

PACKAGE
Advisory Identifier: GHSA-cg42-4wrc-gp47
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Advisory Summary

CVE-2020-7673 is a CRITICAL (CVSS 9.8) code injection vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Node extend libraries in the npm ecosystem. The issue involves code injection in node-extend. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/node-extend

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/node-extend. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-cg42-4wrc-gp47 CVE-2020-7673 CRITICAL Code Injection in node-extend

CVE-2020-7673 at a Glance

CVE Identifier CVE-2020-7673
GHSA Identifier GHSA-cg42-4wrc-gp47
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Node extend
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-7673

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

node-extend fixed: Latest secure release 
npm install node-extend@Latest secure release
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 node-extend

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7673, inspect your project dependencies using npm:

npm ls node-extend

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

Note: The npm ls node-extend 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-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Node extend, 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

node-extend through 0.2.0 is vulnerable to Arbitrary Code Execution. User input provided to the argument `A` of `extend` function`(A,B,as,isAargs)` located within `lib/extend.js` is executed by the `eval` function, resulting in code execution.

CVE-2020-7673 Affected Node extend Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
node-extend
npm/node-extend
npm
≤ 0.2.0

References

NVD — CVE-2020-7673 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7673
snyk.io/vuln/snyk-js-nodeex... WEB
https://snyk.io/vuln/SNYK-JS-NODEEXTEND-571491

Frequently Asked Questions

What is CVE-2020-7673?
CVE-2020-7673 is a security vulnerability in Node extend involving Code Injection in node-extend under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Node extend versions are affected?
Affected versions include releases prior to current release patches across affected packages: node-extend.
What version fixes CVE-2020-7673?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is node-extend affected?
Yes, node-extend is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2020-7673?
CVE-2020-7673 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-7673?
CVE-2020-7673 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check npm dependencies for CVE-2020-7673?
Run the dependency tree command: 'npm ls node-extend'. 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-cg42-4wrc-gp47",
  "modified" : "2021-07-29T18:12:49Z",
  "published" : "2021-05-17T21:00:37Z",
  "aliases" : [ "CVE-2020-7673" ],
  "summary" : "Code Injection in node-extend",
  "details" : "node-extend through 0.2.0 is vulnerable to Arbitrary Code Execution. User input provided to the argument `A` of `extend` function`(A,B,as,isAargs)` located within `lib/extend.js` is executed by the `eval` function, resulting in code execution.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "node-extend"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7673"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-NODEEXTEND-571491"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-13T17:00:57Z",
    "nvd_published_at" : "2020-06-10T16:15:00Z"
  }
}