100 lines
3.0 KiB
Ruby
100 lines
3.0 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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class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Remote::HttpClient
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include Msf::Auxiliary::Scanner
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def initialize(info={})
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super(update_info(info,
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'Name' => 'Ruby on Rails JSON Processor YAML Deserialization Scanner',
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'Description' => %q{
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This module attempts to identify Ruby on Rails instances vulnerable to
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an arbitrary object instantiation flaw in the JSON request processor.
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},
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'Author' =>
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[
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'jjarmoc', # scanner module
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'hdm' # CVE-2013-0156 scanner, basis of this technique.
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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['CVE', '2013-0333']
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]
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))
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register_options([
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OptString.new('TARGETURI', [true, "The URI to test", "/"]),
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OptEnum.new('HTTP_METHOD', [true, 'HTTP Method', 'POST', ['GET', 'POST', 'PUT']]),
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], self.class)
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end
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def send_probe(pdata)
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res = send_request_cgi({
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'uri' => normalize_uri(datastore['TARGETURI']),
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'method' => datastore['HTTP_METHOD'],
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'ctype' => 'application/json',
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'data' => pdata
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})
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end
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def run_host(ip)
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# Straight JSON as a baseline
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res1 = send_probe(
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"{ \"#{Rex::Text.rand_text_alpha(rand(8)+1)}\" : \"#{Rex::Text.rand_text_alpha(rand(8)+1)}\" }"
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)
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unless res1
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vprint_status("#{rhost}:#{rport} No reply to the initial JSON request")
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return
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end
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if res1.code.to_s =~ /^[5]/
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vprint_error("#{rhost}:#{rport} The server replied with #{res1.code} for our initial JSON request, double check TARGETURI and HTTP_METHOD")
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return
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end
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# Deserialize a hash, this should work if YAML deserializes.
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res2 = send_probe("--- {}\n".gsub(':', '\u003a'))
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unless res2
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vprint_status("#{rhost}:#{rport} No reply to the initial YAML probe")
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return
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end
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# Deserialize a malformed object, inducing an error.
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res3 = send_probe("--- !ruby/object:\x00".gsub(':', '\u003a'))
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unless res3
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vprint_status("#{rhost}:#{rport} No reply to the second YAML probe")
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return
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end
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vprint_status("Probe response codes: #{res1.code} / #{res2.code} / #{res3.code}")
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if (res2.code == res1.code) and (res3.code != res2.code) and (res3.code != 200)
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# If first and second requests are the same, and the third is different but not a 200, we're vulnerable.
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print_good("#{rhost}:#{rport} is likely vulnerable due to a #{res3.code} reply for invalid YAML")
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report_vuln({
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:host => rhost,
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:port => rport,
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:proto => 'tcp',
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:name => self.name,
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:info => "Module triggered a #{res3.code} reply",
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:refs => self.references
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})
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else
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# Otherwise we're not likely vulnerable.
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vprint_status("#{rhost}:#{rport} is not likely to be vulnerable or TARGETURI & HTTP_METHOD must be set")
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end
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end
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end
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