CVE-2022-20126
📋 TL;DR
This vulnerability allows a malicious app on an Android device to enable Bluetooth discovery mode without user permission, potentially exposing the device to unauthorized connections. It affects Android versions 10 through 12L. Exploitation requires user interaction to install the malicious app.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker could pair with the device via Bluetooth without user knowledge, potentially enabling data exfiltration, installing malware, or conducting man-in-the-middle attacks on Bluetooth communications.
Likely Case
A malicious app could enable Bluetooth discovery to make the device visible to nearby attackers, increasing attack surface for Bluetooth-based exploits.
If Mitigated
With proper app vetting and Bluetooth security controls, impact is limited to temporary Bluetooth visibility without data compromise.
🎯 Exploit Status
Exploitation requires a malicious app to be installed with user interaction, but the actual privilege escalation is straightforward once the app runs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin June 2022 patches
Vendor Advisory: https://source.android.com/security/bulletin/2022-06-01
Restart Required: Yes
Instructions:
1. Apply Android Security Update from June 2022 or later. 2. Check for updates in Settings > System > System update. 3. Install available updates. 4. Reboot device after installation.
🔧 Temporary Workarounds
Disable Bluetooth when not in use
androidTurn off Bluetooth to prevent any discovery mode activation
Settings > Connected devices > Connection preferences > Bluetooth > Toggle off
Restrict app installations
androidPrevent installation of apps from unknown sources
Settings > Security > Install unknown apps > Disable for all apps
🧯 If You Can't Patch
- Disable Bluetooth completely in device settings
- Implement mobile device management (MDM) to block suspicious apps and monitor Bluetooth state
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Android version. If version is 10, 11, 12, or 12L without June 2022 security patches, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android Security Patch Level is June 2022 or later in Settings > About phone > Android version > Android security update.📡 Detection & Monitoring
Log Indicators:
- Unexpected Bluetooth discovery mode activation without user interaction in system logs
- Apps requesting Bluetooth permissions without legitimate need
Network Indicators:
- Unexpected Bluetooth device visibility to scanning tools
SIEM Query:
source="android_system" AND "BluetoothAdapter" AND "startDiscovery" AND NOT user_interaction=true