Android Security Code

• WebView Remote Code Execution
  • On API16 (Android 4.2) and previous systems, If you use the Webview.addjavascriptinterface method to implement a native Java interface through JavaScript calls, the system does not have any restrictions on the registered Java class method invocation, which could allow an attacker to invoke the vulnerability by using the Java Reflection API to execute arbitrary j Ava object to achieve the purpose of the attack. The vulnerability code for injecting Java object injectedobject into JavaScript is as follows:

      WebView WebView = new WebView (this);        Webview.getsettings (). Setjavascriptenabled (true);        Webview.addjavascriptinterface (This, "injectedobject");        Webview.loadurl ("http://www.asce1885.com/index.html");

  • The attacker's HTML page below gives you the GetRuntime method to execute a series of shell commands, whatever you like:

    <! DOCTYPE html>

• The solution to the vulnerability is as follows:
  • Api>16. Android-given solution using @javascriptinterface annotations on methods of Java classes
  • Api<=16 strongly recommends that you do not use the Addjavascriptinterface interface again, but instead use the Safe-java-js-webview-bridge function library
  • Remove the following default interface inside the Android system (this does not understand )

Android Security Code