CVE-2024-5754
📋 TL;DR
This vulnerability in Zephyr RTOS Bluetooth stack allows attackers to bypass encryption procedures, potentially enabling unauthorized access to Bluetooth communications. It affects devices running vulnerable versions of Zephyr RTOS with Bluetooth functionality enabled.
💻 Affected Systems
- Zephyr RTOS
📦 What is this software?
Zephyr by Zephyrproject
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Bluetooth communications, allowing eavesdropping, data manipulation, and potential device takeover in IoT/embedded systems.
Likely Case
Unauthorized access to Bluetooth data streams, potential for man-in-the-middle attacks, and privacy violations.
If Mitigated
Limited impact with proper network segmentation and Bluetooth security controls in place.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and knowledge of vulnerable encryption procedures.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Zephyr RTOS 3.7.1 and later
Vendor Advisory: https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-gvv5-66hw-5qrc
Restart Required: Yes
Instructions:
1. Update Zephyr RTOS to version 3.7.1 or later. 2. Rebuild and redeploy firmware to affected devices. 3. Verify Bluetooth encryption procedures are properly implemented.
🔧 Temporary Workarounds
Disable Bluetooth if not required
allTemporarily disable Bluetooth functionality to eliminate attack surface
CONFIG_BT=n in project configuration
Implement additional encryption layers
allAdd application-level encryption for sensitive Bluetooth communications
🧯 If You Can't Patch
- Segment Bluetooth networks from critical infrastructure
- Implement physical security controls to limit Bluetooth proximity access
🔍 How to Verify
Check if Vulnerable:
Check Zephyr RTOS version and verify if Bluetooth is enabled with vulnerable encryption proceduresCheck Version:
Check Zephyr version in build configuration or via device firmware version queryVerify Fix Applied:
Confirm Zephyr RTOS version is 3.7.1 or later and test Bluetooth encryption functionality📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth pairing attempts
- Encryption procedure failures
- Unexpected Bluetooth connection requests
Network Indicators:
- Anomalous Bluetooth traffic patterns
- Unauthorized Bluetooth device connections
SIEM Query:
Bluetooth AND (encryption_failure OR unauthorized_pairing)