Toby Hsieh

**Name of the Vulnerable Software and Affected Versions** Action View in Ruby on Rails versions 3.x through 3.2.15 Action View in Ruby on Rails versions 4.x through 4.0.1 **Description** The issue allows remote attackers to cause a denial of service, resulting in memory consumption, via a header containing an invalid MIME type that leads to excessive caching. This occurs due to a problem in `actionpack/lib/action view/lookup context.rb`. **Recommendations** For Action View in Ruby on Rails versions 3.x through 3.2.15, update to version 3.2.16 or later. For Action View in Ruby on Rails versions 4.x through 4.0.1, update to version 4.0.2 or later.

**Name of the Vulnerable Software and Affected Versions** Ruby on Rails versions prior to 3.2.16 Ruby on Rails versions 4.x prior to 4.0.2 **Description** The issue arises from improper consideration of differences in parameter handling between the Active Record component and the JSON implementation in `actionpack/lib/action dispatch/http/request.rb`. This allows remote attackers to bypass intended database-query restrictions, perform NULL checks, or trigger missing WHERE clauses via a crafted request. The request can leverage third-party Rack middleware or custom Rack middleware to exploit this issue. **Recommendations** For Ruby on Rails versions prior to 3.2.16, update to version 3.2.16 or later. For Ruby on Rails versions 4.x prior to 4.0.2, update to version 4.0.2 or later. As a temporary workaround, consider restricting access to custom Rack middleware and third-party Rack middleware until a patch is applied.