Fix StartTLS stripping vulnerability

Reported by Alexandr Savca in https://hackerone.com/reports/1178562

Co-authored-by: Shugo Maeda <shugo@ruby-lang.org>

lib/net/imap.rb

@@ -1216,12 +1216,14 @@ module Net
       end
       resp = @tagged_responses.delete(tag)
       case resp.name
+      when /\A(?:OK)\z/ni
+        return resp
       when /\A(?:NO)\z/ni
         raise NoResponseError, resp
       when /\A(?:BAD)\z/ni
         raise BadResponseError, resp
       else
-        return resp
+        raise UnknownResponseError, resp
       end
     end
 
@@ -3717,6 +3719,10 @@ module Net
     class ByeResponseError < ResponseError
     end
 
+    # Error raised upon an unknown response from the server.
+    class UnknownResponseError < ResponseError
+    end
+
     RESPONSE_ERRORS = Hash.new(ResponseError)
     RESPONSE_ERRORS["NO"] = NoResponseError
     RESPONSE_ERRORS["BAD"] = BadResponseError

test/net/imap/test_imap.rb

@@ -127,6 +127,16 @@ class IMAPTest < Test::Unit::TestCase
         imap.disconnect
       end
     end
+
+    def test_starttls_stripping
+      starttls_stripping_test do |port|
+        imap = Net::IMAP.new("localhost", :port => port)
+        assert_raise(Net::IMAP::UnknownResponseError) do
+          imap.starttls(:ca_file => CA_FILE)
+        end
+        imap
+      end
+    end
   end
 
   def start_server
@@ -784,6 +794,27 @@ EOF
     end
   end
 
+  def starttls_stripping_test
+    server = create_tcp_server
+    port = server.addr[1]
+    start_server do
+      sock = server.accept
+      begin
+        sock.print("* OK test server\r\n")
+        sock.gets
+        sock.print("RUBY0001 BUG unhandled command\r\n")
+      ensure
+        sock.close
+        server.close
+      end
+    end
+    begin
+      imap = yield(port)
+    ensure
+      imap.disconnect if imap && !imap.disconnected?
+    end
+  end
+
   def create_tcp_server
     return TCPServer.new(server_addr, 0)
   end

version.h

@@ -2,7 +2,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 4
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 190
+#define RUBY_PATCHLEVEL 191
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 7