CVE-2022-20024
📋 TL;DR
This vulnerability allows local attackers to bypass permission checks in a MediaTek system service, potentially gaining elevated privileges without user interaction. It affects Android devices with MediaTek chipsets, allowing attackers with local access to escalate their privileges on the device.
💻 Affected Systems
- Android devices with MediaTek chipsets
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with root/system-level access, allowing installation of persistent malware, data theft, and bypassing of all security controls.
Likely Case
Local privilege escalation enabling unauthorized access to protected system resources, sensitive data, and ability to install malicious applications.
If Mitigated
Limited impact if devices are fully patched and have proper security controls like SELinux enforcing mode and application sandboxing.
🎯 Exploit Status
Exploitation requires local access but no user interaction. The missing permission check makes exploitation straightforward for attackers with local access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware with patch ID ALPS06219064
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/February-2022
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply the latest security patch from device vendor. 3. Reboot device after update. 4. Verify patch is applied through system settings.
🔧 Temporary Workarounds
Restrict physical access
allLimit physical access to devices to prevent local exploitation
Enable SELinux enforcing mode
linuxEnsure SELinux is in enforcing mode to limit privilege escalation impact
getenforce
setenforce 1
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict access controls and monitor for suspicious local activity
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and compare against patched versions from manufacturer. Look for patch ID ALPS06219064 in system updates.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify the security patch level includes February 2022 or later updates. Check system settings for applied security patches.📡 Detection & Monitoring
Log Indicators:
- Unusual system service access attempts
- Permission denial logs followed by successful access
- Unexpected privilege escalation events
Network Indicators:
- Local privilege escalation typically has minimal network indicators
SIEM Query:
source="android_system" AND (event="permission_denied" OR event="privilege_escalation")