CVE-2025-48639
📋 TL;DR
This CVE describes a tapjacking/overlay vulnerability in Android's DefaultTransitionHandler that allows malicious apps to trick users into granting permissions unknowingly. Attackers can overlay deceptive UI elements over legitimate permission prompts, leading to local privilege escalation without requiring additional execution privileges. This affects Android devices where users interact with permission dialogs.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise where attackers gain all permissions of targeted apps, potentially accessing sensitive data, camera, microphone, location, contacts, and other protected resources.
Likely Case
Targeted permission escalation where attackers gain specific permissions (like camera, microphone, or storage access) to steal sensitive data or enable further attacks.
If Mitigated
Limited impact with proper user awareness and security controls, potentially resulting in only minor permission grants that don't lead to significant data exposure.
🎯 Exploit Status
Exploitation requires user interaction and a malicious app with overlay capabilities; not remotely exploitable without user action.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security updates from December 2025
Vendor Advisory: https://source.android.com/security/bulletin/2025-12-01
Restart Required: Yes
Instructions:
1. Check for Android security updates in Settings > System > System update. 2. Install December 2025 security patch. 3. Restart device after installation.
🔧 Temporary Workarounds
Disable overlay permissions for untrusted apps
androidPrevent apps from drawing over other apps to block tapjacking vectors
Settings > Apps > [App Name] > Advanced > Draw over other apps > Don't allow
Enable Google Play Protect
androidUse built-in malware scanning to detect malicious apps attempting tapjacking
Settings > Security > Google Play Protect > Scan device for security threats
🧯 If You Can't Patch
- Educate users to be cautious with permission dialogs and verify app legitimacy before granting permissions
- Implement mobile device management (MDM) policies to restrict app installations and overlay permissions
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level in Settings > About phone > Android versionCheck Version:
Settings > About phone > Android versionVerify Fix Applied:
Verify security patch level includes December 2025 or later in Settings > About phone > Android security patch level📡 Detection & Monitoring
Log Indicators:
- Unusual permission grants in app logs
- Multiple overlay permission requests from same app
Network Indicators:
- None - local attack only
SIEM Query:
app_permission_granted AND overlay_window_detected AND suspicious_timing