CVE-2018-9401
📋 TL;DR
CVE-2018-9401 is a kernel memory access vulnerability in Android that allows user-space applications to read kernel memory due to incorrect bounds checking. This enables local privilege escalation without requiring user interaction or additional execution privileges. The vulnerability affects Android devices running vulnerable kernel versions.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains root privileges on the device, allowing complete system compromise, data theft, and persistent backdoor installation.
Likely Case
Malicious apps escalate privileges to access sensitive data, modify system settings, or install additional malware.
If Mitigated
With proper security controls and updated systems, the vulnerability is patched and cannot be exploited.
🎯 Exploit Status
Exploitation requires a malicious app to be installed on the device. No user interaction needed once installed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-06-05 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2018-06-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > Advanced > System update. 2. Install the June 2018 Android security patch. 3. Reboot the device after installation.
🔧 Temporary Workarounds
Disable unknown sources
AndroidPrevent installation of malicious apps from unknown sources
Settings > Security > Unknown sources (toggle off)
🧯 If You Can't Patch
- Restrict app installations to Google Play Store only
- Implement mobile device management (MDM) with app whitelisting
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If date is before 2018-06-05, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows 2018-06-05 or later date.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected privilege escalation attempts in system logs
- SELinux denials related to kernel memory access
Network Indicators:
- Unusual outbound connections from system processes
- Command and control traffic from privileged contexts
SIEM Query:
source="android_system" AND (event="kernel_panic" OR event="privilege_escalation")