CVE-2024-55532
📋 TL;DR
This vulnerability allows CSV formula injection in Apache Ranger's export feature, enabling attackers to execute arbitrary commands or exfiltrate data when exported CSV files are opened in spreadsheet applications. It affects all Apache Ranger deployments before version 2.6.0 where users can export data via CSV.
💻 Affected Systems
- Apache Ranger
📦 What is this software?
Ranger by Apache
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on client systems when malicious CSV is opened in vulnerable spreadsheet software, potentially leading to full system compromise of client machines.
Likely Case
Data exfiltration or client-side code execution when users open exported CSV files in applications like Excel or LibreOffice that automatically execute formulas.
If Mitigated
Limited impact if CSV files are only processed by applications that don't execute formulas, or if users are trained not to open untrusted CSV files in spreadsheet software.
🎯 Exploit Status
Exploitation requires authenticated access to generate CSV exports and relies on user interaction to open the malicious file. No public exploit code identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.6.0
Vendor Advisory: https://cwiki.apache.org/confluence/display/RANGER/Vulnerabilities+found+in+Ranger
Restart Required: Yes
Instructions:
1. Download Apache Ranger 2.6.0 from official Apache repository. 2. Backup current configuration and data. 3. Stop Ranger services. 4. Deploy new version. 5. Apply configuration from backup. 6. Start Ranger services. 7. Verify functionality.
🔧 Temporary Workarounds
Disable CSV Export Feature
allTemporarily disable CSV export functionality in Ranger if not critically needed
Modify Ranger configuration to remove CSV export options from UI/API
CSV Sanitization Proxy
allImplement a proxy that sanitizes CSV exports by stripping formula elements
Implement custom export handler that removes =, +, -, @ characters from CSV fields
🧯 If You Can't Patch
- Implement strict user training about the dangers of opening CSV files from untrusted sources in spreadsheet applications
- Deploy endpoint protection that blocks execution of formulas in CSV files or forces CSV files to open in text editors only
🔍 How to Verify
Check if Vulnerable:
Check Apache Ranger version via admin interface or configuration files. If version is less than 2.6.0, system is vulnerable.Check Version:
Check ranger-admin/version.txt or use Ranger API endpoint for version informationVerify Fix Applied:
After upgrade, confirm version is 2.6.0 or higher and test CSV export functionality to ensure formulas are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual CSV export patterns, multiple export requests from single user, exports containing formula characters
Network Indicators:
- Large CSV downloads from Ranger interface, unusual export API calls
SIEM Query:
source="apache-ranger" AND (event="csv_export" OR url_path="/service/export") AND user!="admin"