CVE-2023-20973
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in Android's Bluetooth stack that could allow local information disclosure. Attackers with system execution privileges could potentially read memory beyond intended boundaries. Only Android 13 devices are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
System-level attacker could read sensitive memory contents, potentially exposing cryptographic keys, authentication tokens, or other privileged data.
Likely Case
Local attacker with system privileges could read limited memory contents, potentially exposing some system information but not full system compromise.
If Mitigated
With proper privilege separation and SELinux policies, impact is limited to information disclosure within Bluetooth subsystem context.
🎯 Exploit Status
Requires system execution privileges and knowledge of Bluetooth stack internals. No user interaction needed.
🛠️ 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. Reboot device after installation.
🔧 Temporary Workarounds
Disable Bluetooth when not needed
androidReduces attack surface by disabling Bluetooth functionality
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Toggle off
🧯 If You Can't Patch
- Restrict system privileges to trusted applications only
- Implement strict SELinux policies to limit Bluetooth service capabilities
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level: Settings > About phone > Android version and Security updateCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Security Patch Level is June 2023 or later: Settings > About phone > Android version > Security update📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth stack crashes in system logs
- Multiple failed Bluetooth connection attempts with unusual parameters
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="android_system" AND (process="bluetooth" OR process="btm") AND (event="crash" OR event="exception")