CVE-2024-54139: Combodo iTop XSS Vulnerability

CVE-2024-54139 Overview

CVE-2024-54139 is a cross-site scripting (XSS) vulnerability in Combodo iTop, an open source and web-based IT service management platform. This vulnerability exists in the _table_id parameter and can be leveraged to perform cross-site request forgery (CSRF) attacks. The flaw affects multiple versions of iTop prior to the patched releases, potentially allowing attackers to execute arbitrary scripts in the context of authenticated users and perform unauthorized actions on their behalf.

Critical Impact

This XSS-to-CSRF vulnerability chain enables attackers to execute malicious scripts and forge requests as authenticated users, potentially compromising IT service management operations, configuration data, and sensitive infrastructure information managed by iTop.

Affected Products

• Combodo iTop versions prior to 2.7.11
• Combodo iTop versions prior to 3.1.2
• Combodo iTop 3.2.0 alpha1, beta1, rc1, rc2, and rc3 (prior to 3.2.0 stable)

Discovery Timeline

• 2024-12-13 - CVE-2024-54139 published to NVD
• 2025-03-11 - Last updated in NVD database

Technical Details for CVE-2024-54139

Vulnerability Analysis

This vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation) represents a classic XSS flaw that can be chained with CSRF to amplify its impact. The _table_id parameter fails to properly sanitize user-supplied input before rendering it in the web interface, allowing attackers to inject malicious JavaScript code.

When an authenticated user visits a crafted URL or page containing the malicious payload, the injected script executes within their browser session. This execution context provides attackers with access to the user's session tokens, cookies, and the ability to perform actions on behalf of the victim—effectively bypassing CSRF protections through the XSS vector.

The network-based attack vector requires user interaction (such as clicking a malicious link), but once triggered, the vulnerability can lead to high impacts on confidentiality, integrity, and availability of the iTop system. The scope is changed, meaning the vulnerability can affect resources beyond the vulnerable component itself.

Root Cause

The root cause of CVE-2024-54139 is insufficient input validation and output encoding on the _table_id parameter. When this parameter is processed by the iTop application, user-controlled data is reflected in the HTML response without proper sanitization, enabling script injection. This lack of proper encoding allows special characters and JavaScript code to be interpreted by the browser as executable content rather than benign text.

Attack Vector

The attack requires an authenticated iTop user to interact with a malicious URL or page containing the crafted _table_id parameter value. An attacker would typically:

1. Craft a URL containing malicious JavaScript in the _table_id parameter
2. Distribute this URL through phishing emails, forum posts, or other social engineering techniques
3. When a victim clicks the link while authenticated to iTop, the malicious script executes
4. The script can then perform CSRF attacks, steal session tokens, or modify iTop configurations

The vulnerability does not require prior authentication by the attacker, but does require a legitimate user to be authenticated and interact with the malicious content. For technical implementation details, refer to the GitHub Security Advisory.

Detection Methods for CVE-2024-54139

Indicators of Compromise

• Unusual or malformed _table_id parameter values in web server logs containing JavaScript code or HTML tags
• Unexpected cross-origin requests originating from the iTop web application
• User session anomalies indicating potential session hijacking or unauthorized actions
• Browser console errors related to blocked scripts or CSP violations from iTop pages

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect XSS patterns in the _table_id parameter
• Monitor web server access logs for requests containing suspicious encoded characters, script tags, or event handlers in URL parameters
• Deploy Content Security Policy (CSP) headers to detect and prevent inline script execution
• Utilize browser-based security tools to identify reflected content in page responses

Monitoring Recommendations

• Enable detailed logging on the iTop web application to capture all parameter values in requests
• Set up alerting for unusual patterns of administrative actions that may indicate CSRF exploitation
• Monitor for new or modified user accounts and configuration changes that were not authorized through normal workflows
• Review authentication logs for session anomalies following potential XSS exploitation

How to Mitigate CVE-2024-54139

Immediate Actions Required

• Upgrade Combodo iTop to version 2.7.11, 3.1.2, or 3.2.0 (stable) immediately
• Review access logs for evidence of exploitation attempts targeting the _table_id parameter
• Implement or strengthen Content Security Policy headers to mitigate XSS impact
• Consider temporarily restricting access to the iTop application from untrusted networks until patching is complete

Patch Information

Combodo has released security patches addressing this vulnerability in iTop versions 2.7.11, 3.1.2, and 3.2.0. Organizations should upgrade to these versions or later to remediate the vulnerability. Detailed patch information and release notes are available in the GitHub Security Advisory GHSA-jmv2-wfh5-h5wg.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to filter malicious input in the _table_id parameter
• Implement strict Content Security Policy headers to prevent inline script execution and mitigate XSS attacks
• Restrict network access to the iTop application to trusted IP ranges and VPN users only
• Educate users about phishing risks and the importance of not clicking suspicious links while authenticated

# Example: Apache configuration to add CSP headers for iTop
# Add to your iTop VirtualHost or .htaccess configuration
Header always set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';"
Header always set X-Content-Type-Options "nosniff"
Header always set X-XSS-Protection "1; mode=block"