CVE-2023-21201
📋 TL;DR
This vulnerability in Android's Bluetooth stack allows remote attackers to cause denial of service via an out-of-bounds read. Attackers can exploit this without user interaction or elevated privileges. 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
Remote attacker crashes Bluetooth service, potentially causing system instability or requiring device reboot to restore Bluetooth functionality.
Likely Case
Bluetooth service crashes, disrupting Bluetooth connectivity until service restart or device reboot.
If Mitigated
With proper patching, no impact; Bluetooth functions normally with security fix applied.
🎯 Exploit Status
No authentication required, but attacker must be within Bluetooth range. Exploit requires sending malformed Bluetooth SDP packets.
🛠️ 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 June 2023 or later Android security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable Bluetooth
androidTemporarily disable Bluetooth to prevent exploitation until patch can be applied
Settings > Connected devices > Connection preferences > Bluetooth > Toggle off
🧯 If You Can't Patch
- Disable Bluetooth when not in use, especially in public or untrusted environments
- Implement network segmentation to limit Bluetooth device exposure to trusted networks only
🔍 How to Verify
Check if Vulnerable:
Check Android version: Settings > About phone > Android version = 13 AND Security patch level earlier than June 2023Check Version:
adb shell getprop ro.build.version.release && adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Security patch level is June 2023 or later: Settings > About phone > Android security update📡 Detection & Monitoring
Log Indicators:
- Bluetooth service crashes in logcat
- SDP server error messages
- Bluetooth stack restart events
Network Indicators:
- Unusual Bluetooth SDP packet patterns
- Multiple Bluetooth connection attempts from same device
SIEM Query:
source="android_logcat" AND ("btif_sdp_server" OR "Bluetooth crash" OR "SDP error")