CVE-2021-37043
📋 TL;DR
CVE-2021-37043 is a stack-based buffer overflow vulnerability in Huawei smartphones running HarmonyOS. Successful exploitation could allow malicious applications to consume system resources, potentially leading to denial of service. This affects Huawei smartphone users running vulnerable HarmonyOS versions.
💻 Affected Systems
- Huawei Smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Malicious application could cause system instability, resource exhaustion, or potentially execute arbitrary code with application-level privileges, leading to denial of service or further compromise.
Likely Case
Malicious applications could consume excessive system resources, causing performance degradation, application crashes, or temporary denial of service on affected devices.
If Mitigated
With proper application sandboxing and security controls, impact would be limited to the malicious application's own process space with minimal system-wide effects.
🎯 Exploit Status
Exploitation requires user to install and run a malicious application. The vulnerability is in the CWE-287 category (Improper Authentication), suggesting authentication bypass may be involved in triggering the buffer overflow.
🛠️ 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. Open Settings on Huawei device. 2. Navigate to System & updates > Software update. 3. Check for updates and install HarmonyOS 2.0.0.230 or later. 4. Restart device after installation completes.
🔧 Temporary Workarounds
Restrict application installations
allOnly install applications from official Huawei AppGallery store to reduce risk of malicious applications.
Enable enhanced security settings
allEnable 'Install apps from unknown sources' restriction in security settings.
🧯 If You Can't Patch
- Restrict device to only install applications from Huawei AppGallery
- Implement mobile device management (MDM) to control application installations
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS version. If version is earlier than 2.0.0.230, device is vulnerable.Check Version:
Settings > About phone > HarmonyOS versionVerify Fix Applied:
Verify HarmonyOS version is 2.0.0.230 or later in Settings > About phone > HarmonyOS version.📡 Detection & Monitoring
Log Indicators:
- Unusual application crashes
- Excessive resource consumption by specific applications
- Stack overflow errors in system logs
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Not applicable for typical mobile device scenarios