CVE-2022-31364
📋 TL;DR
CVE-2022-31364 is a buffer overflow vulnerability in Cypress Bluetooth Mesh SDK that allows remote attackers to execute arbitrary code by sending specially crafted segmented packets. This affects devices using the vulnerable SDK version for Bluetooth Mesh networking. Organizations using Cypress Bluetooth Mesh SDK in IoT devices, industrial systems, or consumer electronics are at risk.
💻 Affected Systems
- Cypress Bluetooth Mesh SDK
- Devices using Cypress Bluetooth Mesh SDK
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement within Bluetooth mesh networks, and potential physical safety risks in industrial/medical applications.
Likely Case
Device crash/reboot leading to denial of service, potential data leakage from memory corruption, and limited code execution in constrained environments.
If Mitigated
Denial of service from packet rejection, no code execution if memory protections are enabled and segmentation fault handling is robust.
🎯 Exploit Status
Exploitation requires sending crafted Bluetooth mesh packets but doesn't require authentication. Buffer overflow in segmented packet handling provides code execution opportunity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Infineon/Cypress for updated SDK version
Vendor Advisory: https://www.infineon.com/
Restart Required: Yes
Instructions:
1. Contact Infineon/Cypress for updated Bluetooth Mesh SDK. 2. Update affected devices with patched firmware. 3. Recompile and redeploy applications using the SDK. 4. Restart devices to apply new firmware.
🔧 Temporary Workarounds
Segmented Packet Filtering
allImplement network filtering to drop Bluetooth mesh packets with inconsistent SegN values before they reach vulnerable devices.
Bluetooth Mesh Network Segmentation
allIsolate vulnerable devices in separate Bluetooth mesh subnetworks to limit attack propagation.
🧯 If You Can't Patch
- Implement network monitoring for abnormal Bluetooth mesh packet patterns and SegN inconsistencies
- Deploy devices in physically secured areas with limited Bluetooth range to reduce attack surface
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and SDK version. If using BSA0107_05.01.00-BX8-AMESH-08 or earlier Cypress Bluetooth Mesh SDK, assume vulnerable.Check Version:
Device-specific command to check firmware/SDK version (varies by implementation)Verify Fix Applied:
Verify updated SDK version from vendor and confirm devices are running patched firmware. Test with segmented packet transmission to ensure proper handling.📡 Detection & Monitoring
Log Indicators:
- Device crashes/reboots
- Memory corruption errors in system logs
- Abnormal Bluetooth mesh packet processing errors
Network Indicators:
- Unusual volume of segmented Bluetooth mesh packets
- Packets with inconsistent SegN values in mesh traffic
SIEM Query:
Example: 'bluetooth mesh segmented packet anomaly' OR 'device crash after mesh packet reception'