merge revision(s) 3ce238b5f9:

WEBrick: prevent response splitting and header injection

	This is a follow up to d9d4a28f1c.
	The commit prevented CRLR, but did not address an isolated CR or an
	isolated LF.

	Co-Authored-By: NARUSE, Yui <naruse@airemix.jp>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67808 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/webrick/httpresponse.rb

@@ -369,7 +369,8 @@ module WEBrick
     private
 
     def check_header(header_value)
-      if header_value =~ /\r\n/
+      header_value = header_value.to_s
+      if /[\r\n]/ =~ header_value
         raise InvalidHeader
       else
         header_value

test/webrick/test_httpresponse.rb

@@ -29,7 +29,7 @@ module WEBrick
       @res.keep_alive  = true
     end
 
-    def test_prevent_response_splitting_headers
+    def test_prevent_response_splitting_headers_crlf
       res['X-header'] = "malicious\r\nCookie: hack"
       io = StringIO.new
       res.send_response io
@@ -39,7 +39,7 @@ module WEBrick
       refute_match 'hack', io.string
     end
 
-    def test_prevent_response_splitting_cookie_headers
+    def test_prevent_response_splitting_cookie_headers_crlf
       user_input = "malicious\r\nCookie: hack"
       res.cookies << WEBrick::Cookie.new('author', user_input)
       io = StringIO.new
@@ -50,6 +50,48 @@ module WEBrick
       refute_match 'hack', io.string
     end
 
+    def test_prevent_response_splitting_headers_cr
+      res['X-header'] = "malicious\rCookie: hack"
+      io = StringIO.new
+      res.send_response io
+      io.rewind
+      res = Net::HTTPResponse.read_new(Net::BufferedIO.new(io))
+      assert_equal '500', res.code
+      refute_match 'hack', io.string
+    end
+
+    def test_prevent_response_splitting_cookie_headers_cr
+      user_input = "malicious\rCookie: hack"
+      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))
+      assert_equal '500', res.code
+      refute_match 'hack', io.string
+    end
+
+    def test_prevent_response_splitting_headers_lf
+      res['X-header'] = "malicious\nCookie: hack"
+      io = StringIO.new
+      res.send_response io
+      io.rewind
+      res = Net::HTTPResponse.read_new(Net::BufferedIO.new(io))
+      assert_equal '500', res.code
+      refute_match 'hack', io.string
+    end
+
+    def test_prevent_response_splitting_cookie_headers_lf
+      user_input = "malicious\nCookie: hack"
+      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))
+      assert_equal '500', res.code
+      refute_match 'hack', io.string
+    end
+
     def test_set_redirect_response_splitting
       url = "malicious\r\nCookie: hack"
       assert_raises(URI::InvalidURIError) do

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.6.5"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 112
+#define RUBY_PATCHLEVEL 113
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 10