CVE-2021-37086
📋 TL;DR
This vulnerability in Huawei smartphones allows attackers to bypass UID sandbox isolation and read synchronization files from other applications. It affects Huawei devices running HarmonyOS. Successful exploitation could lead to unauthorized access to sensitive application data.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access sensitive synchronization data from any application on the device, potentially exposing credentials, personal information, or confidential business data.
Likely Case
Malicious applications could steal data from other installed applications, compromising user privacy and potentially obtaining authentication tokens or sensitive information.
If Mitigated
With proper application sandboxing and permission controls, the impact would be limited to non-sensitive application data only.
🎯 Exploit Status
Requires malicious application to be installed on target device. Exploitation involves bypassing UID sandbox isolation.
🛠️ 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. Check current HarmonyOS version in Settings > System & updates > Software update. 2. If version is before 2.0.0.230, download and install the latest update. 3. Restart device after installation completes.
🔧 Temporary Workarounds
Restrict application installations
allPrevent installation of untrusted applications by enabling app installation restrictions
Disable unnecessary synchronization
allTurn off synchronization for non-essential applications to reduce attack surface
🧯 If You Can't Patch
- Implement mobile device management (MDM) to control application installations
- Educate users about risks of installing untrusted applications from unofficial sources
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > System & updates > Software update. If version is earlier than 2.0.0.230, device is vulnerable.Check Version:
Settings > System & updates > Software update (no CLI command available)Verify Fix Applied:
After updating, verify HarmonyOS version is 2.0.0.230 or later in Settings > System & updates > Software update.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns across application sandboxes
- Multiple failed permission elevation attempts
Network Indicators:
- Unusual synchronization traffic from unexpected applications
SIEM Query:
Not applicable - local device vulnerability