Index: Python-2.7.17/Lib/httplib.py

===================================================================

--- Python-2.7.17.orig/Lib/httplib.py

+++ Python-2.7.17/Lib/httplib.py

@@ -261,6 +261,10 @@ _contains_disallowed_url_pchar_re = re.c

 # servers will otherwise respond with a 411

 _METHODS_EXPECTING_BODY = {'PATCH', 'POST', 'PUT'}

+# These characters are not allowed within HTTP method names

+# to prevent http header injection.

+_contains_disallowed_method_pchar_re = re.compile('[\x00-\x1f]')

+

 class HTTPMessage(mimetools.Message):

@@ -935,6 +939,8 @@ class HTTPConnection:

         else:

             raise CannotSendRequest()

+        self._validate_method(method)

+

         # Save the method for use later in the response phase

         self._method = method

@@ -1042,6 +1048,15 @@ class HTTPConnection:

             ).format(matched=match.group(), host=host)

             raise InvalidURL(msg)

+    def _validate_method(self, method):

+        """Validate a method name for putrequest."""

+        # prevent http header injection

+        match = _contains_disallowed_method_pchar_re.search(method)

+        if match:

+            raise ValueError(

+                "method can't contain control characters. %r (found at "

+                "least %r)" % (method, match.group()))

+

     def putheader(self, header, *values):

         """Send a request header line to the server.

Index: Python-2.7.17/Lib/test/test_httplib.py

===================================================================

--- Python-2.7.17.orig/Lib/test/test_httplib.py

+++ Python-2.7.17/Lib/test/test_httplib.py

@@ -1007,11 +1007,31 @@ class TunnelTests(TestCase):

         self.assertTrue('Host: destination.com' in conn.sock.data)

+class HttpMethodTests(TestCase):

+    def test_invalid_method_names(self):

+        methods = (

+            'GET\r',

+            'POST\n',

+            'PUT\n\r',

+            'POST\nValue',

+            'POST\nHOST:abc',

+            'GET\nrHost:abc\n',

+            'POST\rRemainder:\r',

+            'GET\rHOST:\n',

+            '\nPUT'

+        )

+

+        for method in methods:

+            conn = httplib.HTTPConnection('example.com')

+            conn.sock = FakeSocket(None)

+            self.assertRaises(ValueError, conn.request, method=method, url="/")

+

+

 @test_support.reap_threads

 def test_main(verbose=None):

     test_support.run_unittest(HeaderTests, OfflineTest, BasicTest, TimeoutTest,

-                              HTTPTest, HTTPSTest, SourceAddressTest,

-                              TunnelTests)

+                              HTTPTest, HTTPSTest, HttpMethodTests,

+                              SourceAddressTest, TunnelTests)

 if __name__ == '__main__':

     test_main()

​