CVE-2021-37050
📋 TL;DR
This CVE describes a missing sensitive data encryption vulnerability in Huawei smartphones running HarmonyOS. Attackers could potentially access unencrypted sensitive data stored on affected devices, compromising service confidentiality. The vulnerability affects Huawei smartphone users with unpatched devices.
💻 Affected Systems
- Huawei Smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized access to sensitive user data stored on the device, potentially including personal information, authentication tokens, or other confidential service data.
Likely Case
Local attackers with physical access or malware could extract unencrypted sensitive data from vulnerable devices.
If Mitigated
With proper encryption controls and patching, sensitive data remains protected even if other vulnerabilities exist.
🎯 Exploit Status
Exploitation likely requires local access to the device or malware installation. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: September 2021 security update for HarmonyOS
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/9/
Restart Required: Yes
Instructions:
1. Navigate to Settings > System & updates > Software update on your Huawei device. 2. Check for available updates. 3. Install the September 2021 security update or later. 4. Restart the device after installation.
🔧 Temporary Workarounds
Enable device encryption
allEnsure device encryption is enabled to protect data at rest
Restrict app permissions
allReview and restrict app permissions to minimize potential data exposure
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement mobile device management (MDM) controls to restrict data access
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS version. If version is prior to September 2021 security update, device is vulnerable.Check Version:
Settings > About phone > HarmonyOS versionVerify Fix Applied:
Verify HarmonyOS version is September 2021 security update or later in Settings > About phone > HarmonyOS version.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns to sensitive data directories
- Multiple failed encryption/decryption attempts
Network Indicators:
- Unusual data exfiltration from mobile devices
SIEM Query:
Look for patterns of unauthorized access to sensitive data storage locations on mobile devices🔗 References
- https://consumer.huawei.com/en/support/bulletin/2021/9/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
- https://consumer.huawei.com/en/support/bulletin/2021/9/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
