CVE-2021-37064
📋 TL;DR
This vulnerability allows attackers to create arbitrary files on Huawei smartphones by exploiting improper pathname restrictions. It affects Huawei devices running HarmonyOS with insufficient directory access controls. Successful exploitation could lead to data manipulation or system compromise.
💻 Affected Systems
- Huawei Smartphones
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through arbitrary file creation leading to privilege escalation, data corruption, or persistent backdoor installation.
Likely Case
Unauthorized file creation in sensitive directories, potentially enabling data theft, application manipulation, or denial of service.
If Mitigated
Limited impact with proper file system permissions and application sandboxing in place.
🎯 Exploit Status
Exploitation requires local access or malicious app installation. No public exploit code identified in available references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS security updates from September 2021 onward
Vendor Advisory: https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install available security updates. 3. Restart device after installation.
🔧 Temporary Workarounds
Restrict app permissions
allLimit file system access for untrusted applications
Disable unknown sources
allPrevent installation of apps from untrusted sources
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks
- Implement strict application whitelisting policies
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS versionCheck Version:
Not applicable for mobile devices - use device settings interfaceVerify Fix Applied:
Verify installed security patch level in Settings > Security > Security update📡 Detection & Monitoring
Log Indicators:
- Unexpected file creation events in system logs
- Unauthorized directory access attempts
Network Indicators:
- Unusual outbound connections from mobile devices
SIEM Query:
Not applicable - primarily local device vulnerability