File 0003-CVE-2020-15169.patch of Package rubygem-actionview-5_1.30716

From e5aa099a4e1b33d9f9699673c6f2f3be4dbc0f24 Mon Sep 17 00:00:00 2001
From: Jonathan Hefner <jonathan@hefner.pro>
Date: Tue, 8 Sep 2020 08:46:09 -0400
Subject: [PATCH] Fix XSS vulnerability in `translate` helper

Prior to this commit, when a translation key indicated that the
translation text was HTML, the value returned by `I18n.translate` would
always be marked as `html_safe`.  However, the value returned by
`I18n.translate` could be an untrusted value directly from
`options[:default]`.

This commit ensures values directly from `options[:default]` are not
marked as `html_safe`.
---
 .../lib/action_view/helpers/translation_helper.rb   | 13 ++++++++++++-
 actionview/test/template/translation_helper_test.rb |  7 +++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/actionview/lib/action_view/helpers/translation_helper.rb b/actionview/lib/action_view/helpers/translation_helper.rb
index 1860bc4732..27534abb7d 100644
--- a/actionview/lib/action_view/helpers/translation_helper.rb
+++ b/actionview/lib/action_view/helpers/translation_helper.rb
@@ -79,14 +79,22 @@ def translate(key, options = {})
 
         if html_safe_translation_key?(key)
           html_safe_options = options.dup
+
           options.except(*I18n::RESERVED_KEYS).each do |name, value|
             unless name == :count && value.is_a?(Numeric)
               html_safe_options[name] = ERB::Util.html_escape(value.to_s)
             end
           end
+
+          html_safe_options[:default] = MISSING_TRANSLATION unless html_safe_options[:default].blank?
+
           translation = I18n.translate(scope_key_by_partial(key), html_safe_options.merge(raise: i18n_raise))
 
-          translation.respond_to?(:html_safe) ? translation.html_safe : translation
+          if translation.equal?(MISSING_TRANSLATION)
+            options[:default].first
+          else
+            translation.respond_to?(:html_safe) ? translation.html_safe : translation
+          end
         else
           I18n.translate(scope_key_by_partial(key), options.merge(raise: i18n_raise))
         end
@@ -121,6 +129,9 @@ def localize(*args)
       alias :l :localize
 
       private
+        MISSING_TRANSLATION = Object.new
+        private_constant :MISSING_TRANSLATION
+
         def scope_key_by_partial(key)
           if key.to_s.first == "."
             if @virtual_path
-- 
2.27.0