CVE-2023-26158

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 }
Configurations

Configuration 1 (hide)

cpe:2.3:a:mockjs:mock.js:*:*:*:*:*:node.js:*:*

History

12 Dec 2023, 22:26

Type Values Removed Values Added
CPE cpe:2.3:a:mockjs:mock.js:*:*:*:*:*:node.js:*:*
CVSS v2 : unknown
v3 : unknown
v2 : unknown
v3 : 8.2
References () https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js%23L721-L755 - () https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js%23L721-L755 - Broken Link
References () https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365 - () https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365 - Exploit, Mitigation, Third Party Advisory
First Time Mockjs
Mockjs mock.js
CWE CWE-1321

08 Dec 2023, 05:15

Type Values Removed Values Added
New CVE

Information

Published : 2023-12-08 05:15

Updated : 2024-02-28 20:54


NVD link : CVE-2023-26158

Mitre link : CVE-2023-26158

CVE.ORG link : CVE-2023-26158


JSON object : View

Products Affected

mockjs

  • mock.js
CWE
CWE-1321

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')