Sensitive data detected as part of a 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-532: Insertion of Sensitive Information into Log File
• CWE-313: Cleartext Storage in a File or on Disk

OWASP Top 10

• A04:2021 - Insecure Design
• A09:2021 - Security Logging and Monitoring Failures

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