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CVE-2023-26158

Estado: ModificadaAlta (8.2)—

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.

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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

Detalles técnicos trazas, registros y código del informe original
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
    }

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Mockjs — Mock.js

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2023-26158",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "report@snyk.io",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.2,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.2,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "report@snyk.io",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "mockjs",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "*",
              "versionType": "semver"
            }
          ]
        }
      ]
    }
  ],
  "published": "2023-12-08T05:15:07.870",
  "references": [
    {
      "url": "https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js%23L721-L755",
      "tags": [
        "Broken Link"
      ],
      "source": "report@snyk.io"
    },
    {
      "url": "https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365",
      "tags": [
        "Exploit",
        "Mitigation",
        "Third Party Advisory"
      ],
      "source": "report@snyk.io"
    },
    {
      "url": "https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js%23L721-L755",
      "tags": [
        "Broken Link"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365",
      "tags": [
        "Exploit",
        "Mitigation",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "report@snyk.io",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1321"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1321"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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).\r\rUser 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.\r\r Workaround\r\rBy using a denylist of dangerous attributes, this weakness can be eliminated.\r\rAdd the following line in the Util.extend function:\r\rjs\rjs if ([\"__proto__\", \"constructor\", \"prototype\"].includes(name)) continue\r\r\rjs\r// src/mock/handler.js\rUtil.extend = function extend() {\r        var target = arguments[0] || {},\r            i = 1,\r            length = arguments.length,\r            options, name, src, copy, clone\r\r        if (length === 1) {\r            target = this\r            i = 0\r        }\r\r        for (; i < length; i++) {\r            options = arguments[i]\r            if (!options) continue\r\r            for (name in options) {\r            if ([\"__proto__\", \"constructor\", \"prototype\"].includes(name)) continue\r                src = target[name]\r                copy = options[name]\r\r                if (target === copy) continue\r                if (copy === undefined) continue\r\r                if (Util.isArray(copy) || Util.isObject(copy)) {\r                    if (Util.isArray(copy)) clone = src && Util.isArray(src) ? src : []\r                    if (Util.isObject(copy)) clone = src && Util.isObject(src) ? src : {}\r\r                    target[name] = Util.extend(clone, copy)\r                } else {\r                    target[name] = copy\r                }\r            }\r        }\r\r        return target\r    }\r"
    },
    {
      "lang": "es",
      "value": "Todas las versiones del paquete mockjs son vulnerables a Prototype Pollution a través de la función Util.extend debido a que falta verificar si el atributo se resuelve en el prototipo del objeto. Al agregar o modificar atributos de un prototipo de objeto, es posible crear atributos que existen en cada objeto o reemplazar atributos críticos por otros maliciosos. Esto puede resultar problemático si el software depende de la existencia o no de ciertos atributos, o utiliza atributos predefinidos del prototipo de objeto (como hasOwnProperty, toString o valueOf). Las entradas controladas por el usuario dentro del método extend() de Mock.Handler, Mock.Random, Mock.RE.Handler o Mock.Util permitirán a un atacante explotar esta vulnerabilidad. Como workaround al utilizar una lista de atributos peligrosos, se puede eliminar esta debilidad. Agregue la siguiente línea en la función Util.extend: 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 &lt; 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 &amp;&amp; Util.isArray(src) ? src : [] if (Util.isObject(copy)) clone = src &amp;&amp; Util.isObject(src) ? src : {} target[name] = Util.extend(clone, copy) } else { target[name] = copy } } } return target } "
    }
  ],
  "lastModified": "2026-06-17T05:42:48.550",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mockjs:mock.js:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "557CBFB9-9781-4F55-8E18-A318EF1AF35F",
              "versionEndIncluding": "1.1.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "report@snyk.io"
}