CVE-2023-21223
📋 TL;DR
This vulnerability allows remote attackers to read memory beyond intended boundaries in Android's LPP (LTE Positioning Protocol) component, potentially exposing sensitive information. It affects Android devices with vulnerable kernel versions, requiring no user interaction or special privileges for exploitation.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker could read sensitive kernel memory, potentially exposing cryptographic keys, authentication tokens, or other protected data leading to further system compromise.
Likely Case
Information disclosure of limited kernel memory contents, potentially revealing device identifiers, location data, or other system information.
If Mitigated
No impact if patched; unpatched devices remain vulnerable to information disclosure but with limited scope due to memory layout protections.
🎯 Exploit Status
No authentication required but requires LTE positioning protocol interaction; no public exploit code known
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: June 2023 Android security patch level
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 June 2023 security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable LTE Positioning
androidTurn off LTE-based location services to prevent exploitation via LPP protocol
Settings > Location > Location services > Google Location Accuracy > Turn off
🧯 If You Can't Patch
- Disable LTE positioning services in device settings
- Use network-level filtering to block LPP protocol traffic if possible
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version > Security patch levelCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows June 2023 or later date📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs, abnormal LPP protocol activity in radio logs
Network Indicators:
- Unusual LPP protocol traffic patterns, unexpected positioning requests
SIEM Query:
source="android_kernel" AND ("LPP" OR "GNSS") AND ("out of bounds" OR "OOB")