CVE-2021-22422
📋 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. Only HarmonyOS devices with vulnerable versions are affected.
💻 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
Application crash, denial of service, or limited memory corruption affecting specific processes
If Mitigated
Contained impact within sandboxed environment with minimal privilege escalation
🎯 Exploit Status
Requires local access and specific conditions to trigger integer overflow; memory corruption exploitation requires additional steps
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://device.harmonyos.com/cn/docs/security/update/oem_security_update_phone_202106-0000001165452077
Restart Required: Yes
Instructions:
1. Check for HarmonyOS security updates in device settings. 2. Apply available security patches. 3. Reboot device after update completion.
🔧 Temporary Workarounds
Restrict local user access
allLimit physical and remote local access to vulnerable devices
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local access
- Monitor for unusual process behavior or memory corruption events
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in device settings and compare against Huawei security advisoriesCheck Version:
Settings > About phone > HarmonyOS versionVerify Fix Applied:
Verify security update installation date and version in device settings📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes
- Memory access violation logs
- Kernel panic events
Network Indicators:
- None (local exploit only)
SIEM Query:
Process:name="*" AND (EventID=1000 OR EventID=1001) AND Description CONTAINS "access violation"