CVE-2023-39389
📋 TL;DR
This vulnerability in Huawei's PMS module allows attackers to exploit improper input validation, potentially causing denial of service by making the home screen unavailable. It affects Huawei devices running HarmonyOS. The vulnerability requires local access to the device.
💻 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 denial of service rendering the device's home screen unusable, requiring device restart or factory reset to recover functionality.
Likely Case
Temporary home screen unavailability requiring user intervention to restart affected services or the device.
If Mitigated
No impact if proper input validation is implemented or if the vulnerability is patched.
🎯 Exploit Status
Exploitation requires local access to the device and knowledge of specific input parameters to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS security patches released in August 2023
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2023/8/
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install the latest HarmonyOS security update. 3. Restart the device after installation completes.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and local access to vulnerable devices to reduce attack surface
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local access to devices
- Monitor for abnormal device behavior or home screen crashes
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in device settings. If version is prior to August 2023 security patches, device is likely vulnerable.Check Version:
Settings > System & updates > Software update (on HarmonyOS devices)Verify Fix Applied:
Verify HarmonyOS version shows August 2023 or later security patches installed.📡 Detection & Monitoring
Log Indicators:
- PMS module crashes
- Home screen service failures
- Abnormal input parameter logs
Network Indicators:
- No network indicators - local vulnerability only
SIEM Query:
Search for PMS service crashes or home screen unavailability events in device logs🔗 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
