CVE-2024-20134
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in the RIL (Radio Interface Layer) component of MediaTek chipsets. It allows local privilege escalation to System level without user interaction. Affects devices using vulnerable MediaTek chipsets with RIL implementations.
💻 Affected Systems
- MediaTek chipsets with RIL implementation
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to execute arbitrary code with System privileges, potentially gaining persistent access to the device.
Likely Case
Local privilege escalation allowing malware to gain elevated permissions, bypass security controls, and access sensitive system resources.
If Mitigated
Limited impact if proper application sandboxing and SELinux/security policies are enforced, though System privileges still represent significant risk.
🎯 Exploit Status
Requires System execution privileges initially, but no user interaction needed. Exploitation likely requires understanding of RIL implementation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: ALPS09154589
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/December-2024
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware update 2. Apply MediaTek-provided patch ALPS09154589 3. Update device firmware through official channels 4. Reboot device after update
🔧 Temporary Workarounds
Restrict RIL permissions
androidLimit which applications can access RIL services through SELinux policies or permission restrictions
# Requires root access and SELinux knowledge
# Custom SELinux policy modifications needed
🧯 If You Can't Patch
- Implement strict application sandboxing to limit potential damage from privilege escalation
- Monitor for suspicious privilege escalation attempts and unusual RIL service access patterns
🔍 How to Verify
Check if Vulnerable:
Check device chipset information and firmware version against MediaTek security bulletin. Command: getprop ro.board.platformCheck Version:
getprop ro.build.version.security_patchVerify Fix Applied:
Verify patch ALPS09154589 is applied in firmware version and check for updated security patch level📡 Detection & Monitoring
Log Indicators:
- Unusual RIL service access patterns
- Privilege escalation attempts in system logs
- SELinux denials related to RIL services
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
source="android_system" AND (event="privilege_escalation" OR event="ril_access")