CVE-2021-0589
📋 TL;DR
This vulnerability allows local privilege escalation on Android devices through an out-of-bounds write in the Bluetooth stack. An attacker with user execution privileges can exploit this without user interaction to gain elevated system access. It affects multiple Android versions from 8.1 through 11.
💻 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
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 higher permissions than initially granted, enabling further system exploitation.
If Mitigated
Limited impact if devices are patched, have Bluetooth disabled, or run in restricted environments with minimal privileges.
🎯 Exploit Status
Exploitation requires user execution privileges but no user interaction. The vulnerability is in the Bluetooth stack's SCN allocation function.
🛠️ 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. Apply Android Security Update from July 2021 or later. 2. For OEM devices, install manufacturer-provided firmware updates. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Disable Bluetooth
androidTemporarily disable Bluetooth functionality to prevent exploitation through this vector
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Turn off
🧯 If You Can't Patch
- Restrict app installations to trusted sources only via Google Play Protect and device policies
- Implement application sandboxing and least privilege principles to limit potential damage from exploitation
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level in Settings > About phone > Android versionCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level is July 2021 or later in Settings > About phone > Android security update📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth stack crashes in system logs
- Unexpected privilege escalation attempts
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Look for system events indicating Bluetooth service crashes or unexpected process privilege changes