CVE-2022-30904
📋 TL;DR
A buffer overflow vulnerability in Bestechnic Bluetooth Mesh SDK allows attackers to execute arbitrary code during device provisioning by sending specially crafted Transaction Start PDU packets. This affects devices using BES2300 Bluetooth chips with the vulnerable SDK version. Attackers within Bluetooth range can potentially compromise affected IoT devices.
💻 Affected Systems
- Devices using Bestechnic BES2300 Bluetooth chips with Bluetooth Mesh SDK
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, allowing attackers to install persistent malware, exfiltrate data, or pivot to other network devices.
Likely Case
Device crash/denial of service or limited code execution allowing data manipulation or credential theft from the affected device.
If Mitigated
If proper network segmentation and Bluetooth security controls are in place, impact limited to isolated device compromise without network lateral movement.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and knowledge of Bluetooth Mesh provisioning process. No authentication needed during provisioning phase.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later versions of Bestechnic Bluetooth Mesh SDK (specific version not specified in references)
Vendor Advisory: https://docs.google.com/document/d/1is3dYwMcRIkhjvujzi5OgnaGBsQVtlew/edit
Restart Required: Yes
Instructions:
1. Contact Bestechnic for updated SDK version. 2. Recompile firmware with patched SDK. 3. Deploy updated firmware to affected devices. 4. Verify provisioning functionality post-update.
🔧 Temporary Workarounds
Disable Bluetooth Mesh provisioning
allPrevent new device provisioning to block exploitation vector
Device-specific configuration commands to disable provisioning mode
Network segmentation
allIsolate Bluetooth Mesh devices from critical network segments
🧯 If You Can't Patch
- Physically isolate affected devices in secure areas to limit Bluetooth range
- Implement strict Bluetooth access controls and monitor for unauthorized provisioning attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and SDK used. If using Bestechnic Bluetooth Mesh SDK V1.0 with BES2300 chips, assume vulnerable.Check Version:
Device-specific command to check firmware/SDK version (varies by manufacturer)Verify Fix Applied:
Verify updated SDK version is used and test provisioning with malformed Transaction Start PDU containing invalid SegN values.📡 Detection & Monitoring
Log Indicators:
- Multiple failed provisioning attempts
- Device crashes during provisioning
- Unexpected memory access errors
Network Indicators:
- Unusual Bluetooth Mesh provisioning traffic
- Multiple Transaction Start PDU packets with large SegN values
SIEM Query:
bluetooth AND mesh AND provisioning AND (error OR crash OR overflow)