CVE-2018-9414
📋 TL;DR
This vulnerability allows local privilege escalation on Android devices through an out-of-bounds stack write in the Bluetooth GATT server component. Attackers with user execution privileges can exploit this without user interaction to gain elevated system privileges. Affects Android devices running vulnerable versions.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to execute arbitrary code with system privileges, potentially installing persistent malware or accessing sensitive data.
Likely Case
Local privilege escalation allowing malware to gain system-level access, potentially enabling further exploitation or data exfiltration.
If Mitigated
Limited impact if device is patched or Bluetooth functionality is restricted, though local attackers could still attempt exploitation.
🎯 Exploit Status
Requires user execution privileges but no user interaction. Exploitation involves triggering the out-of-bounds write in the Bluetooth stack.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2018-07-01 or later
Vendor Advisory: https://source.android.com/docs/security/bulletin/pixel/2018-07-01
Restart Required: No
Instructions:
1. Check for system updates in Settings > System > Advanced > System update. 2. Install Android Security Patch Level 2018-07-01 or later. 3. Verify patch installation in Settings > About phone > Android security patch level.
🔧 Temporary Workarounds
Disable Bluetooth
AndroidTemporarily disable Bluetooth functionality to prevent exploitation through the vulnerable GATT server component.
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Turn off
🧯 If You Can't Patch
- Restrict Bluetooth usage to trusted devices only and disable when not needed
- Implement application sandboxing and privilege separation to limit potential damage from exploitation
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If earlier than 2018-07-01, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows 2018-07-01 or later in Settings > About phone > Android security patch level.📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth GATT server activity
- Process privilege escalation attempts
- Crash logs from com.android.bluetooth
Network Indicators:
- Suspicious Bluetooth pairing attempts
- Unusual GATT characteristic writes
SIEM Query:
source="android_logs" AND (process="com.android.bluetooth" AND message="*out of bounds*" OR message="*privilege escalation*")