CVE-2013-6417

actionpack/lib/action_dispatch/http/request.rb in Ruby on Rails before
3.2.16 and 4.x before 4.0.2 does not properly consider differences in
parameter handling between the Active Record component and the JSON
implementation, which allows remote attackers to bypass intended
database-query restrictions and perform NULL checks or trigger missing
WHERE clauses via a crafted request that leverages (1) third-party Rack
middleware or (2) custom Rack middleware. NOTE: this vulnerability exists
because of an incomplete fix for CVE-2013-0155.

Notes