CVE-2023-20987
📋 TL;DR
This vulnerability allows local information disclosure via Bluetooth on Android 13 devices. An attacker with system execution privileges can read memory beyond intended bounds without user interaction, potentially exposing sensitive data. Only Android 13 devices with Bluetooth enabled are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker with system privileges could read sensitive memory contents from the Bluetooth stack, potentially exposing cryptographic keys, authentication tokens, or other protected data.
Likely Case
Limited information disclosure of non-critical Bluetooth stack data to a privileged local attacker, with minimal practical impact on most users.
If Mitigated
No impact if Bluetooth is disabled or device is patched; minimal risk if proper privilege separation is maintained.
🎯 Exploit Status
Requires system execution privileges, making exploitation more difficult than user-level vulnerabilities. No public exploit code known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level June 2023 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2023-06-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install Android Security Patch Level June 2023 or later. 3. Restart device after installation.
🔧 Temporary Workarounds
Disable Bluetooth
androidTurn off Bluetooth to prevent exploitation of this vulnerability
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Toggle off
🧯 If You Can't Patch
- Restrict Bluetooth usage to trusted devices only
- Monitor for suspicious Bluetooth activity and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level: Settings > About phone > Android version and Security update levelCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level is June 2023 or later: Settings > About phone > Security update level📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth stack errors or crashes in system logs
- Multiple failed Bluetooth connection attempts from privileged processes
Network Indicators:
- Suspicious Bluetooth pairing attempts from system-level processes
SIEM Query:
source="android_system" AND (process="bluetooth" OR process="btm_acl") AND (error="out_of_bounds" OR error="memory_access")