[Security] Bump activesupport from 5.2.3 to 5.2.6

[dependabot-preview]

Bumps activesupport from 5.2.3 to 5.2.6. This update includes a security fix.

Vulnerabilities fixed

Sourced from The Ruby Advisory Database.

Potentially unintended unmarshalling of user-provided objects in MemCacheStore and RedisCacheStore There is potentially unexpected behaviour in the MemCacheStore and RedisCacheStore where, when untrusted user input is written to the cache store using the raw: true parameter, re-reading the result from the cache can evaluate the user input as a Marshalled object instead of plain text. Vulnerable code looks like:

data = cache.fetch("demo", raw: true) { untrusted_string }

Versions Affected: rails < 5.2.5, rails < 6.0.4 Not affected: Applications not using MemCacheStore or RedisCacheStore. Applications that do not use the raw option when storing untrusted user input. Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1

Impact

Unmarshalling of untrusted user input can have impact up to and including RCE. At a minimum, this vulnerability allows an attacker to inject untrusted Ruby objects into a web application.

In addition to upgrading to the latest versions of Rails, developers should ensure that whenever they are calling Rails.cache.fetch they are using consistent values of the raw parameter for both

... (truncated)

Patched versions: ~> 5.2.4, >= 5.2.4.3; >= 6.0.3.1 Unaffected versions: none

Release notes

Sourced from activesupport's releases.

5.2.6

Active Support

• No changes.

Active Model

• No changes.

Active Record

• No changes.

Action View

• No changes.

Action Pack

• Accept base64_urlsafe CSRF tokens to make forward compatible.

  Base64 strict-encoded CSRF tokens are not inherently websafe, which makes them difficult to deal with. For example, the common practice of sending the CSRF token to a browser in a client-readable cookie does not work properly out of the box: the value has to be url-encoded and decoded to survive transport.

  In this version, we generate Base64 urlsafe-encoded CSRF tokens, which are inherently safe to transport. Validation accepts both urlsafe tokens, and strict-encoded tokens for backwards compatibility.

  How the tokes are encoded is controllr by the action_controller.urlsafe_csrf_tokens config.

  In Rails 5.2.5, the CSRF token format was accidentally changed to urlsafe-encoded.

  Atention: If you already upgraded your application to 5.2.5, set the config urlsafe_csrf_tokens to true, otherwise your form submission will start to fail during the deploy of this new version.

  Rails.application.config.action_controller.urlsafe_csrf_tokens = true

... (truncated)

Commits

• 4866154 Preparing for 5.2.6 release
• 4d68f67 Merge branch '5-2-sec' into 5-2-stable
• 2612683 Preparing for 5.2.4.6 release
• 9df84af Update changelog
• cb0a558 v5.2.5
• 6de08e5 Merge branch '5-2-sec' into 5-2-stable
• dc7364b Preparing for 5.2.4.5 release
• 6d8ed35 Merge branch '5-2-4-4' into 5-2-stable
• 404ad9e v5.2.4.4
• 47b3bc1 Fix test_two_classes_autoloading failure
• Additional commits viewable in compare view

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