CVE-2023-32820
📋 TL;DR
This vulnerability in MediaTek wlan firmware allows remote attackers to trigger a firmware assertion through improper input handling, causing denial of service without requiring authentication or user interaction. It affects devices using MediaTek wireless chipsets with vulnerable firmware versions. The attack can be executed remotely over Wi-Fi networks.
💻 Affected Systems
- MediaTek wireless chipsets with wlan firmware
📦 What is this software?
Android by Google
Android by Google
Android by Google
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⚠️ Risk & Real-World Impact
Worst Case
Permanent device bricking requiring hardware replacement if firmware corruption occurs during assertion
Likely Case
Temporary denial of service requiring device reboot to restore wireless functionality
If Mitigated
Minimal impact if patched firmware is installed and network segmentation is implemented
🎯 Exploit Status
Requires sending specially crafted packets to vulnerable wireless interface
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware with patch ID ALPS07932637
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/October-2023
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates 2. Apply firmware update from device vendor 3. Reboot device to activate new firmware
🔧 Temporary Workarounds
Disable vulnerable wireless interfaces
linuxTemporarily disable Wi-Fi functionality to prevent exploitation
nmcli radio wifi off
ip link set wlan0 down
Network segmentation
allIsolate vulnerable devices on separate VLANs with strict firewall rules
🧯 If You Can't Patch
- Implement strict network access controls to limit wireless traffic to trusted sources only
- Deploy network intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version against vendor advisory or contact device manufacturerCheck Version:
Manufacturer-specific commands vary by device; check system information in device settingsVerify Fix Applied:
Verify firmware version includes patch ID ALPS07932637📡 Detection & Monitoring
Log Indicators:
- Firmware assertion/crash logs
- Unexpected wireless interface resets
- Kernel panic related to wlan driver
Network Indicators:
- Malformed 802.11 packets targeting MediaTek devices
- Unusual wireless traffic patterns
SIEM Query:
source="*wlan*" AND ("assertion" OR "panic" OR "crash")