CVE-2023-21059
📋 TL;DR
This vulnerability allows remote attackers to read memory beyond intended boundaries in Android's LPP_LcsManagement component, potentially disclosing sensitive information without user interaction. It affects Android devices running vulnerable kernel versions, primarily impacting mobile devices and potentially IoT devices using Android.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains unauthorized access to sensitive device memory contents, potentially exposing authentication tokens, encryption keys, or other protected data.
Likely Case
Information disclosure of limited memory contents, potentially revealing device identifiers, location data, or other telemetry information.
If Mitigated
No impact if patched; limited information exposure if network segmentation prevents external access.
🎯 Exploit Status
No authentication required, but exploitation requires understanding of LPP protocol and memory layout.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2023 Android security patch level or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2023-03-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install March 2023 or later security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Network segmentation
allRestrict network access to vulnerable devices to prevent remote exploitation
Disable unnecessary services
androidDisable LPP/LCS services if not required for device functionality
🧯 If You Can't Patch
- Isolate vulnerable devices on separate network segments with strict firewall rules
- Implement network monitoring for unusual LPP protocol traffic patterns
🔍 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 March 2023 or later date📡 Detection & Monitoring
Log Indicators:
- Kernel crash logs
- Memory access violation logs in system logs
Network Indicators:
- Unusual LPP protocol traffic patterns
- Unexpected memory read requests
SIEM Query:
source="android_system" AND (event_type="kernel_panic" OR message="*out of bounds*" OR message="*EUTRAN_LCS*")