CVE-2021-23373: Set deep prop Set-deep-prop Prototype Pollution Vulnerability

CRITICAL
Advisory Identifier: GHSA-v42q-78w8-8fcc
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CVSS 9.8
CWE-1321
Published
Advisory Summary

CVE-2021-23373 is a CRITICAL (CVSS 9.8) set-deep-prop prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Set deep prop libraries in the npm ecosystem. The issue involves set-deep-prop prototype pollution. Remediation is available in the latest vendor maintenance releases.

CVE-2021-23373 at a Glance

CVE Identifier CVE-2021-23373
GHSA Identifier GHSA-v42q-78w8-8fcc
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Set deep prop
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-2021-23373

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

set-deep-prop fixed: Latest secure release 
npm install set-deep-prop@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 set-deep-prop

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-23373, inspect your project dependencies using npm:

npm ls set-deep-prop

Analyze the terminal output to locate any version of Set deep prop 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 set-deep-prop 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 Set deep prop, 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 set-deep-prop are vulnerable to Prototype Pollution via the main functionality.

CVE-2021-23373 Affected Set deep prop Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
set-deep-prop
npm/set-deep-prop
npm
≤ 1.0.0

References

NVD — CVE-2021-23373 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23373
Set deep prop Security Information SECURITY
https://security.snyk.io/vuln/SNYK-JS-SETDEEPPROP-1083231

Frequently Asked Questions

What is CVE-2021-23373?
CVE-2021-23373 is a security vulnerability in Set deep prop involving set-deep-prop Prototype Pollution under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Set deep prop versions are affected?
Affected versions include releases prior to current release patches across affected packages: set-deep-prop.
What version fixes CVE-2021-23373?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is set-deep-prop affected?
Yes, set-deep-prop 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-2021-23373?
CVE-2021-23373 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-2021-23373?
CVE-2021-23373 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-2021-23373?
Run the dependency tree command: 'npm ls set-deep-prop'. 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-v42q-78w8-8fcc",
  "modified" : "2022-08-06T09:34:51Z",
  "published" : "2022-07-26T00:01:05Z",
  "aliases" : [ "CVE-2021-23373" ],
  "summary" : "set-deep-prop Prototype Pollution",
  "details" : "All versions of package set-deep-prop are vulnerable to Prototype Pollution via the main functionality.",
  "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" : "set-deep-prop"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23373"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-JS-SETDEEPPROP-1083231"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-08-06T09:34:51Z",
    "nvd_published_at" : "2022-07-25T14:15:00Z"
  }
}