CVE-2024-53406
📋 TL;DR
CVE-2024-53406 is an authentication bypass vulnerability in Espressif ESP-IDF v5.3.0 where the device reuses session keys during reconnection, allowing attackers to bypass authentication mechanisms. This affects IoT devices using ESP-IDF v5.3.0 for Bluetooth Low Energy (BLE) connections, potentially compromising device security and data integrity.
💻 Affected Systems
- Espressif ESP-IDF
📦 What is this software?
Esp Idf by Espressif
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing unauthorized access to sensitive data, manipulation of device functionality, and potential lateral movement within IoT networks.
Likely Case
Unauthorized access to device interfaces and data, potential for data exfiltration or manipulation of device operations.
If Mitigated
Limited impact with proper network segmentation and monitoring, though authentication bypass remains possible.
🎯 Exploit Status
Proof of concept available on GitHub demonstrates the session key reuse attack. Exploitation requires proximity for BLE communication and knowledge of previous session keys.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v5.3.1 or later
Vendor Advisory: https://github.com/espressif/esp-idf
Restart Required: Yes
Instructions:
1. Update ESP-IDF to version 5.3.1 or later. 2. Recompile and flash affected devices with the updated firmware. 3. Verify the patch by testing BLE reconnection security.
🔧 Temporary Workarounds
Disable BLE Reconnection
allPrevent BLE reconnection to avoid session key reuse vulnerability
Modify BLE configuration to disable automatic reconnection features
Implement Additional Authentication
allAdd secondary authentication layer for BLE connections
Implement application-level authentication checks for all BLE operations
🧯 If You Can't Patch
- Segment IoT devices on isolated network VLANs to limit attack surface
- Implement strict access controls and monitoring for BLE communication channels
🔍 How to Verify
Check if Vulnerable:
Check ESP-IDF version: if using v5.3.0 with BLE enabled, the system is vulnerable. Review BLE reconnection implementation for session key reuse.Check Version:
idf.py --versionVerify Fix Applied:
Update to ESP-IDF v5.3.1+, test BLE reconnection to ensure new session keys are generated for each connection.📡 Detection & Monitoring
Log Indicators:
- Multiple BLE reconnection attempts from same device
- Unauthorized BLE connection establishment
- Session key reuse patterns in BLE logs
Network Indicators:
- Unusual BLE traffic patterns
- Repeated connection attempts to IoT devices
- BLE authentication bypass attempts
SIEM Query:
source="ble_logs" AND (event="reconnection" OR event="auth_bypass")