1 files changed, 25 insertions, 0 deletions
diff --git a/spec/support/shared_examples/requests/uploads_actions_shared_examples.rb b/spec/support/shared_examples/requests/uploads_actions_shared_examples.rb
new file mode 100644
index 00000000000..41613fa9871
--- /dev/null
+++ b/spec/support/shared_examples/requests/uploads_actions_shared_examples.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+RSpec.shared_examples 'uploads actions' do
+  describe "GET #show" do
+    context 'with file traversal in filename parameter' do
+      # Uploads in tests are stored in directories like:
+      # tmp/tests/public/uploads/@hashed/AB/CD/ABCD/SECRET
+      let(:filename) { "../../../../../../../../../Gemfile.lock" }
+      let(:escaped_filename) { CGI.escape filename }
+
+      it 'responds with status 400' do
+        # Check files do indeed exists
+        upload_absolute_path = Pathname(upload.absolute_path)
+        expect(upload_absolute_path).to be_exist
+        attacked_file_path = upload_absolute_path.dirname.join(filename)
+        expect(attacked_file_path).to be_exist
+
+        # Need to escape, otherwise we get `ActionController::UrlGenerationError Exception: No route matches`
+        get show_path.sub(File.basename(upload.path), escaped_filename)
+
+        expect(response).to have_gitlab_http_status(:bad_request)
+      end
+    end
+  end
+end