CVE-2021-37091
📋 TL;DR
This CVE describes a permissions, privileges, and access controls vulnerability in Huawei smartphones running HarmonyOS. Successful exploitation could allow unauthorized access to sensitive information, affecting confidentiality. Users of affected Huawei devices are at risk.
💻 Affected Systems
- Huawei smartphones running HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
An attacker could gain unauthorized access to sensitive user data stored on the device, potentially including personal information, authentication tokens, or app data.
Likely Case
Local privilege escalation allowing malicious apps to access data they shouldn't have permission to view.
If Mitigated
With proper app sandboxing and security updates, the impact is limited to isolated app data rather than system-wide compromise.
🎯 Exploit Status
Exploitation likely requires malicious app installation or physical device access. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS 2.0.0.230 and later
Vendor Advisory: https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
Restart Required: Yes
Instructions:
1. Go to Settings > System & updates > Software update. 2. Check for updates. 3. Install HarmonyOS 2.0.0.230 or later. 4. Restart device when prompted.
🔧 Temporary Workarounds
Restrict app installations
allOnly install apps from trusted sources like Huawei AppGallery
Settings > Security > Install unknown apps > Disable for all apps
Enable enhanced security features
allTurn on additional security protections in HarmonyOS
Settings > Security > More security settings > Enable all available protections
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement mobile device management (MDM) with strict app whitelisting
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS versionCheck Version:
Settings > About phone > HarmonyOS versionVerify Fix Applied:
Verify HarmonyOS version is 2.0.0.230 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual permission requests from apps
- Failed permission elevation attempts
Network Indicators:
- Unusual data exfiltration from mobile devices
SIEM Query:
Look for HarmonyOS security logs indicating permission violations or unusual app behavior