CVE-2024-20120
📋 TL;DR
CVE-2024-20120 is an out-of-bounds write vulnerability in KeyInstall that allows local privilege escalation to System level without user interaction. This affects MediaTek devices with vulnerable firmware. Attackers with initial access can exploit this to gain full system control.
💻 Affected Systems
- MediaTek devices with KeyInstall component
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install persistent malware, steal sensitive data, or disable security controls.
Likely Case
Local attackers escalate privileges to install additional malware, maintain persistence, or bypass security restrictions.
If Mitigated
Limited impact if proper application sandboxing and privilege separation are enforced, though kernel-level access remains possible.
🎯 Exploit Status
Requires local access and System execution privileges. No user interaction needed once initial access obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patch ID: ALPS08956986
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/November-2024
Restart Required: Yes
Instructions:
1. Check device firmware version
2. Contact device manufacturer for updated firmware
3. Apply firmware update containing patch ALPS08956986
4. Reboot device
🔧 Temporary Workarounds
Restrict local access
allLimit physical and remote local access to vulnerable devices
Application sandboxing
androidEnforce strict application isolation to limit privilege escalation impact
🧯 If You Can't Patch
- Isolate affected devices on separate network segments
- Implement strict access controls and monitoring for privileged operations
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against MediaTek security bulletin or contact manufacturerCheck Version:
Check device settings > About phone > Build number or firmware versionVerify Fix Applied:
Verify patch ALPS08956986 is applied in firmware version details📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- Suspicious KeyInstall process activity
- Unexpected system-level process execution
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
Process creation events with parent-child privilege escalation patterns involving system processes