CVE-2023-39373
📋 TL;DR
This CVE describes an authentication bypass vulnerability in a 2017 Hyundai vehicle model where attackers can capture and replay legitimate authentication signals. This allows unauthorized access to vehicle systems, affecting owners of the specific vehicle model.
💻 Affected Systems
- Hyundai vehicle (specific 2017 model)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete vehicle takeover including remote start/stop, door lock/unlock, and potential safety system manipulation while vehicle is in motion.
Likely Case
Unauthorized access to vehicle functions like door locks, trunk access, and remote start capabilities.
If Mitigated
Limited to non-critical functions if proper network segmentation and authentication controls are implemented.
🎯 Exploit Status
Exploitation requires physical proximity to capture signals but uses well-known capture-replay techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://www.gov.il/en/Departments/faq/cve_advisories
Restart Required: No
Instructions:
Contact Hyundai dealership for potential firmware updates or hardware modifications. No self-patching available.
🔧 Temporary Workarounds
Signal blocking pouch
allStore key fob in Faraday cage pouch to prevent signal capture
Disable keyless entry
allManually disable keyless entry features through vehicle settings if available
🧯 If You Can't Patch
- Use traditional key entry instead of keyless entry
- Park vehicle in secure, signal-blocked garage when not in use
🔍 How to Verify
Check if Vulnerable:
Check vehicle VIN and model year against manufacturer advisoriesCheck Version:
No command available - requires dealership diagnostic toolsVerify Fix Applied:
Contact Hyundai dealership for vulnerability assessment and potential fixes📡 Detection & Monitoring
Log Indicators:
- Multiple rapid authentication attempts
- Unusual time-of-day access patterns
Network Indicators:
- RF signal capture devices in proximity
- Repeated authentication signal patterns
SIEM Query:
Not applicable - vehicle system logs not typically integrated with enterprise SIEM