CVE-2021-22451
📋 TL;DR
This integer overflow vulnerability in HarmonyOS allows local attackers to trigger memory corruption through arithmetic operations that exceed buffer boundaries. Attackers could potentially execute arbitrary code or cause denial of service. Only affects HarmonyOS devices with vulnerable versions.
💻 Affected Systems
- HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to complete system compromise, arbitrary code execution as root, or persistent backdoor installation.
Likely Case
Local denial of service (system crash) or limited privilege escalation within the affected component's context.
If Mitigated
Contained impact within sandboxed environment with proper memory protection mechanisms and privilege separation.
🎯 Exploit Status
Requires local access and specific conditions to trigger integer overflow. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security update July 2021
Vendor Advisory: https://device.harmonyos.com/cn/docs/security/update/security-bulletins-202107-0000001123874808
Restart Required: Yes
Instructions:
1. Check for available updates in HarmonyOS settings. 2. Apply the July 2021 security update. 3. Reboot device after installation completes.
🔧 Temporary Workarounds
Restrict local user privileges
allLimit user accounts to minimal necessary privileges to reduce attack surface
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Monitor for unusual process behavior or memory corruption events
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS version. If before July 2021 security update, likely vulnerable.Check Version:
Settings navigation only - no command line available for consumer devicesVerify Fix Applied:
Verify HarmonyOS version shows July 2021 security update applied in Settings > About phone > HarmonyOS version.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes
- Memory access violation logs
- Kernel panic events
Network Indicators:
- None - local exploit only
SIEM Query:
Process: (unexpected termination OR memory violation) AND DeviceOS: HarmonyOS