CVE-2018-9456
📋 TL;DR
CVE-2018-9456 is an out-of-bounds read vulnerability in Android's Bluetooth SDP (Service Discovery Protocol) implementation that could allow remote attackers to cause denial of service without user interaction. This affects Android devices with vulnerable Bluetooth implementations, potentially impacting phones, tablets, and other Android-based devices.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker could crash the Bluetooth service or potentially cause device instability/reboot via specially crafted Bluetooth packets, leading to denial of service.
Likely Case
Bluetooth service crash requiring service restart or device reboot to restore functionality.
If Mitigated
Minimal impact if patched; Bluetooth functionality remains unaffected.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and sending malformed SDP packets. No authentication or user interaction needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2018-09-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/2018-09-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > Advanced > System update. 2. Install the September 2018 security patch or later. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable Bluetooth
androidTurn off Bluetooth when not in use to prevent exploitation
adb shell settings put global bluetooth_on 0
Or manually disable in Settings > Connected devices > Connection preferences > Bluetooth
Restrict Bluetooth Visibility
androidSet Bluetooth to non-discoverable mode to reduce attack surface
adb shell settings put global bluetooth_discoverability 0
Or in Settings: Bluetooth > Device name > Visibility timeout > Never visible
🧯 If You Can't Patch
- Disable Bluetooth completely when not actively using Bluetooth devices
- Implement network segmentation to isolate vulnerable devices from potential attackers
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level: Settings > About phone > Android security patch level. If before September 2018, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows '2018-09-01' or later date.📡 Detection & Monitoring
Log Indicators:
- Bluetooth service crashes in logcat
- SDP protocol errors in Bluetooth logs
- System stability issues when Bluetooth is active
Network Indicators:
- Unusual Bluetooth SDP traffic patterns
- Malformed SDP packets from unknown devices
SIEM Query:
source="android_logs" AND ("Bluetooth" AND ("crash" OR "SDP" OR "out of bounds"))