[Snyk] Fix for 1 vulnerabilities

[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
	416/1000 Why? Recently disclosed, Has a fix available, CVSS 2.6	XML External Entity (XXE) Injection SNYK-RUBY-NOKOGIRI-1055008	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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[secure-code-warrior-for-github]

Micro-Learning Topic: XML External Entities (XXE) (Detected by phrase)

What is this? (2min video)

An XML External Entity attack is a type of attack against an application that parses XML input. This attack occurs when XML input containing a reference to an external entity is processed by a weakly configured XML parser. This attack may lead to the disclosure of confidential data, denial of service, server-side request forgery, port scanning from the perspective of the machine where the parser is located, and other system impacts.

Identify code where user-supplied XML is being processed and the parser does not have external entity processing disabled. The configuration should be as basic as possible e.g. no external DTD validation, to prevent this vulnerability being exploited. Refer to the OWASP XXE Cheat Sheet for your own language and library.

Try this challenge in Secure Code Warrior