Leakage of sensitive data in dynamic file generation

• Rule ID: ruby_lang_file_generation
• Languages: ruby
• Source: file_generation.yml

Description

It is not uncommon to generate logs, backups, or data exports to static file formats. This rule checks if code exists to write sensitive data to static files.

Remediations

❌ Avoid code like the following:

File.open("users.log", "w") { |f| f.write "#{Time.now} - User #{user.email} logged in\n" }
File.open("users.csv", "w") do |f|
  users.each do |user|
    f.write "#{user.email},#{user.first_name},#{user.last_name}"
  end
end

In instances where writing sensitive data is intentional, make sure to document its location according to your internal policies.

Associated CWE

• CWE-313: Cleartext Storage in a File or on Disk

OWASP Top 10

• A04:2021 - Insecure Design

Configuration

To skip this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --skip-rule=ruby_lang_file_generation

To run only this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --only-rule=ruby_lang_file_generation