CVE-2023-39402
📋 TL;DR
This CVE describes a parameter verification vulnerability in Huawei's installd module that allows unauthorized reading and writing of sandbox files. Attackers could potentially access or modify sensitive application data. This affects Huawei devices running HarmonyOS.
💻 Affected Systems
- Huawei devices with HarmonyOS
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of application sandboxes allowing data theft, data corruption, or privilege escalation to system-level access.
Likely Case
Unauthorized access to sensitive application data stored in sandboxes, potentially including user credentials, personal information, or app-specific data.
If Mitigated
Limited impact with proper access controls and monitoring, though the vulnerability still presents a security risk.
🎯 Exploit Status
Exploitation requires local access or ability to execute code on the device. The vulnerability is in parameter verification which could be exploited through crafted installation requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS security updates from August 2023 onward
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2023/8/
Restart Required: Yes
Instructions:
1. Check for available system updates in device settings. 2. Install the latest HarmonyOS security update. 3. Reboot the device after installation completes.
🔧 Temporary Workarounds
Restrict application installation sources
allOnly install applications from trusted sources like official app stores
Monitor for suspicious installation activity
allImplement monitoring for unusual installation attempts or parameter manipulation
🧯 If You Can't Patch
- Implement strict application whitelisting to prevent unauthorized app installations
- Deploy endpoint detection and response (EDR) solutions to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS version. If version predates August 2023 security updates, device is likely vulnerable.Check Version:
Settings > About phone > HarmonyOS version (no CLI command available for consumer devices)Verify Fix Applied:
Verify HarmonyOS version includes August 2023 or later security patches in Settings > About phone > HarmonyOS version.📡 Detection & Monitoring
Log Indicators:
- Unusual installation activity
- Failed or abnormal parameter validation in installd logs
- Multiple installation attempts with modified parameters
Network Indicators:
- Unusual network traffic from installation processes
- Connections to untrusted installation sources
SIEM Query:
process_name:"installd" AND (event_type:"parameter_validation_failure" OR event_type:"sandbox_violation")🔗 References
- https://consumer.huawei.com/en/support/bulletin/2023/8/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202308-0000001667644725
- https://consumer.huawei.com/en/support/bulletin/2023/8/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202308-0000001667644725
