CVE-2019-20541
📋 TL;DR
This CVE describes a stack overflow vulnerability in Wi-Fi kernel drivers on Samsung mobile devices with Android 9.0 (Pie) using Exynos chipsets. Successful exploitation could allow attackers to execute arbitrary code with kernel privileges. Only Samsung mobile devices with specific hardware/software combinations are affected.
💻 Affected Systems
- Samsung mobile devices with Exynos chipsets
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with kernel-level code execution, potentially leading to persistent malware installation, data theft, and complete device control.
Likely Case
Local privilege escalation allowing attackers to gain kernel privileges from a lower-privileged context, potentially enabling further system compromise.
If Mitigated
Limited impact if devices are patched and have proper security controls; unpatched devices remain vulnerable to local attackers.
🎯 Exploit Status
Exploitation requires local access or proximity to target device. Kernel driver vulnerabilities typically require specific expertise to exploit reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: November 2019 security update or later
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb
Restart Required: Yes
Instructions:
1. Check for system updates in device Settings > Software update. 2. Install November 2019 or later security update. 3. Restart device after installation.
🔧 Temporary Workarounds
Disable Wi-Fi when not needed
androidTurn off Wi-Fi to prevent potential exploitation through vulnerable drivers
Use mobile data instead of Wi-Fi
androidAvoid connecting to untrusted Wi-Fi networks to reduce attack surface
🧯 If You Can't Patch
- Replace affected devices with updated models or different manufacturers
- Implement strict physical security controls and limit device access
🔍 How to Verify
Check if Vulnerable:
Check device model and Android version: Settings > About phone > Software information. If device has Exynos chipset and Android 9.0, it may be vulnerable.Check Version:
Not applicable - check through device settings UIVerify Fix Applied:
Verify security patch level is November 2019 or later: Settings > About phone > Software information > Android security patch level.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Wi-Fi driver crash reports
- Unexpected system reboots
Network Indicators:
- Unusual Wi-Fi connection attempts
- Suspicious network traffic patterns from mobile devices
SIEM Query:
Not applicable - device-level vulnerability