CVE-2020-7713: Arr flatten unflatten Prototype Pollution Vulnerability

CRITICAL
Advisory Identifier: GHSA-w8f3-pvx4-4c3h
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CVSS 9.8
CWE-1321
Published
Advisory Summary

CVE-2020-7713 is a CRITICAL (CVSS 9.8) prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Arr flatten unflatten libraries in the npm ecosystem. The issue involves prototype pollution in arr-flatten-unflatten. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7713 at a Glance

CVE Identifier CVE-2020-7713
GHSA Identifier GHSA-w8f3-pvx4-4c3h
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Arr flatten unflatten
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-2020-7713

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

arr-flatten-unflatten fixed: Latest secure release 
npm install arr-flatten-unflatten@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 arr-flatten-unflatten

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7713, inspect your project dependencies using npm:

npm ls arr-flatten-unflatten

Analyze the terminal output to locate any version of Arr flatten unflatten 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 arr-flatten-unflatten 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-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. In Arr flatten unflatten, 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

All versions of package arr-flatten-unflatten up to and including version 1.1.4 are vulnerable to Prototype Pollution via the constructor.

CVE-2020-7713 Affected Arr flatten unflatten Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
arr-flatten-unflatten
npm/arr-flatten-unflatten
npm
≤ 1.1.4

References

NVD — CVE-2020-7713 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7713
Arr flatten unflatten Source Repository REPOSITORY
https://github.com/Quernest/arr-flatten-unflatten/pull/8
Security Fix Commit FIX COMMIT
https://github.com/Quernest/arr-flatten-unflatten/commit/cb4351c75f87a4fbec3b6140c40ee2993f574372
snyk.io/vuln/snyk-js-arrfla... WEB
https://snyk.io/vuln/SNYK-JS-ARRFLATTENUNFLATTEN-598396

Frequently Asked Questions

What is CVE-2020-7713?
CVE-2020-7713 is a security vulnerability in Arr flatten unflatten involving Prototype Pollution in arr-flatten-unflatten under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Arr flatten unflatten versions are affected?
Affected versions include releases prior to current release patches across affected packages: arr-flatten-unflatten.
What version fixes CVE-2020-7713?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is arr-flatten-unflatten affected?
Yes, arr-flatten-unflatten 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-2020-7713?
CVE-2020-7713 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-2020-7713?
CVE-2020-7713 is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.).
How can I check npm dependencies for CVE-2020-7713?
Run the dependency tree command: 'npm ls arr-flatten-unflatten'. 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-w8f3-pvx4-4c3h",
  "modified" : "2022-12-03T04:07:10Z",
  "published" : "2021-05-06T18:11:39Z",
  "aliases" : [ "CVE-2020-7713" ],
  "summary" : "Prototype Pollution in arr-flatten-unflatten",
  "details" : "All versions of package arr-flatten-unflatten up to and including version 1.1.4 are vulnerable to Prototype Pollution via the constructor.",
  "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" : "arr-flatten-unflatten"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.1.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7713"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Quernest/arr-flatten-unflatten/pull/8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Quernest/arr-flatten-unflatten/commit/cb4351c75f87a4fbec3b6140c40ee2993f574372"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-ARRFLATTENUNFLATTEN-598396"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-05T19:00:34Z",
    "nvd_published_at" : "2020-09-01T09:15:00Z"
  }
}