From 17e6f1507b7f2c2a883c180f4f9548445d6dfbda Mon Sep 17 00:00:00 2001 From: Aaron Patterson Date: Thu, 29 Oct 2015 10:42:44 -0700 Subject: use secure string comparisons for basic auth username / password this will avoid timing attacks against applications that use basic auth. CVE-2015-7576 --- actionpack/lib/action_controller/metal/http_authentication.rb | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'actionpack/lib/action_controller/metal') diff --git a/actionpack/lib/action_controller/metal/http_authentication.rb b/actionpack/lib/action_controller/metal/http_authentication.rb index 2ac6e37e34..35be6d9300 100644 --- a/actionpack/lib/action_controller/metal/http_authentication.rb +++ b/actionpack/lib/action_controller/metal/http_authentication.rb @@ -1,4 +1,5 @@ require 'base64' +require 'active_support/security_utils' module ActionController # Makes it dead easy to do HTTP Basic, Digest and Token authentication. @@ -68,7 +69,11 @@ module ActionController def http_basic_authenticate_with(options = {}) before_action(options.except(:name, :password, :realm)) do authenticate_or_request_with_http_basic(options[:realm] || "Application") do |name, password| - name == options[:name] && password == options[:password] + # This comparison uses & so that it doesn't short circuit and + # uses `variable_size_secure_compare` so that length information + # isn't leaked. + ActiveSupport::SecurityUtils.variable_size_secure_compare(name, options[:name]) & + ActiveSupport::SecurityUtils.variable_size_secure_compare(password, options[:password]) end end end -- cgit v1.2.3