CVE-2022-24893
📋 TL;DR
A memory corruption vulnerability in ESP-IDF's Bluetooth Mesh SDK allows attackers to trigger memory corruption during device provisioning by manipulating the SegN field in Transaction Start PDUs. This affects all users of ESP-BLE-MESH component in ESP-IDF and can potentially lead to remote code execution and full system compromise.
💻 Affected Systems
- ESP-IDF with ESP-BLE-MESH component
📦 What is this software?
Esp Idf by Espressif
Esp Idf by Espressif
Esp Idf by Espressif
Esp Idf by Espressif
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full control of the device, executes arbitrary code, and potentially compromises the entire Bluetooth mesh network.
Likely Case
Memory corruption leading to device crashes, denial of service, or limited code execution within the Bluetooth mesh stack context.
If Mitigated
With proper network segmentation and Bluetooth security controls, impact limited to isolated mesh segments.
🎯 Exploit Status
Exploitation requires Bluetooth mesh network access during provisioning, but no authentication needed for the vulnerable packet processing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in ESP-IDF branches 4.1, 4.2, 4.3, 4.4
Vendor Advisory: https://github.com/espressif/esp-idf/security/advisories/GHSA-7f7f-jj2q-28wm
Restart Required: Yes
Instructions:
1. Update ESP-IDF to latest patched version from official repository. 2. Rebuild and flash firmware to all affected devices. 3. Verify new firmware is running on all mesh nodes.
🔧 Temporary Workarounds
No workaround available
allVendor states no application-layer workaround exists. Must patch firmware.
🧯 If You Can't Patch
- Isolate Bluetooth mesh network from other critical networks
- Disable provisioning of new devices until patching possible
🔍 How to Verify
Check if Vulnerable:
Check ESP-IDF version and ESP-BLE-MESH component version. If using unpatched versions before fixes in branches 4.1-4.4, system is vulnerable.Check Version:
Check ESP-IDF version in sdkconfig or via idf.py --versionVerify Fix Applied:
Verify ESP-IDF version includes commits from the security advisory and test provisioning functionality.📡 Detection & Monitoring
Log Indicators:
- Bluetooth mesh provisioning failures
- Memory corruption errors in ESP32 logs
- Device crashes during provisioning
Network Indicators:
- Unusual Bluetooth mesh provisioning traffic
- Malformed Transaction Start PDUs with manipulated SegN field
SIEM Query:
Bluetooth mesh provisioning events with error codes or device reboot patterns