CVE-2024-40659
📋 TL;DR
This vulnerability allows a local attacker to permanently disable AndroidKeyStore key generation by manipulating attestation keys through improper input validation in RemoteProvisioningService. It affects Android devices with vulnerable versions of the Remote Key Provisioning module. No user interaction or elevated privileges are required for exploitation.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Permanent loss of AndroidKeyStore functionality on affected devices, preventing secure key generation and storage for all applications.
Likely Case
Local denial of service affecting cryptographic operations that rely on AndroidKeyStore, potentially breaking app functionality that requires secure key storage.
If Mitigated
Minimal impact if patched promptly; unpatched devices remain vulnerable to local attacks.
🎯 Exploit Status
Exploitation requires local access but no authentication; complexity involves understanding Android's RemoteProvisioningService.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin September 2024 patches
Vendor Advisory: https://source.android.com/security/bulletin/2024-09-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in device settings. 2. Apply the September 2024 security patch or later. 3. Reboot the device after installation.
🔧 Temporary Workarounds
Disable unnecessary apps
androidRemove or restrict apps that might exploit local vulnerabilities to reduce attack surface.
🧯 If You Can't Patch
- Restrict physical and local access to vulnerable devices to prevent exploitation.
- Monitor for unusual app behavior or cryptographic errors that might indicate exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version; if before September 2024, device may be vulnerable.Check Version:
On Android device: adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify that the Android security patch level is September 2024 or later in device settings.📡 Detection & Monitoring
Log Indicators:
- Log entries related to RemoteProvisioningService failures or unexpected attestation key updates in Android system logs.
Network Indicators:
- None - this is a local vulnerability with no network indicators.
SIEM Query:
Search for Android system logs containing 'RemoteProvisioningService' and error codes related to key generation or attestation.