CVE-2021-0586
📋 TL;DR
This CVE describes a tapjacking vulnerability in Android's Bluetooth device picker interface. Attackers can overlay malicious UI elements to trick users into selecting unintended Bluetooth devices, potentially leading to local privilege escalation. Affected users include anyone running vulnerable Android versions who uses Bluetooth device pairing.
💻 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 gains elevated privileges on the device, potentially accessing sensitive data or installing malware without user knowledge.
Likely Case
User inadvertently pairs with a malicious Bluetooth device, enabling data interception or unauthorized access to device functions.
If Mitigated
With proper security controls and user awareness, the risk is limited to temporary inconvenience or failed pairing attempts.
🎯 Exploit Status
Exploitation requires user interaction (tapping on a malicious overlay) and physical/proximity access to the target device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin July 2021 patches
Vendor Advisory: https://source.android.com/security/bulletin/2021-07-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > Advanced > System update. 2. Install the July 2021 Android security patch. 3. Reboot the device after installation.
🔧 Temporary Workarounds
Disable Bluetooth when not in use
androidTurn off Bluetooth to prevent the device picker interface from being accessible to attackers.
Settings > Connected devices > Connection preferences > Bluetooth > Toggle off
Enable 'Draw over other apps' protection
androidRestrict which apps can draw over other apps to prevent overlay attacks.
Settings > Apps & notifications > Special app access > Display over other apps > Restrict unnecessary apps
🧯 If You Can't Patch
- Disable Bluetooth completely in device settings
- Educate users to be cautious when pairing Bluetooth devices and verify device names carefully
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Android version. If version is 8.1, 9, 10, or 11 without July 2021 security patches, device is vulnerable.Check Version:
Settings > About phone > Android versionVerify Fix Applied:
Check security patch level in Settings > About phone > Android security patch level. Verify it shows 'July 5, 2021' or later.📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth pairing events
- Multiple failed pairing attempts from unknown devices
Network Indicators:
- Unexpected Bluetooth connections from unfamiliar MAC addresses
SIEM Query:
Search for Bluetooth pairing events with suspicious device names or from unknown MAC addresses in device logs.