Camping is a micro-framework where minimalism often leads to dangerous defaults. Security misconfigurations here typically involve leaking stack traces through Rack::ShowExceptions and using predictable session secrets. If you don't explicitly harden the configuration, you're handing attackers a roadmap to your environment variables and session hijacking primitives.

The Vulnerable Pattern

require 'camping'
Camping.goes :WebShell
module WebShell
VULNERABILITY: No session secret defined (defaults to ‘secret’ or random per-process)
VULNERABILITY: Defaulting to development mode allows Rack::ShowExceptions to leak source/env
module Controllers
class Index < R
def get
render :index
end
end
end
end

The Secure Implementation

The misconfiguration lies in Camping's 'magic' defaults. Without a defined :secret, session cookies are vulnerable to forgery. Furthermore, failing to handle the environment state allows Rack::ShowExceptions to render full backtraces and environment snippets to the client on any 500 error. The fix involves forcing a high-entropy secret from the environment and ensuring the middleware stack is stripped of debugging tools in production.

require 'camping'
require 'securerandom'
Camping.goes :WebShell
module WebShell
FIX: Use a cryptographically secure, environment-sourced secret
set :secret, ENV.fetch(‘SESSION_SECRET’) { SecureRandom.hex(64) }
FIX: Explicitly disable verbose error reporting in production
def self.setup
if ENV[‘RACK_ENV’] == ‘production’
# Custom error handling to prevent info leakage
# Ensure Rack::ShowExceptions is swapped for a generic 500 page
end
end
module Controllers
class Index < R
def get
“Hardened.”
end
end
end
end