CVE-2024-30875: jQuery UI v.1.13.1 XSS Vulnerability

CVE-2024-30875 Overview

A Cross-Site Scripting (XSS) vulnerability has been identified in the JavaScript Library jquery-ui version 1.13.1. This vulnerability potentially allows a remote attacker to obtain sensitive information and execute arbitrary code via a crafted payload targeting the window.addEventListener component.

Important Note: This vulnerability is disputed by the jQuery UI maintainers. The supplier states that it cannot be reproduced, and the provided exploitation example does not clearly indicate whether or how the example website is actually using jQuery UI. Organizations should evaluate this vulnerability in the context of their specific jQuery UI implementation.

Critical Impact

If valid, attackers could potentially steal sensitive user data, hijack user sessions, or execute malicious scripts in victims' browsers through crafted XSS payloads targeting jQuery UI implementations.

Affected Products

• jQuery UI v.1.13.1
• Web applications utilizing the affected jQuery UI version
• Systems implementing window.addEventListener with jQuery UI components

Discovery Timeline

• October 17, 2024 - CVE-2024-30875 published to NVD
• October 25, 2024 - Last updated in NVD database

Technical Details for CVE-2024-30875

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The reported issue allegedly involves improper handling of user-supplied input within the window.addEventListener component when used in conjunction with jQuery UI.

Cross-Site Scripting vulnerabilities occur when an application includes untrusted data in a web page without proper validation or escaping, allowing attackers to execute scripts in the victim's browser. In this case, the alleged vulnerability would enable an attacker to inject and execute malicious JavaScript code within the context of an affected web application.

However, it is critical to note that this CVE is disputed by the jQuery UI maintainers. The dispute centers on reproducibility concerns and unclear exploitation methodology in the proof-of-concept.

Root Cause

The alleged root cause involves insufficient input sanitization within the event handling mechanisms when jQuery UI interacts with window.addEventListener. If valid, the vulnerability would stem from improper validation of data passed through event listeners, potentially allowing malicious payloads to be interpreted as executable code.

Given the disputed status, organizations should conduct their own testing to determine if their specific jQuery UI implementation is vulnerable.

Attack Vector

The attack requires network access and user interaction. An attacker would need to craft a malicious payload and deliver it to victims, typically through:

• Phishing links containing XSS payloads
• Malicious advertisements or iframes
• Compromised web content that targets jQuery UI event handlers

The vulnerability, if exploitable, could affect the confidentiality, integrity, and availability of the targeted web application, potentially allowing data theft, session hijacking, or defacement.

A proof-of-concept repository has been published. See the GitHub PoC Repository for technical details regarding the alleged exploitation methodology.

Detection Methods for CVE-2024-30875

Indicators of Compromise

• Unusual JavaScript payloads in URL parameters or form inputs targeting jQuery UI components
• Suspicious event listener registrations containing encoded or obfuscated JavaScript
• Unexpected outbound connections from client browsers following interaction with jQuery UI elements
• Error logs showing malformed input to window.addEventListener contexts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect XSS patterns in requests targeting jQuery UI endpoints
• Enable Content Security Policy (CSP) headers to restrict script execution sources
• Monitor for anomalous JavaScript execution patterns in browser developer tools or security monitoring solutions
• Review application logs for suspicious input patterns that may indicate XSS attempts

Monitoring Recommendations

• Deploy client-side JavaScript monitoring to detect unauthorized script execution
• Implement logging for all user input processed by jQuery UI components
• Monitor network traffic for data exfiltration patterns following user interactions
• Set up alerts for CSP violation reports indicating blocked inline script attempts

How to Mitigate CVE-2024-30875

Immediate Actions Required

• Audit your jQuery UI implementation to determine if your usage pattern matches the alleged vulnerability scenario
• Review the GitHub PoC Repository to understand the claimed attack methodology
• Implement Content Security Policy (CSP) headers to restrict inline script execution
• Apply input validation and output encoding for all user-supplied data processed by jQuery UI

Patch Information

As of the last update (October 25, 2024), no official patch has been released. The vulnerability remains disputed by the jQuery UI maintainers who report being unable to reproduce the issue. Organizations should:

1. Monitor the official jQuery UI repository for updates
2. Evaluate whether upgrading to a newer jQuery UI version (if available) addresses your security concerns
3. Consider the disputed status when prioritizing remediation efforts

Workarounds

• Implement strict Content Security Policy (CSP) headers with script-src directives to prevent inline script execution
• Apply comprehensive input validation and sanitization for all data passed to jQuery UI components
• Use output encoding when rendering user-supplied content within jQuery UI elements
• Consider implementing Subresource Integrity (SRI) for jQuery UI library files to prevent tampering

# Example CSP header configuration for Apache
# Add to .htaccess or httpd.conf
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'"

# Example CSP header for Nginx
# Add to server block
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'";