CVE-2023-40094
📋 TL;DR
This vulnerability allows an attacker to bypass the lock screen on Android devices without needing any special permissions or user interaction. It affects Android devices running vulnerable versions, potentially enabling local privilege escalation.
💻 Affected Systems
- Android
📦 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
An attacker with physical access could unlock the device, access sensitive data, install malware, or gain elevated privileges without the user's knowledge.
Likely Case
Local attacker bypasses lock screen to access apps and data on the device, though may be limited by other security controls.
If Mitigated
With proper patching, the vulnerability is eliminated; without patching, device encryption and other security features may still protect some data.
🎯 Exploit Status
Exploitation requires local access but no authentication or user interaction; technical details are in the Android source code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: December 2023 Android Security Patch Level or later
Vendor Advisory: https://source.android.com/security/bulletin/2023-12-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install the December 2023 or later security patch. 3. Reboot the device after installation.
🔧 Temporary Workarounds
Disable lock screen (not recommended)
androidRemoving the lock screen eliminates the bypass vulnerability but severely reduces device security.
🧯 If You Can't Patch
- Restrict physical access to devices; keep them in secure locations when not in use.
- Enable full device encryption and remote wipe capabilities to protect data if device is compromised.
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level in Settings > About phone > Android version. If patch level is before December 2023, device is likely vulnerable.Check Version:
No single command; use device settings as above.Verify Fix Applied:
Verify the security patch level is December 2023 or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- Unusual lock screen bypass events in system logs, but exploitation may leave minimal traces.
Network Indicators:
- None - this is a local attack with no network activity.
SIEM Query:
Not applicable for network-based detection; focus on physical security monitoring.🔗 References
- https://android.googlesource.com/platform/frameworks/base/+/1120bc7e511710b1b774adf29ba47106292365e7
- https://source.android.com/security/bulletin/2023-12-01
- https://android.googlesource.com/platform/frameworks/base/+/1120bc7e511710b1b774adf29ba47106292365e7
- https://source.android.com/security/bulletin/2023-12-01
