Upgrading Ruby on Rails. If you require your cookies to be read by Rails 5.2. This is because cookies signed based on the new secretkeybase in Rails 4.x are. Ruby on Rails 5.2 Release NotesHighlights in Rails 5.2: Active Storage Redis Cache Store HTTP/2 Early Hints Credentials Content Security Policy These release notes cover only the major changes. To learn about various bug fixes and changes, please refer to the change logs or check out the list of commits in the main Rails repository on GitHub.
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If your application was not updated to Rails 5.2 defaults, the secretkeybase will be found in the old config/secrets.yml file. Note that changing your secretkeybase will invalidate all existing session. RandomKeygen is a free mobile-friendly tool that offers randomly generated keys and passwords you can use to secure any application, service or device. KEY RandomKeygen - The Secure Password & Keygen Generator.
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RCE on Rails 5.2.2 using a path traversal (CVE-2019-5418) and a deserialization of Ruby objects (CVE-2019-5420)
Technical Analysis:
- 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
Exploit
- The exploit check if the Rails application is vulnerable to the CVE-2019-5418
- Then gets the content of the files:
credentials.yml.enc
andmaster.key
- Decrypt the credentials.yml.enc and get the secret_key_base value
- Craft a request to the ressource
/rails/active_storage/disk/:encoded_key/*filename(.:format)
=> CVE-2019-5420 - Send the request to the vulnerable server
- The code is executed on the server
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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
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Fix of CVE-2019-5418
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