CVE-2021-22448
📋 TL;DR
This CVE describes an improper verification vulnerability in Huawei smartphones that allows unauthorized read and write access to certain files. Attackers could potentially access sensitive data or modify system files. The vulnerability affects specific Huawei smartphone models running certain EMUI versions.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to access sensitive user data, install persistent malware, or brick the device by modifying critical system files.
Likely Case
Unauthorized access to user files including photos, documents, and app data, potentially leading to data theft or privacy violations.
If Mitigated
Limited impact with proper security controls, potentially restricted to non-sensitive files or requiring physical access to the device.
🎯 Exploit Status
Exploitation likely requires local access to the device or a malicious app with certain permissions. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: EMUI 11.0.0.195 and later versions
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/6/
Restart Required: Yes
Instructions:
1. Navigate to Settings > System & updates > Software update. 2. Check for available updates. 3. Download and install EMUI 11.0.0.195 or later. 4. Restart the device after installation completes.
🔧 Temporary Workarounds
Disable unknown sources installation
androidPrevent installation of apps from unknown sources to reduce attack surface
Settings > Security > More settings > Install apps from external sources > Disable for all apps
Enable app verification
androidEnable Google Play Protect or Huawei AppGallery security scanning
Settings > Security > Google Play Protect > Scan device for security threats (enable)
🧯 If You Can't Patch
- Restrict physical access to devices and implement strict mobile device management policies
- Monitor for suspicious file access patterns and implement application whitelisting
🔍 How to Verify
Check if Vulnerable:
Check EMUI version in Settings > About phone > EMUI version. If version is earlier than 11.0.0.195, the device is vulnerable.Check Version:
Settings > About phone > EMUI versionVerify Fix Applied:
Verify EMUI version is 11.0.0.195 or later in Settings > About phone > EMUI version.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in system logs
- Unauthorized file modification attempts in security logs
Network Indicators:
- Unusual outbound connections from mobile devices
- Suspicious data exfiltration patterns
SIEM Query:
source="android_logs" AND (event_type="file_access" OR event_type="file_modification") AND user="unauthorized"