CVE-2020-7644: Fun map Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-p33m-7w7f-gmj8
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CVSS 8.1
CWE-1321 CWE-915
Published
Advisory Summary

CVE-2020-7644 is a HIGH (CVSS 8.1) remote code execution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Fun map libraries in the npm ecosystem. The issue involves uncontrolled resource consumption in fun-map. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7644 at a Glance

CVE Identifier CVE-2020-7644
GHSA Identifier GHSA-p33m-7w7f-gmj8
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Fun map
Package Ecosystem npm
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:3.1/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-2020-7644

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

fun-map fixed: Latest secure release 
npm install fun-map@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 fun-map

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7644, inspect your project dependencies using npm:

npm ls fun-map

Analyze the terminal output to locate any version of Fun map 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 fun-map 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 Fun map, 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

fun-map through 3.3.1 is vulnerable to Prototype Pollution. The function assocInM could be tricked into adding or modifying properties of 'Object.prototype' using a '__proto__' payload.

CVE-2020-7644 Affected Fun map Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
fun-map
npm/fun-map
npm
≤ 3.3.1

References

NVD — CVE-2020-7644 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7644
Fun map Source Repository REPOSITORY
https://github.com/nathan7/fun-map/blob/master/index.js#L137,
snyk.io/vuln/snyk-js-funmap... WEB
https://snyk.io/vuln/SNYK-JS-FUNMAP-564436

Frequently Asked Questions

What is CVE-2020-7644?
CVE-2020-7644 is a security vulnerability in Fun map involving Uncontrolled Resource Consumption in fun-map under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Fun map versions are affected?
Affected versions include releases prior to current release patches across affected packages: fun-map.
What version fixes CVE-2020-7644?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is fun-map affected?
Yes, fun-map 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-2020-7644?
CVE-2020-7644 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-7644?
CVE-2020-7644 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-2020-7644?
Run the dependency tree command: 'npm ls fun-map'. 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-p33m-7w7f-gmj8",
  "modified" : "2021-07-29T16:41:29Z",
  "published" : "2021-12-10T20:05:07Z",
  "aliases" : [ "CVE-2020-7644" ],
  "summary" : "Uncontrolled Resource Consumption in fun-map",
  "details" : "fun-map through 3.3.1 is vulnerable to Prototype Pollution. The function assocInM could be tricked into adding or modifying properties of 'Object.prototype' using a '__proto__' payload.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "fun-map"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "3.3.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7644"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nathan7/fun-map/blob/master/index.js#L137,"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-FUNMAP-564436"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321", "CWE-915" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-25T20:37:47Z",
    "nvd_published_at" : "2020-04-28T19:15:00Z"
  }
}