CVE-2020-4079
📋 TL;DR
This vulnerability in Combodo iTop allows authenticated users to bypass data scope filtering by directly accessing the Excel export AJAX endpoint. This enables unauthorized access to sensitive data that should be restricted based on user permissions. All iTop installations before versions 2.7.2 and 2.8.0 are affected.
💻 Affected Systems
- Combodo iTop
📦 What is this software?
Itop by Combodo
Itop by Combodo
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could exfiltrate all sensitive IT service management data including user information, service tickets, configuration items, and privileged access details.
Likely Case
Malicious or compromised users accessing data beyond their authorized scope, potentially exposing confidential business information and violating data privacy regulations.
If Mitigated
With proper access controls and monitoring, impact is limited to potential data exposure that can be detected and contained.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward via direct AJAX endpoint calls.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.7.2, 2.8.0, or 3.0.0
Vendor Advisory: https://github.com/Combodo/iTop/security/advisories/GHSA-vcv9-xp3j-7jwh
Restart Required: Yes
Instructions:
1. Backup your iTop installation and database. 2. Download and install iTop version 2.7.2, 2.8.0, or 3.0.0 from the official repository. 3. Follow the iTop upgrade documentation for your specific version path. 4. Restart the web server service.
🔧 Temporary Workarounds
Restrict AJAX endpoint access
allImplement web application firewall rules or reverse proxy configurations to block direct access to the vulnerable Excel export AJAX endpoint.
# Example for Apache mod_rewrite
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/pages/ajax.render.php\?operation=export_to_excel
RewriteRule .* - [F,L]
🧯 If You Can't Patch
- Implement strict network segmentation and access controls to limit which users can reach the iTop application.
- Enable detailed logging and monitoring for AJAX endpoint access patterns and implement alerting for suspicious export activities.
🔍 How to Verify
Check if Vulnerable:
Check iTop version via the application's about page or by examining the version.php file in the installation directory.Check Version:
grep 'ITOP_VERSION' /path/to/iTop/version.phpVerify Fix Applied:
After patching, verify the version shows 2.7.2, 2.8.0, or 3.0.0. Test that authenticated users can only export data within their authorized scope.📡 Detection & Monitoring
Log Indicators:
- Unusual volume of AJAX requests to export endpoints
- Export operations from non-privileged users accessing sensitive data scopes
- Patterns of data export outside normal business hours
Network Indicators:
- HTTP POST/GET requests to /pages/ajax.render.php with export_to_excel parameter
- Unusually large data transfers from iTop server
SIEM Query:
source="iTop" AND (uri="/pages/ajax.render.php" AND operation="export_to_excel") | stats count by src_ip, user