1 files changed, 40 insertions, 0 deletions
diff --git a/spec/ruby/security/cve_2017_17742_spec.rb b/spec/ruby/security/cve_2017_17742_spec.rb
new file mode 100644
index 0000000000..f1205412c6
--- /dev/null
+++ b/spec/ruby/security/cve_2017_17742_spec.rb
@@ -0,0 +1,40 @@
+require_relative '../spec_helper'
+
+require "webrick"
+require "stringio"
+require "net/http"
+
+guard -> {
+  ruby_version_is "2.3.7"..."2.4" or
+  ruby_version_is "2.4.4"..."2.5" or
+  ruby_version_is "2.5.1"
+} do
+  describe "WEBrick" do
+    describe "resists CVE-2017-17742" do
+      it "for a response splitting headers" do
+        config = WEBrick::Config::HTTP
+        res = WEBrick::HTTPResponse.new config
+        res['X-header'] = "malicious\r\nCookie: hack"
+        io = StringIO.new
+        res.send_response io
+        io.rewind
+        res = Net::HTTPResponse.read_new(Net::BufferedIO.new(io))
+        res.code.should == '500'
+        io.string.should_not =~ /hack/
+      end
+
+      it "for a response splitting cookie headers" do
+        user_input = "malicious\r\nCookie: hack"
+        config = WEBrick::Config::HTTP
+        res = WEBrick::HTTPResponse.new config
+        res.cookies << WEBrick::Cookie.new('author', user_input)
+        io = StringIO.new
+        res.send_response io
+        io.rewind
+        res = Net::HTTPResponse.read_new(Net::BufferedIO.new(io))
+        res.code.should == '500'
+        io.string.should_not =~ /hack/
+      end
+    end
+  end
+end