CVE-2021-22418
📋 TL;DR
This CVE describes an integer overflow vulnerability in HarmonyOS that allows local attackers to trigger memory corruption. Attackers could exploit this to potentially execute arbitrary code or cause denial of service. The vulnerability affects HarmonyOS devices where local access is possible.
💻 Affected Systems
- HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to full system compromise, arbitrary code execution, or persistent backdoor installation.
Likely Case
Local denial of service, application crashes, or limited privilege escalation within the affected component.
If Mitigated
Contained impact within sandboxed environment with proper memory protections and exploit mitigations enabled.
🎯 Exploit Status
Requires local access and knowledge of the vulnerable component. Integer overflow exploitation typically requires specific conditions to achieve code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: June 2021 security update
Vendor Advisory: https://device.harmonyos.com/cn/docs/security/update/oem_security_update_phone_202106-0000001165452077
Restart Required: Yes
Instructions:
1. Check for available updates in device settings. 2. Apply the June 2021 security update. 3. Reboot device after installation completes.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and logical access to devices to trusted users only
Application sandboxing
allEnsure applications run with minimal privileges and proper sandboxing
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement strict access controls and monitor for suspicious local activity
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in device settings. If version predates June 2021 security update, device is likely vulnerable.Check Version:
Settings > System & updates > Software update (HarmonyOS specific path)Verify Fix Applied:
Verify HarmonyOS version shows June 2021 security update applied in device settings.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes
- Memory access violations
- Abnormal system behavior from local applications
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Search for process crashes or memory violation events from HarmonyOS devices