CVE-2020-9223
📋 TL;DR
This vulnerability in some Huawei smartphones allows remote attackers to send specially crafted messages that cause denial of service (DoS) on specific modules. The attack can be executed without authentication and affects devices that receive these abnormal messages. Users of affected Huawei smartphone models are at risk.
💻 Affected Systems
- Huawei smartphones (specific models not detailed in advisory)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of critical smartphone functions, rendering the device unusable until reboot or factory reset.
Likely Case
Temporary service disruption affecting specific modules (potentially network, messaging, or system services) requiring device reboot.
If Mitigated
No impact if patches are applied or if devices are not exposed to malicious messages.
🎯 Exploit Status
Remote exploitation possible without authentication. Attack requires sending specially crafted messages to vulnerable devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security updates for specific device models
Vendor Advisory: https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20201216-03-smartphone-en
Restart Required: Yes
Instructions:
1. Check for security updates in device Settings > System & updates > Software update. 2. Install available security patches. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable unnecessary message services
allTemporarily disable non-essential messaging services that could receive abnormal messages
Use network filtering
allImplement network-level filtering to block suspicious messages
🧯 If You Can't Patch
- Isolate vulnerable devices from untrusted networks
- Implement strict network access controls and monitoring for abnormal message patterns
🔍 How to Verify
Check if Vulnerable:
Check device model and software version against Huawei's security advisory. Settings > About phone > Build number/EMUI version.Check Version:
No command-line command - use device Settings menuVerify Fix Applied:
Verify security patch level in Settings > About phone > Build number and ensure it includes December 2020 or later security patches.📡 Detection & Monitoring
Log Indicators:
- Unexpected system crashes
- Module/service failures
- Abnormal message reception logs
Network Indicators:
- Unusual message patterns to devices
- Spike in malformed network packets
SIEM Query:
device_logs: ("crash" OR "DoS" OR "service failure") AND device_vendor:"Huawei"