[1.11.x] Fixed CVE-2018-14574 -- Fixed open redirect possibility in CommonMiddleware.

Andreas Hug · timgraham · commit d6eaee092709 · 2018-07-25T12:13:03.000-04:00
diff --git a/django/middleware/common.py b/django/middleware/common.py
@@ -11,6 +11,7 @@
 )
 from django.utils.deprecation import MiddlewareMixin, RemovedInDjango21Warning
 from django.utils.encoding import force_text
+from django.utils.http import escape_leading_slashes
 from django.utils.six.moves.urllib.parse import urlparse
 
 
@@ -90,6 +91,8 @@ def get_full_path_with_slash(self, request):
         POST, PUT, or PATCH.
         """
         new_path = request.get_full_path(force_append_slash=True)
+        # Prevent construction of scheme relative urls.
+        new_path = escape_leading_slashes(new_path)
         if settings.DEBUG and request.method in ('POST', 'PUT', 'PATCH'):
             raise RuntimeError(
                 "You called this URL via %(method)s, but the URL doesn't end "
diff --git a/django/urls/resolvers.py b/django/urls/resolvers.py
@@ -20,7 +20,9 @@
 from django.utils.datastructures import MultiValueDict
 from django.utils.encoding import force_str, force_text
 from django.utils.functional import cached_property
-from django.utils.http import RFC3986_SUBDELIMS, urlquote
+from django.utils.http import (
+    RFC3986_SUBDELIMS, escape_leading_slashes, urlquote,
+)
 from django.utils.regex_helper import normalize
 from django.utils.translation import get_language
 
@@ -465,9 +467,7 @@ def _reverse_with_prefix(self, lookup_view, _prefix, *args, **kwargs):
                     # safe characters from `pchar` definition of RFC 3986
                     url = urlquote(candidate_pat % candidate_subs, safe=RFC3986_SUBDELIMS + str('/~:@'))
                     # Don't allow construction of scheme relative urls.
-                    if url.startswith('//'):
-                        url = '/%%2F%s' % url[2:]
-                    return url
+                    return escape_leading_slashes(url)
         # lookup_view can be URL name or callable, but callables are not
         # friendly in error messages.
         m = getattr(lookup_view, '__module__', None)
diff --git a/django/utils/http.py b/django/utils/http.py
@@ -466,3 +466,14 @@ def limited_parse_qsl(qs, keep_blank_values=False, encoding='utf-8',
                 value = unquote(nv[1].replace(b'+', b' '))
             r.append((name, value))
     return r
+
+
+def escape_leading_slashes(url):
+    """
+    If redirecting to an absolute path (two leading slashes), a slash must be
+    escaped to prevent browsers from handling the path as schemaless and
+    redirecting to another host.
+    """
+    if url.startswith('//'):
+        url = '/%2F{}'.format(url[2:])
+    return url
diff --git a/docs/releases/1.11.15.txt b/docs/releases/1.11.15.txt
@@ -5,3 +5,16 @@ Django 1.11.15 release notes
 *August 1, 2018*
 
 Django 1.11.15 fixes a security issue in 1.11.14.
+
+CVE-2018-14574: Open redirect possibility in ``CommonMiddleware``
+=================================================================
+
+If the :class:`~django.middleware.common.CommonMiddleware` and the
+:setting:`APPEND_SLASH` setting are both enabled, and if the project has a
+URL pattern that accepts any path ending in a slash (many content management
+systems have such a pattern), then a request to a maliciously crafted URL of
+that site could lead to a redirect to another site, enabling phishing and other
+attacks.
+
+``CommonMiddleware`` now escapes leading slashes to prevent redirects to other
+domains.
diff --git a/tests/middleware/tests.py b/tests/middleware/tests.py
@@ -137,6 +137,25 @@ def test_append_slash_quoted(self):
         self.assertEqual(r.status_code, 301)
         self.assertEqual(r.url, '/needsquoting%23/')
 
+    @override_settings(APPEND_SLASH=True)
+    def test_append_slash_leading_slashes(self):
+        """
+        Paths starting with two slashes are escaped to prevent open redirects.
+        If there's a URL pattern that allows paths to start with two slashes, a
+        request with path //evil.com must not redirect to //evil.com/ (appended
+        slash) which is a schemaless absolute URL. The browser would navigate
+        to evil.com/.
+        """
+        # Use 4 slashes because of RequestFactory behavior.
+        request = self.rf.get('////evil.com/security')
+        response = HttpResponseNotFound()
+        r = CommonMiddleware().process_request(request)
+        self.assertEqual(r.status_code, 301)
+        self.assertEqual(r.url, '/%2Fevil.com/security/')
+        r = CommonMiddleware().process_response(request, response)
+        self.assertEqual(r.status_code, 301)
+        self.assertEqual(r.url, '/%2Fevil.com/security/')
+
     @override_settings(APPEND_SLASH=False, PREPEND_WWW=True)
     def test_prepend_www(self):
         request = self.rf.get('/path/')
diff --git a/tests/middleware/urls.py b/tests/middleware/urls.py
@@ -6,4 +6,6 @@
     url(r'^noslash$', views.empty_view),
     url(r'^slash/$', views.empty_view),
     url(r'^needsquoting#/$', views.empty_view),
+    # Accepts paths with two leading slashes.
+    url(r'^(.+)/security/$', views.empty_view),
 ]
diff --git a/tests/utils_tests/test_http.py b/tests/utils_tests/test_http.py
@@ -248,3 +248,13 @@ def test_parsing_rfc850(self):
     def test_parsing_asctime(self):
         parsed = http.parse_http_date('Sun Nov  6 08:49:37 1994')
         self.assertEqual(datetime.utcfromtimestamp(parsed), datetime(1994, 11, 6, 8, 49, 37))
+
+
+class EscapeLeadingSlashesTests(unittest.TestCase):
+    def test(self):
+        tests = (
+            ('//example.com', '/%2Fexample.com'),
+            ('//', '/%2F'),
+        )
+        for url, expected in tests:
+            self.assertEqual(http.escape_leading_slashes(url), expected)

Original file line number	Diff line number	Diff line change
`@@ -6,4 +6,6 @@`
`6`	`6`	`url(r'^noslash$', views.empty_view),`
`7`	`7`	`url(r'^slash/$', views.empty_view),`
`8`	`8`	`url(r'^needsquoting#/$', views.empty_view),`
	`9`	`+ # Accepts paths with two leading slashes.`
	`10`	`+ url(r'^(.+)/security/$', views.empty_view),`
`9`	`11`	`]`