CVE-2022-21777
📋 TL;DR
CVE-2022-21777 is a permission bypass vulnerability in Autoboot that allows local attackers to escalate privileges without user interaction. This affects devices using MediaTek chipsets with vulnerable Autoboot implementations. Attackers can gain elevated system access from a standard user context.
💻 Affected Systems
- MediaTek chipset devices with Autoboot functionality
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root/admin privileges, allowing installation of persistent malware, data theft, and disabling of security controls.
Likely Case
Local privilege escalation enabling unauthorized access to sensitive system resources and applications.
If Mitigated
Limited impact if proper patch management and least privilege principles are enforced, though risk remains until patched.
🎯 Exploit Status
Exploitation requires local access but no user interaction; complexity is low due to missing permission check.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in firmware updates containing ALPS06713894
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/July-2022
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply the security patch containing ALPS06713894. 3. Reboot device to complete installation.
🔧 Temporary Workarounds
Disable unnecessary services
allReduce attack surface by disabling non-essential services and features
Implement strict access controls
allEnforce least privilege and monitor for suspicious local privilege escalation attempts
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement application whitelisting and monitor for unauthorized privilege changes
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and patch level; devices without ALPS06713894 patch are vulnerableCheck Version:
Device-specific commands vary by manufacturer; typically in Settings > About Phone > Build NumberVerify Fix Applied:
Verify firmware version includes ALPS06713894 patch ID in security updates📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Autoboot service anomalies
- Unauthorized access to protected resources
Network Indicators:
- None - this is a local exploit
SIEM Query:
Search for privilege escalation events from standard user to root/admin on affected devices