[Snyk] Security upgrade redcarpet from 3.5.0 to 3.5.1

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • Gemfile

⚠️ Warning

Failed to update the Gemfile.lock, please update manually before merging.

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	701/1000 Why? Recently disclosed, Has a fix available, CVSS 8.3	Cross-site Scripting (XSS) SNYK-RUBY-REDCARPET-1059089	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

---

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📚 Read more about Snyk's upgrade and patch logic

[secure-code-warrior-for-github]

Micro-Learning Topic: Reflected Cross-Site Scripting (Detected by phrase)

What is this? (2min video)

Reflected cross-site scripting vulnerabilities occur when unescaped input is displayed in the resulting 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.

Find the instances in the application where external input is displayed to users. Try to trace each value all the way from input to display and work out if any escaping or encoding is applied to prevent these values from being treated as raw HTML or script once it is written to the page. Pay special attention to the context of where the values are being written into a page as different contexts may have different encoding requirements. For example, a value written into a HTML tag attribute will require different encoding to a value written into a HTML tag value.

Try this challenge in Secure Code Warrior

Micro-Learning Topic: Cross-Site Scripting (XSS) (Detected by phrase)

XSS flaws occur whenever an application includes untrusted data in a new web page without proper validation or escaping, or updates an existing web page with user-supplied data using a browser API that can create HTML or JavaScript. XSS allows attackers to execute scripts in the victim’s browser which can hijack user sessions, deface web sites, or redirect the user to malicious sites.

Credits: OWASP Top 10 2017

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