Rails 5.2 Generate Secret Key Base

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The combination of config/secrets.yml, config/secrets.yml.enc, and SECRETKEYBASE made it so it wasn’t clear where secrets should be stored and what the relevance of SECRETKEYBASE was 2. A New Beginning. With this confusion in mind, Rails released version 5.2 and created an entirely new way to store your secret credentials that I will. If one created Rails 5.1 app and then updated to 5.2, `secretkeybase` defined in `config/secrets.yml` is ignored for `development` and `test` environment. A change in `secretkeybase` in turn breaks `Rails.application.keygenerator`. If one encrypt data in Rails 5.1, she cannot decrypt it in Rails 5.2 for `development` and `test` environment. If one created Rails 5.1 app and then updated to 5.2, `secretkeybase` defined in `config/secrets.yml` is ignored for `development` and `test` environment. A change in `secretkeybase` in turn breaks `Rails.application.keygenerator`. If one encrypt data in Rails 5.1, she cannot decrypt it in Rails 5.2 for `development` and `test` environment. Apr 10, 2017  0 Question Getting 'Missing `secretkeybase` for 'production' environment' when trying to get Unicorn to work with Rails.

RCE on Rails 5.2.2 using a path traversal (CVE-2019-5418) and a deserialization of Ruby objects (CVE-2019-5420)

Technical Analysis:

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  • CVE-2019-5418 - https://github.com/mpgn/CVE-2019-5418
  • CVE-2019-5420 - https://hackerone.com/reports/473888

Security Adivsory:

  • CVE-2019-5418 - https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q
  • CVE-2019-5420 - https://groups.google.com/forum/#!searchin/rubyonrails-security/CVE-2019-5420
Rails 5.2 Generate Secret Key Base

Rails 5.2 Generate Secret Key Base Number

Exploit

  1. The exploit check if the Rails application is vulnerable to the CVE-2019-5418
  2. Then gets the content of the files: credentials.yml.enc and master.key
  3. Decrypt the credentials.yml.enc and get the secret_key_base value
  4. Craft a request to the ressource /rails/active_storage/disk/:encoded_key/*filename(.:format) => CVE-2019-5420
  5. Send the request to the vulnerable server
  6. The code is executed on the server

Mitigations

  • You may notice the cache level is disabled on the exploit, but you can use a race condition to retrieve the two files: https://gist.github.com/snyff/04c3463845480632a1fe192308c31439#file-race_condition-sh

Fix of CVE-2019-5420

Secret Key Pokemon

Fix of CVE-2019-5418Matlab r2013a activation key generator.