CVE-2023-40088
📋 TL;DR
This CVE describes a use-after-free vulnerability in Android's Bluetooth stack that could allow remote attackers to execute arbitrary code on affected devices without user interaction. The vulnerability affects Android devices with Bluetooth enabled, potentially allowing attackers in proximity to compromise devices. Memory corruption in the callback_thread_event function could lead to remote code execution.
💻 Affected Systems
- Android devices with Bluetooth functionality
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker executes arbitrary code with system privileges, potentially gaining full control of the device, accessing sensitive data, and establishing persistence.
Likely Case
Remote code execution leading to device compromise, data theft, or installation of malware via Bluetooth proximity attacks.
If Mitigated
With proper network segmentation and Bluetooth restrictions, impact limited to isolated network segments or prevented entirely.
🎯 Exploit Status
Exploitation requires proximity to target device and knowledge of Bluetooth protocol manipulation. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: December 2023 Android Security Bulletin patches
Vendor Advisory: https://source.android.com/security/bulletin/2023-12-01
Restart Required: Yes
Instructions:
1. Apply December 2023 Android security patches from device manufacturer. 2. Update Android OS to latest version. 3. Reboot device after update.
🔧 Temporary Workarounds
Disable Bluetooth
androidTurn off Bluetooth functionality to prevent exploitation
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Turn off
Restrict Bluetooth visibility
androidSet Bluetooth to non-discoverable mode to reduce attack surface
adb shell settings put global bluetooth_discoverability 0
Settings > Connected devices > Connection preferences > Bluetooth > Device name > Turn off visibility
🧯 If You Can't Patch
- Disable Bluetooth on all affected devices immediately
- Implement network segmentation to isolate Bluetooth-enabled devices from critical systems
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level: Settings > About phone > Android version > Security patch level. If before December 2023, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows December 2023 or later. Check Bluetooth service version matches patched version from Android source.📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth connection attempts
- Bluetooth service crashes in system logs
- Memory corruption errors in Bluetooth-related processes
Network Indicators:
- Suspicious Bluetooth protocol traffic patterns
- Unexpected Bluetooth pairing requests
SIEM Query:
source="android_system" AND (process="bluetooth" OR process="com.android.bluetooth") AND (event="crash" OR event="memory_error" OR event="use_after_free")🔗 References
- https://android.googlesource.com/platform/packages/modules/Bluetooth/+/5bfd817719fcf55cbb3476e6b5539a3db4c437fc
- https://source.android.com/security/bulletin/2023-12-01
- https://android.googlesource.com/platform/packages/modules/Bluetooth/+/5bfd817719fcf55cbb3476e6b5539a3db4c437fc
- https://source.android.com/security/bulletin/2023-12-01
