CVE-2021-25941: Deep override Prototype Pollution Vulnerability

CRITICAL
Advisory Identifier: GHSA-v659-54cx-g4qr
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CVSS 9.8
CWE-1321
Published
Advisory Summary

CVE-2021-25941 is a CRITICAL (CVSS 9.8) prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Deep override libraries in the npm ecosystem. The issue involves prototype pollution in deep-override. Remediation is available by upgrading affected packages to version 1.0.2.

CVE-2021-25941 at a Glance

CVE Identifier CVE-2021-25941
GHSA Identifier GHSA-v659-54cx-g4qr
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Deep override
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-2021-25941

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

deep-override fixed: 1.0.2 
npm install deep-override@1.0.2
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 deep-override

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-25941, inspect your project dependencies using npm:

npm ls deep-override

Analyze the terminal output to locate any version of Deep override in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.2), your application is affected.

Note: The npm ls deep-override 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 Deep override, 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

Prototype pollution vulnerability in 'deep-override' versions 1.0.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.

CVE-2021-25941 Affected Deep override Versions

1 component(s)
Fixed Versions:
1.0.2
Product / Package Ecosystem Affected Versions Fixed Version
deep-override
npm/deep-override
npm
≥ 1.0.0
< 1.0.2
1.0.2

References

www.whitesourcesoftware.com/vulnerability-datab... WEB
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25941
NVD — CVE-2021-25941 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-25941
Security Fix Commit FIX COMMIT
https://github.com/ASaiAnudeep/deep-override/commit/2aced17651fb684959a6e04b1465a8329b3d5268

Frequently Asked Questions

What is CVE-2021-25941?
CVE-2021-25941 is a security vulnerability in Deep override involving Prototype Pollution in deep-override under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Deep override versions are affected?
Affected versions include releases prior to 1.0.2 across affected packages: deep-override.
What version fixes CVE-2021-25941?
Upgrading to 1.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is deep-override affected?
Yes, deep-override is affected in releases prior to 1.0.2. Upgrade your dependency to 1.0.2 or later.
What is the CVSS score of CVE-2021-25941?
CVE-2021-25941 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-2021-25941?
CVE-2021-25941 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-2021-25941?
Run the dependency tree command: 'npm ls deep-override'. 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-v659-54cx-g4qr",
  "modified" : "2021-05-25T20:44:52Z",
  "published" : "2021-05-17T20:57:25Z",
  "aliases" : [ "CVE-2021-25941" ],
  "summary" : "Prototype Pollution in deep-override",
  "details" : "Prototype pollution vulnerability in 'deep-override' versions 1.0.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote 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" : "deep-override"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-25941"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ASaiAnudeep/deep-override/commit/2aced17651fb684959a6e04b1465a8329b3d5268"
  }, {
    "type" : "WEB",
    "url" : "https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25941"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-17T17:59:32Z",
    "nvd_published_at" : "2021-05-14T14:15:00Z"
  }
}