CVE-2023-26158 (GCVE-0-2023-26158)
Vulnerability from cvelistv5
Published
2023-12-08 05:00
Modified
2024-08-02 11:39
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1321 - Prototype Pollution
Summary
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
}
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-02T11:39:06.604Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js%23L721-L755"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "mockjs",
"vendor": "n/a",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Timothee Desurmont"
}
],
"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 \u003c 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 \u0026\u0026 Util.isArray(src) ? src : []\r if (Util.isObject(copy)) clone = src \u0026\u0026 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"
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H/E:P",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1321",
"description": "Prototype Pollution",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-12-08T05:00:01.350Z",
"orgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730",
"shortName": "snyk"
},
"references": [
{
"url": "https://security.snyk.io/vuln/SNYK-JS-MOCKJS-6051365"
},
{
"url": "https://github.com/nuysoft/Mock/blob/00ce04b92eb464e664a4438430903f2de96efb47/dist/mock.js%23L721-L755"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730",
"assignerShortName": "snyk",
"cveId": "CVE-2023-26158",
"datePublished": "2023-12-08T05:00:01.350Z",
"dateReserved": "2023-02-20T10:28:48.930Z",
"dateUpdated": "2024-08-02T11:39:06.604Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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