Vulnerabilities in pkg:npm/mockjs

PACKAGE
Advisory Identifier: GHSA-mh8j-9jvh-gjf6
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Advisory Summary

CVE-2023-26158 is a HIGH (CVSS 8.2) mockjs vulnerable to prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Mockjs libraries in the npm ecosystem. The issue involves mockjs vulnerable to prototype pollution via the util.extend function. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/mockjs

1 Known Advisory Record(s)

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

Advisory ID CVE / NVD Severity Summary
GHSA-mh8j-9jvh-gjf6 CVE-2023-26158 HIGH mockjs vulnerable to Prototype Pollution via the Util.extend function

CVE-2023-26158 at a Glance

CVE Identifier CVE-2023-26158
GHSA Identifier GHSA-mh8j-9jvh-gjf6
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Mockjs
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 8.2

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:N/I:L/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 None (C:N)
Integrity Low (I:L)
Availability High (A:H)

How to Fix CVE-2023-26158

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

mockjs fixed: Latest secure release 
npm install mockjs@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 mockjs

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2023-26158, inspect your project dependencies using npm:

npm ls mockjs

Analyze the terminal output to locate any version of Mockjs 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 mockjs 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 Mockjs, 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 the package mockjs are vulnerable to Prototype Pollution via the Util.extend function due to missing check if the attribute resolves to the object prototype. By adding or modifying attributes of an object prototype, it is possible to create attributes that exist on every object, or replace critical attributes with malicious ones. This can be problematic if the software depends on existence or non-existence of certain attributes, or uses pre-defined attributes of object prototype (such as hasOwnProperty, toString or valueOf). User controlled inputs inside the extend() method of the Mock.Handler, Mock.Random, Mock.RE.Handler or Mock.Util, will allow an attacker to exploit this vulnerability. Workaround By using a denylist of dangerous attributes, this weakness can be eliminated. Add the following line in the Util.extend function: js js if (["__proto__", "constructor", "prototype"].includes(name)) continue js // src/mock/handler.js Util.extend = function extend() { var target = arguments[0] || {}, i = 1, length = arguments.length, options, name, src, copy, clone if (length === 1) { target = this i = 0 } for (; i < length; i++) { options = arguments[i] if (!options) continue for (name in options) { if (["__proto__", "constructor", "prototype"].includes(name)) continue src = target[name] copy = options[name] if (target === copy) continue if (copy === undefined) continue if (Util.isArray(copy) || Util.isObject(copy)) { if (Util.isArray(copy)) clone = src && Util.isArray(src) ? src : [] if (Util.isObject(copy)) clone = src && Util.isObject(src) ? src : {} target[name] = Util.extend(clone, copy) } else { target[name] = copy } } } return target }

CVE-2023-26158 Affected Mockjs Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
mockjs
npm/mockjs
npm
≤ 1.1.0

References

NVD — CVE-2023-26158 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-26158
Mockjs Source Repository REPOSITORY
https://github.com/nuysoft/Mock
Mockjs Source Repository REPOSITORY
https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js#L721-L755
Mockjs Security Information SECURITY
https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365

Frequently Asked Questions

What is CVE-2023-26158?
CVE-2023-26158 is a security vulnerability in Mockjs involving mockjs vulnerable to Prototype Pollution via the Util.extend function under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Mockjs versions are affected?
Affected versions include releases prior to current release patches across affected packages: mockjs.
What version fixes CVE-2023-26158?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is mockjs affected?
Yes, mockjs 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-2023-26158?
CVE-2023-26158 has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
What CWE is associated with CVE-2023-26158?
CVE-2023-26158 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-2023-26158?
Run the dependency tree command: 'npm ls mockjs'. 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-mh8j-9jvh-gjf6",
  "modified" : "2023-12-08T15:49:13Z",
  "published" : "2023-12-08T06:30:38Z",
  "aliases" : [ "CVE-2023-26158" ],
  "summary" : "mockjs vulnerable to Prototype Pollution via the Util.extend function",
  "details" : "All versions of the package mockjs are vulnerable to Prototype Pollution via the Util.extend function due to missing check if the attribute resolves to the object prototype. By adding or modifying attributes of an object prototype, it is possible to create attributes that exist on every object, or replace critical attributes with malicious ones. This can be problematic if the software depends on existence or non-existence of certain attributes, or uses pre-defined attributes of object prototype (such as hasOwnProperty, toString or valueOf).\n\nUser controlled inputs inside the extend() method of the Mock.Handler, Mock.Random, Mock.RE.Handler or Mock.Util, will allow an attacker to exploit this vulnerability.\n\n Workaround\n\nBy using a denylist of dangerous attributes, this weakness can be eliminated.\n\nAdd the following line in the Util.extend function:\n\njs\njs if ([\"__proto__\", \"constructor\", \"prototype\"].includes(name)) continue\n\n\njs\n// src/mock/handler.js\nUtil.extend = function extend() {\n        var target = arguments[0] || {},\n            i = 1,\n            length = arguments.length,\n            options, name, src, copy, clone\n\n        if (length === 1) {\n            target = this\n            i = 0\n        }\n\n        for (; i < length; i++) {\n            options = arguments[i]\n            if (!options) continue\n\n            for (name in options) {\n            if ([\"__proto__\", \"constructor\", \"prototype\"].includes(name)) continue\n                src = target[name]\n                copy = options[name]\n\n                if (target === copy) continue\n                if (copy === undefined) continue\n\n                if (Util.isArray(copy) || Util.isObject(copy)) {\n                    if (Util.isArray(copy)) clone = src && Util.isArray(src) ? src : []\n                    if (Util.isObject(copy)) clone = src && Util.isObject(src) ? src : {}\n\n                    target[name] = Util.extend(clone, copy)\n                } else {\n                    target[name] = copy\n                }\n            }\n        }\n\n        return target\n    }\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "mockjs"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-26158"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/nuysoft/Mock"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js#L721-L755"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-08T15:49:13Z",
    "nvd_published_at" : "2023-12-08T05:15:07Z"
  }
}