CVE-2017-1000039
📋 TL;DR
CVE-2017-1000039 is a formula injection vulnerability in Framadate's CSV export feature that allows attackers to inject malicious formulas into exported spreadsheets. When victims open these CSV files in spreadsheet applications like Excel, the formulas can execute, potentially leading to information disclosure or remote code execution. This affects all users of Framadate version 1.0 who export poll results.
💻 Affected Systems
- Framadate
📦 What is this software?
Framadate by Framasoft
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on victim's machine when they open a malicious CSV file in a vulnerable spreadsheet application, potentially leading to full system compromise.
Likely Case
Information disclosure through formula execution that can access local files or system information from the victim's machine.
If Mitigated
Limited impact if users open CSV files in text editors instead of spreadsheet applications, or if spreadsheet applications have security features enabled.
🎯 Exploit Status
Exploitation requires social engineering to get victims to open malicious CSV files in vulnerable spreadsheet applications.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.0
Vendor Advisory: https://framagit.org/framasoft/framadate/issues/220
Restart Required: No
Instructions:
1. Upgrade Framadate to version 1.1 or later. 2. Apply the patch that sanitizes CSV export output. 3. Verify the fix by testing CSV export functionality.
🔧 Temporary Workarounds
Disable CSV Export
allTemporarily disable CSV export functionality in Framadate configuration
Edit Framadate configuration to remove CSV export options
User Education
allEducate users to open CSV files in text editors only, not spreadsheet applications
🧯 If You Can't Patch
- Implement strict input validation on all poll data submissions
- Use web application firewall rules to block suspicious CSV export requests
🔍 How to Verify
Check if Vulnerable:
Test CSV export functionality by creating a poll with formula injection payloads like =HYPERLINK() or =WEBSERVICE() and checking if they appear unsanitized in exported CSV.Check Version:
Check Framadate version in admin panel or configuration filesVerify Fix Applied:
After patching, repeat the vulnerability test and confirm that formulas are properly escaped or removed from CSV output.📡 Detection & Monitoring
Log Indicators:
- Unusual CSV export requests
- Large number of CSV downloads from single IP
Network Indicators:
- CSV files with formula patterns in HTTP responses
SIEM Query:
source="framadate_logs" AND (event="csv_export" OR url_path="*export*csv*")