https://git.ruby-lang.org/ruby.git/commit/?id=f98b3023bd

From f98b3023bd786b4e7dfdb94b573a5f5d3d37d145 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 1 Oct 2019 11:01:05 +0000
Subject: merge revision(s) 3ce238b5f9795581eb84114dcfbdf4aa086bfecc

WEBrick: prevent response splitting and header injection

This is a follow up to d9d4a28.
The commit prevented CRLR, but did not address an isolated CR or an
isolated LF.

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


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/lib/webrick/httpresponse.rb b/lib/webrick/httpresponse.rb
index 6d77692..d26324c 100644
--- a/lib/webrick/httpresponse.rb
+++ b/lib/webrick/httpresponse.rb
@@ -367,7 +367,8 @@ module WEBrick https://github.com/ruby/ruby/blob/trunk/lib/webrick/httpresponse.rb#L367
     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
diff --git a/test/webrick/test_httpresponse.rb b/test/webrick/test_httpresponse.rb
index 6263e0a..24a6968 100644
--- a/test/webrick/test_httpresponse.rb
+++ b/test/webrick/test_httpresponse.rb
@@ -29,7 +29,7 @@ module WEBrick https://github.com/ruby/ruby/blob/trunk/test/webrick/test_httpresponse.rb#L29
       @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 https://github.com/ruby/ruby/blob/trunk/test/webrick/test_httpresponse.rb#L39
       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 https://github.com/ruby/ruby/blob/trunk/test/webrick/test_httpresponse.rb#L50
       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_304_does_not_log_warning
       res.status      = 304
       res.setup_header
diff --git a/version.h b/version.h
index 91f84e7..62e6026 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.5.7"
 #define RUBY_RELEASE_DATE "2019-10-01"
-#define RUBY_PATCHLEVEL 204
+#define RUBY_PATCHLEVEL 205
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 10
-- 
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