CVE-2021-37076
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in Huawei smartphones running HarmonyOS. Successful exploitation could allow an attacker to cause denial of service or potentially leak sensitive information from memory. The vulnerability affects Huawei smartphone users running vulnerable HarmonyOS versions.
💻 Affected Systems
- Huawei smartphones running HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
An attacker could cause device crashes, denial of service, or potentially read sensitive information from adjacent memory, leading to information disclosure.
Likely Case
Most probable impact is application crashes or device instability, potentially leading to denial of service conditions.
If Mitigated
With proper patching, the vulnerability is eliminated. With network segmentation and access controls, exploitation risk is significantly reduced.
🎯 Exploit Status
Out-of-bounds read vulnerabilities typically require some level of access or interaction with the vulnerable component. No public exploit code was found in available references.
🛠️ 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 device settings. 2. Navigate to System Update in settings. 3. Download and install available updates. 4. Restart device after update completes.
🔧 Temporary Workarounds
Network segmentation
allSegment Huawei devices from critical networks and limit network access to reduce attack surface
Application restrictions
allLimit installation of untrusted applications and restrict application permissions
🧯 If You Can't Patch
- Isolate affected devices from critical networks and internet access
- Implement strict application control policies and monitor for unusual device behavior
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in device settings: Settings > System & updates > Software update > Current versionCheck Version:
Not applicable - check through device settings interfaceVerify Fix Applied:
Verify HarmonyOS version is 2.0.0.230 or later in device settings📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Memory access violation logs
- System instability events
Network Indicators:
- Unusual network traffic patterns from affected devices
- Connection attempts to suspicious endpoints
SIEM Query:
Not applicable - device-specific logs would need to be integrated into SIEM