Merge pull request from GHSA-w978-rmpf-qmwg

Author: oreoshake

lib/secure_headers/headers/content_security_policy.rb

@@ -140,11 +140,11 @@ def build_source_list_directive(directive)
       if source_list != OPT_OUT && source_list && source_list.any?
         minified_source_list = minify_source_list(directive, source_list).join(" ")
 
-        if minified_source_list.include?(";")
-          Kernel.warn("#{directive} contains a ; in '#{minified_source_list}' which will raise an error in future versions. It has been replaced with a blank space.")
+        if minified_source_list =~ /(\n|;)/
+          Kernel.warn("#{directive} contains a #{$1} in #{minified_source_list.inspect} which will raise an error in future versions. It has been replaced with a blank space.")
         end
 
-        escaped_source_list = minified_source_list.gsub(";", " ")
+        escaped_source_list = minified_source_list.gsub(/[\n;]/, " ")
         [symbol_to_hyphen_case(directive), escaped_source_list].join(" ").strip
       end
     end

spec/lib/secure_headers/headers/content_security_policy_spec.rb

@@ -29,10 +29,15 @@ module SecureHeaders
       end
 
       it "deprecates and escapes semicolons in directive source lists" do
-        expect(Kernel).to receive(:warn).with("frame_ancestors contains a ; in 'google.com;script-src *;.;' which will raise an error in future versions. It has been replaced with a blank space.")
+        expect(Kernel).to receive(:warn).with(%(frame_ancestors contains a ; in "google.com;script-src *;.;" which will raise an error in future versions. It has been replaced with a blank space.))
         expect(ContentSecurityPolicy.new(frame_ancestors: %w(https://google.com;script-src https://*;.;)).value).to eq("frame-ancestors google.com script-src * .")
       end
 
+      it "deprecates and escapes semicolons in directive source lists" do
+        expect(Kernel).to receive(:warn).with(%(frame_ancestors contains a \n in "\\nfoo.com\\nhacked" which will raise an error in future versions. It has been replaced with a blank space.))
+        expect(ContentSecurityPolicy.new(frame_ancestors: ["\nfoo.com\nhacked"]).value).to eq("frame-ancestors  foo.com hacked")
+      end
+
       it "discards 'none' values if any other source expressions are present" do
         csp = ContentSecurityPolicy.new(default_opts.merge(child_src: %w('self' 'none')))
         expect(csp.value).not_to include("'none'")