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

Listen to this Post

🐢▶️ Listen🚀

How the CVE Works:

The CVE-2025-XXXX vulnerability in PrismJS (versions through 1.29.0) involves DOM Clobbering, a technique where attacker-controlled HTML elements interfere with JavaScript code. Specifically, the `document.currentScript` property, which is used to reference the currently executing script, can be overridden by malicious HTML elements injected into the DOM. This allows an attacker to manipulate the script’s behavior, potentially leading to Cross-Site Scripting (XSS) if untrusted input containing HTML is processed. The vulnerability arises because PrismJS does not properly sanitize or validate input, enabling attackers to inject elements that shadow critical JavaScript properties.

DailyCVE Form:

Platform: PrismJS

(empty line)

Version: 1.29.0 and earlier

(empty line)

Vulnerability: DOM Clobbering

(empty line)

Severity: Moderate

(empty line)

Date: Mar 3, 2025

What Undercode Say:

Exploitation:

1. Exploit Code Example:

<div id="currentScript"></div>

<script>
// Malicious payload to override document.currentScript
document.getElementById('currentScript').innerHTML = '<script>alert("XSS")</script>';
</script>

2. Exploit Command:

• Inject the above HTML into a vulnerable application using PrismJS.

3. Exploit URL:

• Host the malicious payload on a server and trick users into visiting the URL.

Protection:

1. Sanitization:

• Use libraries like DOMPurify to sanitize untrusted HTML input.

  const cleanHTML = DOMPurify.sanitize(untrustedHTML);
  

2. Input Validation:

• Validate and escape all user inputs before processing.

  function escapeHTML(str) {
  return str.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
  }
  

3. Update PrismJS:

• Upgrade to the latest version of PrismJS if a patch is available.

4. 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]

5. Testing:

• Use tools like OWASP ZAP or Burp Suite to test for DOM Clobbering vulnerabilities.

6. References:

• GitHub Advisory
• NVD Entry
• DOMPurify Documentation

7. Monitoring:

• Regularly monitor for updates and security advisories related to PrismJS.

8. Code Review:

• Conduct thorough code reviews to identify and mitigate DOM Clobbering risks.

9. Browser Console Debugging:

• Use browser developer tools to inspect and debug DOM manipulations.

10. Community Resources:

• Engage with the PrismJS community for support and best practices.

References:

Reported By: https://github.com/advisories/GHSA-x7hr-w5r2-h6wg
Extra Source Hub:
Undercode

Image Source:

Undercode AI DI v2