Listen to this Post
The vulnerability in node-cube arises from improper input control during object initialization. The `Cube.init` function, which merges user-provided configuration objects, fails to restrict the modification of the Object prototype. An attacker can craft a malicious payload containing properties like `__proto__` or constructor.prototype. When this payload is processed by the vulnerable function, these specially crafted properties are merged into the object without proper sanitization. This allows the attacker to pollute the prototype of base objects, potentially altering the application’s behavior. The polluted properties are then inherited by all objects in the application, which can lead to denial of service by triggering exceptions or, in worst-case scenarios, be leveraged for remote code execution if the application later uses these properties in dangerous operations like `eval` or Function.
Platform: Node.js
Version: <=5.0.0-beta.19
Vulnerability: Prototype Pollution
Severity: Low
date: 2025-09-24
Prediction: Patch expected 2025-10-08
What Undercode Say:
npm audit --audit-level moderate
const cube = require('cube');
// Malicious payload to pollute the prototype
const maliciousConfig = JSON.parse('{"<strong>proto</strong>":{"polluted":"yes"}}');
cube.init(maliciousConfig);
// Check for pollution
console.log(({}).polluted); // Outputs: 'yes'
How Exploit:
Attacker sends a specially crafted JSON object to an endpoint that uses cube.init. The payload targets the prototype chain to inject properties, potentially causing the application to crash or execute arbitrary code.
Protection from this CVE:
Upgrade package when available. Use `Object.create(null)` for safe objects. Implement input sanitization to reject keys such as `__proto__` and constructor.
Impact:
Denial of Service, potential Remote Code Execution, modification of application flow.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
