Merge branch 'open-redirect-fix-continue-to' into 'security'

Fix for open redirect vuln involving continue[to] params

See merge request !2083

app/controllers/concerns/continue_params.rb

@@ -7,6 +7,7 @@ module ContinueParams
 
     continue_params = continue_params.permit(:to, :notice, :notice_now)
     return unless continue_params[:to] && continue_params[:to].start_with?('/')
+    return if continue_params[:to].start_with?('//')
 
     continue_params
   end

changelogs/unreleased/open-redirect-continue-params.yml

+---
+title: Fix for open redirect vulnerability using continue[to] in URL when requesting project import status.
+merge_request: 
+author:

spec/controllers/projects/imports_controller_spec.rb

@@ -96,12 +96,19 @@ describe Projects::ImportsController do
             }
           end
 
-          it 'redirects to params[:to]' do
+          it 'redirects to internal params[:to]' do
             get :show, namespace_id: project.namespace.to_param, project_id: project, continue: params
 
             expect(flash[:notice]).to eq params[:notice]
             expect(response).to redirect_to params[:to]
           end
+
+          it 'does not redirect to external params[:to]' do
+            params[:to] = "//google.com"
+
+            get :show, namespace_id: project.namespace.to_param, project_id: project, continue: params
+            expect(response).not_to redirect_to params[:to]
+          end
         end
       end