CVE-2023-20980
📋 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 without user interaction. 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 server process, potentially exposing cryptographic keys, authentication tokens, or other protected data.
Likely Case
Limited information disclosure from the Bluetooth stack memory, potentially revealing device identifiers, connection parameters, or other Bluetooth-related data.
If Mitigated
With proper privilege separation and Bluetooth disabled, the attack surface is eliminated.
🎯 Exploit Status
Requires system privileges and knowledge of Bluetooth stack internals. No public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2023-06-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2023-06-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Install the June 2023 security patch or later. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable Bluetooth
androidTurn off Bluetooth to eliminate the attack surface completely
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Turn off
Restrict system privileges
androidLimit apps and services with system execution privileges
🧯 If You Can't Patch
- Disable Bluetooth when not in use to eliminate attack surface
- Implement strict app vetting and privilege separation to prevent malicious apps from obtaining system privileges
🔍 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 > Android version > Security update level📡 Detection & Monitoring
Log Indicators:
- Bluetooth stack crashes or unusual Bluetooth service behavior in system logs
Network Indicators:
- Unusual Bluetooth connection parameter updates or malformed Bluetooth packets
SIEM Query:
source="android_system" AND (process="bluetooth" OR process="btu") AND (event="crash" OR event="exception")