CVE-2021-40014
📋 TL;DR
CVE-2021-40014 is a heap overflow vulnerability in the bone voice ID trusted application (TA) on Huawei devices running HarmonyOS. This vulnerability could allow attackers to execute arbitrary code or access sensitive data in the trusted execution environment. Affected systems include Huawei smartphones and tablets running vulnerable versions of HarmonyOS.
💻 Affected Systems
- Huawei smartphones
- Huawei tablets
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the trusted execution environment, allowing attackers to bypass security mechanisms, access biometric data, and potentially gain persistent device control.
Likely Case
Data confidentiality breach where attackers could access sensitive voice ID data stored in the trusted application memory.
If Mitigated
Limited impact with proper security controls, potentially resulting in application crash or denial of service within the trusted environment.
🎯 Exploit Status
Exploitation requires bypassing TEE security mechanisms and understanding the specific heap overflow conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2023 security updates for HarmonyOS
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2023/7/
Restart Required: Yes
Instructions:
1. Navigate to Settings > System & updates > Software update. 2. Check for updates. 3. Install the July 2023 security update. 4. Restart the device when prompted.
🔧 Temporary Workarounds
Disable Voice ID feature
allTemporarily disable the bone voice ID functionality to reduce attack surface
🧯 If You Can't Patch
- Restrict physical access to devices and implement strong device management policies
- Monitor for suspicious application behavior and implement application whitelisting
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS version. If version is prior to July 2023 security updates, device is vulnerable.Check Version:
Not applicable - check through device settings interfaceVerify Fix Applied:
Verify HarmonyOS version includes July 2023 security updates in Settings > About phone > HarmonyOS version.📡 Detection & Monitoring
Log Indicators:
- Trusted application crashes
- TEE security violations
- Unexpected voice ID service restarts
Network Indicators:
- No network indicators - local vulnerability only
SIEM Query:
Not applicable - local device vulnerability🔗 References
- https://consumer.huawei.com/en/support/bulletin/2023/7/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202201-0000001238736331
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202307-0000001587168858
- https://consumer.huawei.com/en/support/bulletin/2023/7/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202201-0000001238736331
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202307-0000001587168858
