CVE-2021-37125
📋 TL;DR
CVE-2021-37125 is an information disclosure vulnerability in HarmonyOS that allows unauthorized actors to access sensitive files. This affects HarmonyOS devices where arbitrary file exposure could leak confidential data. The vulnerability impacts the confidentiality of affected systems.
💻 Affected Systems
- HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through exposure of sensitive configuration files, credentials, or user data leading to further attacks.
Likely Case
Unauthorized access to sensitive system files or user data, potentially enabling information gathering for targeted attacks.
If Mitigated
Limited exposure with proper access controls and network segmentation preventing unauthorized access to vulnerable components.
🎯 Exploit Status
Exploitation requires specific conditions to access arbitrary files; no public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS 2.0.0.210 or later
Vendor Advisory: https://device.harmonyos.com/en/docs/security/update/security-bulletins-202110-0000001162998526
Restart Required: Yes
Instructions:
1. Check current HarmonyOS version. 2. Apply security update through Settings > System & updates > Software update. 3. Restart device after update completes.
🔧 Temporary Workarounds
Restrict network access
allLimit network connectivity to vulnerable devices to trusted networks only
Disable unnecessary services
allTurn off non-essential services that might expose the vulnerability
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices
- Apply principle of least privilege and monitor for unusual file access patterns
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS versionCheck Version:
Settings > About phone > HarmonyOS versionVerify Fix Applied:
Verify version is 2.0.0.210 or later and check for successful update completion📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns
- Failed authorization attempts to sensitive files
Network Indicators:
- Unexpected network connections to device services
SIEM Query:
source="harmonyos" AND (event_type="file_access" OR auth_failure=true)