CVE-2018-9373
📋 TL;DR
CVE-2018-9373 is a critical vulnerability in MediaTek's WLAN driver that allows remote attackers to execute arbitrary code without user interaction. This out-of-bounds write flaw enables privilege escalation from a remote network position. Android devices using affected MediaTek chipsets are primarily impacted.
💻 Affected Systems
- Android devices with MediaTek MTK WLAN chipsets
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, access sensitive data, and use device as pivot point in network attacks.
Likely Case
Remote code execution leading to data theft, surveillance capabilities, or device enrollment in botnets.
If Mitigated
Limited impact with proper network segmentation and device isolation, though still potentially exploitable within local network.
🎯 Exploit Status
No authentication required, but exploitation requires understanding of WLAN frame structure and driver internals. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-06-05 or later
Vendor Advisory: https://source.android.com/security/bulletin/2018-06-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > Advanced > System update. 2. Install the June 2018 security patch or later. 3. Reboot device after installation completes.
🔧 Temporary Workarounds
Disable WLAN
allTurn off Wi-Fi to prevent remote exploitation via wireless networks
adb shell svc wifi disable
Settings > Network & internet > Wi-Fi > Turn off
Network Segmentation
enterpriseIsolate vulnerable devices on separate VLANs with strict firewall rules
🧯 If You Can't Patch
- Segment vulnerable devices on isolated networks with no internet access
- Implement strict network monitoring for unusual WLAN traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If date is before June 5, 2018, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows '2018-06-05' or later date. Also check that Wi-Fi functions normally after patch.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- WLAN driver crash dumps
- Unusual privilege escalation attempts
Network Indicators:
- Malformed WLAN frames targeting MTK devices
- Unusual network traffic from Android devices after WLAN connection
SIEM Query:
source="android_system" AND (event="kernel_panic" OR event="driver_crash") AND process="wlan_mt"