CVE-2021-37068
📋 TL;DR
This CVE describes a resource management error vulnerability in Huawei smartphones running HarmonyOS, which could allow an attacker to cause a denial of service (DoS) by exhausting system resources. It affects users of specific Huawei smartphone models with vulnerable HarmonyOS versions, potentially disrupting device functionality.
💻 Affected Systems
- Huawei smartphones running HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash or unresponsiveness, rendering the smartphone unusable until rebooted, potentially leading to data loss or service disruption.
Likely Case
Temporary performance degradation or application crashes, causing inconvenience but not permanent damage.
If Mitigated
Minimal impact if patched or with proper resource monitoring; devices may experience brief slowdowns but remain operational.
🎯 Exploit Status
Exploitation likely requires local access or malicious app installation; no public proof-of-concept known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Huawei security bulletins for specific patched versions
Vendor Advisory: https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
Restart Required: Yes
Instructions:
1. Check for updates in device settings under System > Software Update. 2. Install any available security updates. 3. Restart the device as prompted.
🔧 Temporary Workarounds
Limit app installations
allRestrict installation of apps from untrusted sources to reduce risk of exploitation via malicious apps.
🧯 If You Can't Patch
- Monitor device performance and restart if unusual slowdowns or crashes occur.
- Avoid installing unknown apps and keep device usage to trusted sources only.
🔍 How to Verify
Check if Vulnerable:
Check device HarmonyOS version in settings: Settings > About phone > HarmonyOS version, and compare with Huawei security bulletins.Check Version:
Not applicable; use device settings menu as above.Verify Fix Applied:
Ensure HarmonyOS version is updated to a patched release as specified in Huawei advisories, and verify no abnormal resource usage.📡 Detection & Monitoring
Log Indicators:
- Unusual system resource exhaustion logs, frequent app or system crashes in device logs.
Network Indicators:
- Not applicable; primarily local exploitation.
SIEM Query:
Not applicable for typical smartphone environments; focus on device monitoring tools.