CVE-2024-20039
📋 TL;DR
This CVE describes a critical out-of-bounds write vulnerability in MediaTek modem protocol that allows remote code execution without user interaction or additional privileges. Attackers can exploit this flaw to execute arbitrary code on affected devices. The vulnerability impacts devices using MediaTek chipsets with vulnerable modem firmware.
💻 Affected Systems
- MediaTek chipset-based devices (smartphones, tablets, IoT devices)
📦 What is this software?
Lr12a by Mediatek
Lr13 by Mediatek
Nr15 by Mediatek
Nr16 by Mediatek
Nr17 by Mediatek
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, exfiltrate sensitive data, or join device to botnet.
Likely Case
Remote code execution leading to data theft, surveillance capabilities, or device instability.
If Mitigated
Limited impact if network segmentation and strict access controls prevent modem interface exposure.
🎯 Exploit Status
No authentication required, but exploitation requires understanding of modem protocol and ability to send crafted packets to modem interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: MOLY01240012
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/April-2024
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Apply MediaTek-provided modem firmware patch. 3. Reboot device to activate patched firmware.
🔧 Temporary Workarounds
Network Segmentation
allIsolate devices from untrusted networks and restrict access to modem interfaces.
Firewall Rules
allBlock unnecessary modem protocol traffic at network perimeter.
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with strict access controls
- Implement network monitoring for unusual modem protocol traffic
🔍 How to Verify
Check if Vulnerable:
Check device specifications for MediaTek chipset and contact manufacturer for vulnerability status.Check Version:
Manufacturer-specific commands vary; typically accessed through device settings or diagnostic menus.Verify Fix Applied:
Verify modem firmware version includes patch MOLY01240012 through manufacturer tools or settings.📡 Detection & Monitoring
Log Indicators:
- Modem firmware crash logs
- Unexpected modem resets
- Abnormal modem protocol traffic
Network Indicators:
- Unusual modem protocol packets
- Suspicious traffic to modem interfaces
SIEM Query:
Search for modem-related crashes or unexpected modem interface communications