CVE-2023-20989
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in Android's Bluetooth Low Energy (BLE) 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 the specific vulnerable component are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Privileged attacker could read sensitive system memory, potentially exposing cryptographic keys, authentication tokens, or other protected data from adjacent memory locations.
Likely Case
Limited information disclosure of non-critical system data due to memory layout constraints and exploit complexity.
If Mitigated
Minimal impact as the vulnerability requires system privileges and only affects specific Android 13 builds.
🎯 Exploit Status
Exploitation requires system execution privileges and knowledge of memory layout. No public exploits have been reported.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin June 2023 patches
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. 3. Reboot device after installation completes.
🔧 Temporary Workarounds
Disable Bluetooth when not in use
androidReduces attack surface by disabling the vulnerable BLE component
adb shell settings put global bluetooth_on 0
Restrict system app permissions
androidLimit which apps have system-level privileges
adb shell pm revoke <package_name> android.permission.ACCESS_BLUETOOTH_SHARE
🧯 If You Can't Patch
- Implement strict app vetting and only install apps from trusted sources
- Use mobile device management (MDM) to enforce security policies and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Android build fingerprint: Settings > About phone > Build number. Compare against vulnerable builds in the June 2023 bulletin.Check Version:
adb shell getprop ro.build.fingerprintVerify Fix Applied:
Verify security patch level is June 2023 or later: Settings > Security > Security update.📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth stack crashes in logcat
- Multiple failed BLE connection attempts from system processes
Network Indicators:
- Abnormal BLE packet patterns from system processes
SIEM Query:
source="android_logs" AND ("btm_ble" OR "BluetoothGatt") AND ("segmentation fault" OR "out of bounds")