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CVE-2013-4164 is a heap-based buffer overflow in Ruby's conversion of strings to floating-point values. It affects Ruby 1.8; Ruby 1.9 releases before 1.9.3-p484; Ruby 2.0 releases before 2.0.0-p353; Ruby 2.1 releases before 2.1.0-preview2; and development trunk revisions before r43780. A crafted string supplied to floating-point conversion, including through String#to_f or JSON.parse, can corrupt heap memory.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit auxiliary module: 'modules/auxiliary/dos/http/rails_json_float_dos.rb'. The module targets a vulnerability in Ruby's floating point number parsing (CVE-2013-4164), which can be exploited via a Ruby on Rails application that processes JSON input. The exploit works by sending a specially crafted JSON array containing a very large floating point number as a string to the target endpoint (default '/'), causing a heap-based buffer overflow and crashing the Ruby process, resulting in a denial of service (DoS). The module allows customization of the HTTP verb and target URI. It is operational and has been tested against Ruby 1.9.3-p448 with WebRick and Thin web servers. The code is written in Ruby and is structured as a standard Metasploit auxiliary module, making use of the framework's HTTP client and DoS mixins. No hardcoded IPs or domains are present; the endpoint is user-supplied.
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