Vulnerable sample for Action test

[souro1212]

This PR intentionally adds risky patterns for testing ai-secure-code-review-action.

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📥 Commits

Reviewing files that changed from the base of the PR and between a75527b and 8edcab7.

📒 Files selected for processing (1)

• app.rb (1 hunks)

✨ Finishing touches

• 📝 Generate Docstrings

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• Commit unit tests in branch feat/vuln-demo-1757571369

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[github-actions]

🔐 Secure Code Review (AI)

Risk Summary: High (3), Medium (1)

1. Finding: Potential for XSS

   • Why it matters: The use of ERB.new with untrusted input (params[:name]) can lead to Cross-Site Scripting (XSS) if the input is not properly sanitized or escaped.
   • Evidence (diff lines):

     ERB.new("Hello #{name}").result

   • Fix (concrete): Use Rack::Utils.escape_html(name) to escape the user input before rendering it in the ERB template:

     ERB.new("Hello #{Rack::Utils.escape_html(name)}").result

2. Finding: Unsafe YAML deserialization

   • Why it matters: Using YAML.load on untrusted input (params[:data]) can lead to arbitrary code execution or denial of service through YAML deserialization attacks.
   • Evidence (diff lines):

     YAML.load(data)

   • Fix (concrete): Replace YAML.load with YAML.safe_load to prevent loading arbitrary objects:

     YAML.safe_load(data)

3. Finding: Lack of input validation

   • Why it matters: There is no validation on the params[:name] and params[:data], which could lead to unexpected behavior or security vulnerabilities.
   • Evidence (diff lines):

     name = params[:name]
     data = params[:data]

   • Fix (concrete): Implement input validation to ensure that name and data conform to expected formats (e.g., length checks, type checks):

     halt 400, "Invalid name" unless name.is_a?(String) && name.length < 100
     halt 400, "Invalid data" unless data.is_a?(String) && data.length < 1000

Safeguards Checklist:

• Input validation: Fail
• Output encoding: Fail
• Safe deserialization: Fail
• Use of secure libraries: Pass

The diff is small and focused, but the identified issues pose significant security risks that need immediate attention.

---

Models can make mistakes. Verify before merging.

[secure-code-warrior-for-github]

Micro-Learning Topic: Cross-site scripting (Detected by phrase)

Matched on "Cross-Site Scripting"

Cross-site scripting vulnerabilities occur when unescaped input is rendered into a page displayed to the user. When HTML or script is included in the input, it will be processed by a user's browser as HTML or script and can alter the appearance of the page or execute malicious scripts in their user context.

Try a challenge in Secure Code Warrior

Helpful references

• Prevent Cross-Site Scripting (XSS) in ASP.NET Core - A detailed Microsoft article on how to prevent cross-site scripting in ASP.NET Core.
• OWASP Cross Site Scripting (XSS) Software Attack - OWASP community page with comprehensive information about cross site scripting, and links to various OWASP resources to help detect or prevent it.
• OWASP Cross Site Scripting Prevention Cheat Sheet - This article provides a simple positive model for preventing XSS using output encoding properly.

Micro-Learning Topic: Denial of service (Detected by phrase)

Matched on "denial of service"

The Denial of Service (DoS) attack is focused on making a resource (site, application, server) unavailable for the purpose it was designed. There are many ways to make a service unavailable for legitimate users by manipulating network packets, programming, logical, or resources handling vulnerabilities, among others. Source: https://www.owasp.org/index.php/Denial_of_Service

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Micro-Learning Topic: Deserialization attack (Detected by phrase)

Matched on "deserialization attack"

What is this? (2min video)

It is often convenient to serialize objects for communication or to save them for later use. However, serialized data or code can be modified. This malformed data or unexpected data could be used to abuse application logic, deny service, or execute arbitrary code when deserialized. This is usually done with "gadget chains

Try a challenge in Secure Code Warrior

Helpful references

• OWASP Deserialization Cheat Sheet - This cheatsheet is focused on providing clear, simple, actionable guidance for preventing deserialization flaws in your applications.
• OWASP Deserialization of untrusted data - OWASP community page with comprehensive information about deserialization vulnerabilities, and links to various OWASP resources to help detect or prevent it.
• OWASP Top Ten 2017 A8: Insecure Deserialization - OWASP Top Ten articles provide basic techniques to protect against these high risk problem areas, and guidance on where to go next.