CVE-2022-1041
📋 TL;DR
This vulnerability allows an attacker to write data beyond the intended memory buffer during Bluetooth mesh provisioning in Zephyr, potentially leading to remote code execution or denial of service. It affects systems using the Zephyr Bluetooth mesh stack for IoT and embedded devices.
💻 Affected Systems
- Zephyr RTOS Bluetooth mesh stack
📦 What is this software?
Zephyr by Zephyrproject
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full device compromise or persistent malware installation.
Likely Case
Denial of service causing device crashes or instability in Bluetooth mesh networks.
If Mitigated
Limited impact if network segmentation and access controls prevent unauthorized provisioning attempts.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and knowledge of provisioning process; no public proof-of-concept has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Zephyr v3.1.0 and later
Vendor Advisory: http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p449-9hv9-pj38
Restart Required: Yes
Instructions:
1. Update Zephyr to version 3.1.0 or later. 2. Recompile and flash the firmware to affected devices. 3. Restart devices to apply the patch.
🔧 Temporary Workarounds
Disable Bluetooth mesh provisioning
allTemporarily disable Bluetooth mesh provisioning features to prevent exploitation.
Modify device configuration to set CONFIG_BT_MESH_PROV=n
🧯 If You Can't Patch
- Segment Bluetooth networks to isolate vulnerable devices from untrusted sources.
- Implement strict access controls and monitoring for Bluetooth provisioning attempts.
🔍 How to Verify
Check if Vulnerable:
Check Zephyr version; if below 3.1.0 and Bluetooth mesh is enabled, the system is vulnerable.Check Version:
zephyr_version=$(grep -o 'ZEPHYR_VERSION=[0-9.]*' /path/to/config) && echo $zephyr_versionVerify Fix Applied:
Confirm Zephyr version is 3.1.0 or later and verify Bluetooth mesh functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Unexpected crashes or errors in Bluetooth mesh provisioning logs
- Failed provisioning attempts from unknown devices
Network Indicators:
- Unusual Bluetooth provisioning traffic or repeated connection attempts
SIEM Query:
Example: 'event_type:bluetooth AND action:provision AND result:failure'