Stagejs, DOM Clobbering Vulnerability, CVE-2025-XXXX (Moderate)

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How the Mentioned CVE Works:

The CVE-2025-XXXX vulnerability in Stage.js (versions through 0.8.10) involves DOM Clobbering, a technique where attackers inject malicious HTML elements into a web page to override critical JavaScript objects or properties. In this case, the `document.currentScript` property, which is used to reference the currently executing script, can be shadowed by attacker-controlled HTML elements. This allows an attacker to manipulate the DOM in a way that leads to Cross-Site Scripting (XSS) when untrusted input containing HTML is processed. Since `document.currentScript` is often used to determine the script’s source or context, its clobbering can disrupt the application’s logic and enable XSS attacks without requiring direct JavaScript injection.

DailyCVE Form:

Platform: Stage.js

Version: 0.8.10 and earlier

Vulnerability: DOM Clobbering leading to XSS

Severity: Moderate

Date: Mar 3, 2025

What Undercode Say:

Exploitation:

1. Exploit Code Example:

<form id="document"><input name="currentScript" type="text" /></form>

This HTML snippet clobbers document.currentScript, allowing attackers to manipulate the DOM.

2. Payload Delivery:

• Inject the payload via user-generated content, such as comments or profile fields.
• Use reflected or stored XSS techniques to execute malicious scripts.

3. Testing for Vulnerability:

console.log(document.currentScript); // Check if it returns null or unexpected values.

Protection:

1. Sanitization:

• Use libraries like DOMPurify to sanitize user inputs.

  import DOMPurify from 'dompurify';
  const cleanHTML = DOMPurify.sanitize(userInput);
  

2. Avoid Reliance on `document.currentScript`:

• Replace `document.currentScript` with safer alternatives like `import.meta.url` in modern JavaScript.

3. Content Security Policy (CSP):

• Implement a strict CSP to mitigate XSS risks.
  [http]
  Content-Security-Policy: default-src ‘self’; script-src ‘self’; object-src ‘none’;
  [/http]

4. Update Stage.js:

• Upgrade to the latest version of Stage.js if a patch is released.

5. Input Validation:

• Validate and escape all user inputs to prevent HTML injection.

  const escapeHTML = (str) => str.replace(/[&<>"']/g, (tag) => ({ '&': '&', '<': '<', '>': '>', '"': '"', "'": '&39;' }[tag]));
  

References:

• GitHub Advisory Database
• NVD Entry for CVE-2025-XXXX
• DOMPurify Documentation
• Content Security Policy (CSP) Reference

References:

Reported By: https://github.com/advisories/GHSA-fp3m-g5rc-4c28
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