Monkey patch for CVE-2012-2695 on Rails 2.3.14

fix_sql_injection.rb

# Monkey patch for CVE-2012-2695 on Rails 2.3.14
# put this file in your config/initializers directory
# comments/corrections: https://gist.github.com/2921706

# Ruby on Rails SQL Injection
# based on a patch from @presidentbeef
# https://rubyonrails-security.googlegroups.com/attach/aee3413fb038bf56/2-3-sql-injection.patch?view=1&part=3

module ActiveRecord
  class Base
    class << self # Class methods
      protected
        def sanitize_sql_hash_for_conditions(attrs, default_table_name = quoted_table_name, top_level = true)
          attrs = expand_hash_conditions_for_aggregates(attrs)

          conditions = attrs.map do |attr, value|
            table_name = default_table_name

            if not value.is_a?(Hash)
              attr = attr.to_s

              # Extract table name from qualified attribute names.
              if attr.include?('.') and top_level
                attr_table_name, attr = attr.split('.', 2)
                attr_table_name = connection.quote_table_name(attr_table_name)
              else
                attr_table_name = table_name
              end

              attribute_condition("#{attr_table_name}.#{connection.quote_column_name(attr)}", value)
            elsif top_level
              sanitize_sql_hash_for_conditions(value, connection.quote_table_name(attr.to_s), false)
            else
              raise ActiveRecord::StatementInvalid
            end
          end.join(' AND ')

          replace_bind_variables(conditions, expand_range_bind_variables(attrs.values))
        end
        alias_method :sanitize_sql_hash, :sanitize_sql_hash_for_conditions
    end
  end
end