CVE-2021-22372
📋 TL;DR
This vulnerability in Huawei smartphones allows attackers to compromise security features, potentially exposing confidential service information. It affects users of specific Huawei smartphone models running vulnerable software versions. The vulnerability impacts service confidentiality when successfully exploited.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of service confidentiality, allowing unauthorized access to sensitive service data and user information stored on the device.
Likely Case
Limited information disclosure of service-related data, potentially exposing authentication tokens, configuration details, or service metadata.
If Mitigated
Minimal impact with proper security controls, potentially limited to non-critical service information exposure.
🎯 Exploit Status
Exploitation requires specific conditions and knowledge of the security feature vulnerability; no public exploit code available
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions specified in Huawei's May 2021 security updates
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/5/
Restart Required: Yes
Instructions:
1. Check for available updates in Settings > System & updates > Software update. 2. Download and install the latest security update. 3. Restart the device after installation completes.
🔧 Temporary Workarounds
Disable unnecessary services
allReduce attack surface by disabling non-essential services and features
Network segmentation
allIsolate affected devices from critical networks
🧯 If You Can't Patch
- Isolate affected devices from networks containing sensitive data
- Implement strict access controls and monitor for unusual service access patterns
🔍 How to Verify
Check if Vulnerable:
Check device version in Settings > About phone > Build number and compare against Huawei's May 2021 security bulletinCheck Version:
Settings > About phone > Build number (no command line available for consumer devices)Verify Fix Applied:
Verify the installed security patch level in Settings > About phone > Build number matches or exceeds the patched version📡 Detection & Monitoring
Log Indicators:
- Unusual service access patterns
- Security feature failures or errors
- Unexpected privilege escalation attempts
Network Indicators:
- Anomalous service communication from affected devices
- Unexpected data exfiltration patterns
SIEM Query:
device.vendor:Huawei AND event.category:security AND (event.action:feature_failure OR event.action:service_compromise)