CVE-2021-22458
📋 TL;DR
This CVE describes a buffer overflow vulnerability in HarmonyOS that allows local attackers to execute arbitrary code. The vulnerability exists due to improper memory buffer restrictions in a HarmonyOS component. Systems running affected HarmonyOS versions are vulnerable to local privilege escalation.
💻 Affected Systems
- HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining root privileges and persistent access to the device.
Likely Case
Local privilege escalation allowing attackers to bypass security controls and access sensitive data.
If Mitigated
Limited impact with proper access controls and isolation mechanisms preventing lateral movement.
🎯 Exploit Status
Requires local access to the device; buffer overflow exploitation typically requires specific conditions to be met
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2021 security update
Vendor Advisory: https://device.harmonyos.com/cn/docs/security/update/security-bulletins-202107-0000001123874808
Restart Required: Yes
Instructions:
1. Check for available updates in device settings. 2. Apply the July 2021 security update. 3. Restart the device after installation.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and local network access to vulnerable devices
🧯 If You Can't Patch
- Isolate affected devices from critical networks and systems
- Implement strict access controls and monitoring for local user activities
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in device settings; versions prior to July 2021 security updates are vulnerableCheck Version:
Settings > About phone > HarmonyOS versionVerify Fix Applied:
Verify HarmonyOS version shows July 2021 or later security update installed📡 Detection & Monitoring
Log Indicators:
- Unusual process creation with elevated privileges
- Memory access violations in system logs
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Not applicable for this local vulnerability