ruby-RCE-CVE-2019-5420-

Ruby Deserialization CVE-2019-5420 https://github.com/PenTestical/CVE-2019-5420 References: 1 Ruby on Rails command execution vulnerability payload implementation process https://hackerone.com/reports/473888 Since ActiveSupport::MessageVerifier and ActiveSupport::MessageEncryptor use Marshal as t...

Ruby on Rails: RCE which may occur due to `ActiveSupport::MessageVerifier` or `ActiveSupport::MessageEncryptor` (especially Active storage)

Since ActiveSupport::MessageVerifier and ActiveSupport::MessageEncryptor use Marshal as the default serializer, I confirmed that RCE is possible by object injection. ruby https://github.com/rails/rails/blob/v5.2.2/activesupport/lib/activesupport/messageverifier.rbL110 def initializesecret, option...