The activerecord-session_store (aka Active Record Session Store) component through 1.1.3 for Ruby on Rails does not use a constant-time approach when delivering information about whether a guessed session ID is valid. Consequently, remote attackers can leverage timing discrepancies to achieve a correct guess in a relatively short amount of time. This is a related issue to CVE-2019-16782.

Recommendation

This has been fixed in version 2.0.0. All users are advised to update to this version or later.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-25025
• rails/activerecord-session_store#151
• https://rubygems.org/gems/activerecord-session_store
• rails/activerecord-session_store@9d4dd11
• https://github.com/rails/activerecord-session_store/releases/tag/v2.0.0
• https://github.com/rubysec/ruby-advisory-db/blob/master/activerecord-session_store/CVE-2019-25025.yml