CVE-2022-20140
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Android devices without user interaction by exploiting an out-of-bounds write in Bluetooth GATT handling. It affects Android 12 and 12L devices, potentially enabling complete device compromise.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full device compromise, data theft, persistent backdoor installation, and lateral movement to other devices.
Likely Case
Device crash/instability, privilege escalation to system-level access, and potential data exfiltration via Bluetooth.
If Mitigated
Limited impact with proper network segmentation, Bluetooth disabled, and updated devices.
🎯 Exploit Status
Exploitation requires Bluetooth proximity but no authentication or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2022-06-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/2022-06-01
Restart Required: Yes
Instructions:
1. Check Settings > Security > Security update. 2. Install June 2022 or later Android security patch. 3. Reboot device. 4. Verify patch level in Settings.
🔧 Temporary Workarounds
Disable Bluetooth
androidTurn off Bluetooth to prevent exploitation via this vector
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Turn off
Restrict Bluetooth Visibility
androidSet Bluetooth to non-discoverable mode to reduce attack surface
adb shell settings put global bluetooth_discoverability 0
Settings > Connected devices > Connection preferences > Bluetooth > Device name > Turn off visibility
🧯 If You Can't Patch
- Disable Bluetooth completely when not in use
- Implement physical security controls to prevent unauthorized Bluetooth devices in proximity
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > Android version and Security patch level. If Android 12/12L with patch level before June 2022, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Security patch level shows '2022-06-01' or later in Settings > About phone.📡 Detection & Monitoring
Log Indicators:
- Bluetooth stack crashes in logcat
- Unexpected GATT service requests
- Memory corruption errors in Bluetooth-related processes
Network Indicators:
- Unusual Bluetooth connection attempts from unknown devices
- Multiple failed GATT service requests
SIEM Query:
source="android_logcat" AND "Bluetooth" AND ("crash" OR "segfault" OR "out of bounds")