CVE-2024-3687: bihell Dice XSS Vulnerability

CVE-2024-3687 Overview

A Cross-Site Scripting (XSS) vulnerability has been discovered in bihell Dice version 3.1.0. The vulnerability exists within the Comment Handler component, where improper input sanitization allows attackers to inject malicious scripts that execute in the context of other users' browsers. This vulnerability can be exploited remotely by authenticated users to perform various client-side attacks.

Critical Impact

Attackers can exploit this XSS vulnerability to steal session cookies, redirect users to malicious sites, deface web content, or perform actions on behalf of authenticated users within the Dice CMS platform.

Affected Products

• bihell Dice 3.1.0

Discovery Timeline

• 2024-04-12 - CVE CVE-2024-3687 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-3687

Vulnerability Analysis

This vulnerability is classified as a Cross-Site Scripting (XSS) flaw (CWE-79) affecting the Comment Handler component of the Dice CMS. The vulnerability stems from insufficient input validation and output encoding when processing user-submitted comments. When malicious script content is submitted through the comment functionality, it is stored and subsequently rendered without proper sanitization, allowing the injected code to execute in victims' browsers.

The attack requires low privileges (an authenticated user account) and user interaction (a victim must view the page containing the malicious comment). While the integrity impact is limited to the scope of the vulnerable component, successful exploitation could lead to session hijacking, phishing attacks, or unauthorized actions performed on behalf of legitimate users.

Root Cause

The root cause of this vulnerability is inadequate input sanitization and output encoding in the Comment Handler component. When user-submitted comment data is processed, the application fails to properly escape or sanitize HTML and JavaScript content before storing it in the database and rendering it back to users. This allows specially crafted input containing script tags or JavaScript event handlers to be preserved and executed when the comment is displayed.

Attack Vector

The attack can be launched remotely over the network by any authenticated user with comment submission privileges. The attacker crafts a comment containing malicious JavaScript code and submits it through the normal comment functionality. When other users (including administrators) view the page containing the malicious comment, the injected script executes in their browser context.

The exploitation process involves submitting comment content that includes HTML elements with embedded JavaScript, such as script tags or event handlers like onload, onerror, or onclick. Due to the lack of input validation, these elements are stored and rendered without modification.

For technical details and proof-of-concept information, refer to the GitHub PoC for DiceCMS XSS.

Detection Methods for CVE-2024-3687

Indicators of Compromise

• Presence of unexpected <script> tags or JavaScript event handlers in stored comment data
• Unusual encoded characters (HTML entities, URL encoding) in comment fields designed to bypass filters
• Reports from users about unexpected browser behavior or redirects when viewing comment sections
• Web application firewall logs showing blocked XSS patterns targeting comment endpoints

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in comment submissions
• Configure application logging to capture and flag suspicious comment content containing script-like patterns
• Deploy browser-based Content Security Policy (CSP) headers to mitigate XSS impact and generate violation reports
• Conduct regular security scans of the application database for stored XSS payloads

Monitoring Recommendations

• Monitor web server access logs for repeated comment submissions from single sources
• Track CSP violation reports for evidence of XSS exploitation attempts
• Implement real-time alerting for detection of script injection patterns in user input
• Review stored comment data periodically for signs of injection attacks

How to Mitigate CVE-2024-3687

Immediate Actions Required

• Upgrade bihell Dice to the latest version that addresses this vulnerability
• Implement input validation and output encoding for all user-submitted content in the Comment Handler
• Deploy Content Security Policy (CSP) headers to reduce XSS impact
• Review existing stored comments for malicious content and sanitize or remove compromised entries

Patch Information

No official vendor patch information is currently available in the CVE data. Users should monitor the bihell Dice project for security updates. For additional context and tracking information, refer to VulDB #260474.

Workarounds

• Disable or restrict the comment functionality until a patch is available
• Implement server-side input validation to strip HTML tags and JavaScript from comment submissions
• Deploy a WAF with XSS protection rules in front of the Dice CMS application
• Implement strict Content Security Policy headers to prevent inline script execution

# Example Content Security Policy 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'; img-src 'self' data:; frame-ancestors 'none';"