Vulnerabilities in pkg:npm/json8

PACKAGE
Advisory Identifier: GHSA-7h43-gx24-p529
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Advisory Summary

CVE-2020-7770 is a CRITICAL (CVSS 9.8) prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Json8 libraries in the npm ecosystem. The issue involves prototype pollution in json8. Remediation is available by upgrading affected packages to version 1.0.3.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/json8

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/json8. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-7h43-gx24-p529 CVE-2020-7770 CRITICAL Prototype pollution in json8

CVE-2020-7770 at a Glance

CVE Identifier CVE-2020-7770
GHSA Identifier GHSA-7h43-gx24-p529
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Json8
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-2020-7770

To remediate this vulnerability, upgrade all affected Json8 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

json8 fixed: 1.0.3 
npm install json8@1.0.3
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 json8

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7770, inspect your project dependencies using npm:

npm ls json8

Analyze the terminal output to locate any version of Json8 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.3), your application is affected.

Note: The npm ls json8 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 Json8, 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 json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.

CVE-2020-7770 Affected Json8 Versions

1 component(s)
Fixed Versions:
1.0.3
Product / Package Ecosystem Affected Versions Fixed Version
json8
npm/json8
npm
< 1.0.3
1.0.3

References

NVD — CVE-2020-7770 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7770
Security Fix Commit FIX COMMIT
https://github.com/sonnyp/JSON8/commit/2e890261b66cbc54ae01d0c79c71b0fd18379e7e
snyk.io/vuln/snyk-js-json8-... WEB
https://snyk.io/vuln/SNYK-JS-JSON8-1017116
www.npmjs.com/package/json8 WEB
https://www.npmjs.com/package/json8

Frequently Asked Questions

What is CVE-2020-7770?
CVE-2020-7770 is a security vulnerability in Json8 involving Prototype pollution in json8 under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Json8 versions are affected?
Affected versions include releases prior to 1.0.3 across affected packages: json8.
What version fixes CVE-2020-7770?
Upgrading to 1.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is json8 affected?
Yes, json8 is affected in releases prior to 1.0.3. Upgrade your dependency to 1.0.3 or later.
What is the CVSS score of CVE-2020-7770?
CVE-2020-7770 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-2020-7770?
CVE-2020-7770 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-2020-7770?
Run the dependency tree command: 'npm ls json8'. 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-7h43-gx24-p529",
  "modified" : "2021-04-19T22:36:51Z",
  "published" : "2021-05-10T19:17:05Z",
  "aliases" : [ "CVE-2020-7770" ],
  "summary" : "Prototype pollution in json8",
  "details" : "This affects the package json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.",
  "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" : "json8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7770"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sonnyp/JSON8/commit/2e890261b66cbc54ae01d0c79c71b0fd18379e7e"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-JSON8-1017116"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/json8"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-19T22:36:51Z",
    "nvd_published_at" : "2020-11-12T11:15:00Z"
  }
}