CVE-2024-20105
📋 TL;DR
CVE-2024-20105 is an out-of-bounds write vulnerability in MediaTek's m4u (Memory Management Unit) driver that allows local privilege escalation. Attackers with initial System privilege access can exploit this to gain higher privileges without user interaction. This affects devices using MediaTek chipsets with vulnerable m4u implementations.
💻 Affected Systems
- MediaTek chipsets with m4u functionality
📦 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 execute arbitrary code with kernel privileges, potentially leading to persistent backdoors, data theft, or device bricking.
Likely Case
Local privilege escalation from System to higher kernel privileges, enabling installation of malware, bypassing security controls, or accessing protected system resources.
If Mitigated
Limited impact if proper privilege separation and kernel hardening are implemented, though the vulnerability still provides a foothold for further exploitation.
🎯 Exploit Status
Requires existing System privilege access. The missing bounds check makes exploitation relatively straightforward for attackers with kernel development skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: ALPS09062027
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/January-2025
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Apply MediaTek patch ALPS09062027. 3. Update device firmware to latest version. 4. Reboot device after patching.
🔧 Temporary Workarounds
Restrict System Privilege Access
linuxLimit which applications and users can obtain System privilege to reduce attack surface
Review and tighten SELinux/AppArmor policies
Audit applications with system-level permissions
🧯 If You Can't Patch
- Implement strict application sandboxing and privilege separation
- Deploy runtime kernel protection solutions and monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check kernel version and patch status via device manufacturer's security bulletin. Look for m4u driver version information in /proc/modules or kernel logs.Check Version:
cat /proc/version && dmesg | grep -i m4uVerify Fix Applied:
Verify patch ALPS09062027 is applied through firmware version checks and kernel module version verification.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- m4u driver error messages
- Unexpected privilege escalation attempts in audit logs
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="kernel" AND ("m4u" OR "out of bounds" OR "privilege escalation")