CVE-2021-22403
📋 TL;DR
This vulnerability in Huawei smartphones allows attackers to hijack unverified providers, potentially enabling device takeover and UI spoofing to trick users into executing malicious commands. It affects Huawei smartphone users who haven't applied security patches. The high CVSS score indicates critical severity requiring immediate attention.
💻 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 execute arbitrary code, steal sensitive data, install persistent malware, and control device functions remotely.
Likely Case
Attackers create fake system prompts or interfaces to trick users into granting permissions or installing malicious apps, leading to data theft or further compromise.
If Mitigated
With proper patching and security controls, the attack surface is eliminated, though users may still be vulnerable to social engineering through other vectors.
🎯 Exploit Status
Exploitation requires user interaction through spoofed UI but doesn't require authentication. The vulnerability involves provider hijacking which could be combined with social engineering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates released in July 2021
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/7/
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System & updates > Software update. 2. Download and install the latest security patch. 3. Restart device after installation completes.
🔧 Temporary Workarounds
Disable unknown sources
androidPrevent installation of apps from unknown sources to reduce attack surface
Review app permissions
androidRegularly audit and restrict unnecessary app permissions
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement mobile device management (MDM) with strict security policies
🔍 How to Verify
Check if Vulnerable:
Check if device has received security updates after July 2021. Go to Settings > About phone > Build number to check patch level.Check Version:
No command line access; check via Settings > About phone > Build numberVerify Fix Applied:
Verify security patch level includes July 2021 or later updates in Settings > About phone > Build number📡 Detection & Monitoring
Log Indicators:
- Unusual provider registration attempts
- Suspicious app installation events
- Permission escalation attempts
Network Indicators:
- Connections to suspicious domains after UI spoofing events
- Unexpected data exfiltration
SIEM Query:
Not applicable for typical smartphone environments; use mobile threat detection solutions instead