CVE-2021-37098
📋 TL;DR
CVE-2021-37098 is a data processing error vulnerability in the Hilinksvc service on HarmonyOS devices. Successful exploitation can cause application crashes through denial of service. This affects Huawei devices running vulnerable versions of HarmonyOS.
💻 Affected Systems
- Huawei HarmonyOS devices
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of Hilinksvc functionality leading to denial of service for dependent applications and potential system instability.
Likely Case
Application crash affecting specific Hilinksvc functionality, potentially disrupting device connectivity features.
If Mitigated
Minimal impact with proper network segmentation and service isolation preventing exploitation attempts.
🎯 Exploit Status
Vulnerability details are limited in public documentation, suggesting exploitation requires specific conditions or knowledge.
🛠️ 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-202110-0000001162998526
Restart Required: Yes
Instructions:
1. Check current HarmonyOS version. 2. Update to version 2.0.0.230 or later via Settings > System & updates > Software update. 3. Restart device after update completes.
🔧 Temporary Workarounds
Disable Hilinksvc service
android/harmonyosTemporarily disable the vulnerable service if not required for device functionality
adb shell pm disable com.huawei.hilinksvc
Network segmentation
allRestrict network access to devices running vulnerable HarmonyOS versions
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure of HarmonyOS devices
- Monitor for abnormal Hilinksvc service behavior or crashes as potential exploitation indicators
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version via Settings > About phone > HarmonyOS version. If version is earlier than 2.0.0.230, device is vulnerable.Check Version:
adb shell getprop ro.build.version.harmonyVerify Fix Applied:
Confirm HarmonyOS version is 2.0.0.230 or later via Settings > About phone > HarmonyOS version.📡 Detection & Monitoring
Log Indicators:
- Hilinksvc service crashes
- Abnormal termination of com.huawei.hilinksvc process
- Denial of service events related to connectivity services
Network Indicators:
- Unusual network traffic patterns to HarmonyOS devices on Hilinksvc ports
- Connection attempts followed by service disruption
SIEM Query:
process_name:"hilinksvc" AND (event_type:"crash" OR event_type:"termination")