From 955d52ad6ad269670be05409dbf3d9390254d9f7 Mon Sep 17 00:00:00 2001
From: Martin Panter <vadmium+py@gmail.com>
Date: Mon, 18 Apr 2016 03:45:18 +0000
Subject: [PATCH] Issue #26657: Fix Windows directory traversal vulnerability
 with http.server

Based on patch by Philipp Hagemeister.  This fixes a regression caused by
revision f4377699fd47.

(cherry picked from commit d274b3f1f1e2d8811733fb952c9f18d7da3a376a)
---
 Lib/http/server.py           |  6 +++---
 Lib/test/test_httpservers.py | 19 +++++++++++++++++++
 Misc/NEWS                    |  4 ++++
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/Lib/http/server.py b/Lib/http/server.py
index 4688096b31c47b..2cfd3172a137e4 100644
--- a/Lib/http/server.py
+++ b/Lib/http/server.py
@@ -817,9 +817,9 @@ def translate_path(self, path):
         words = filter(None, words)
         path = os.getcwd()
         for word in words:
-            drive, word = os.path.splitdrive(word)
-            head, word = os.path.split(word)
-            if word in (os.curdir, os.pardir): continue
+            if os.path.dirname(word) or word in (os.curdir, os.pardir):
+                # Ignore components that are not a simple file/directory name
+                continue
             path = os.path.join(path, word)
         if trailing_slash:
             path += '/'
diff --git a/Lib/test/test_httpservers.py b/Lib/test/test_httpservers.py
index 6e5f2db7fdd36b..64a576570312f8 100644
--- a/Lib/test/test_httpservers.py
+++ b/Lib/test/test_httpservers.py
@@ -12,6 +12,7 @@
 import sys
 import re
 import base64
+import ntpath
 import shutil
 import urllib.parse
 import html
@@ -829,6 +830,24 @@ def test_start_with_double_slash(self):
         path = self.handler.translate_path('//filename?foo=bar')
         self.assertEqual(path, self.translated)
 
+    def test_windows_colon(self):
+        with support.swap_attr(server.os, 'path', ntpath):
+            path = self.handler.translate_path('c:c:c:foo/filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
+            path = self.handler.translate_path('\\c:../filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
+            path = self.handler.translate_path('c:\\c:..\\foo/filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
+            path = self.handler.translate_path('c:c:foo\\c:c:bar/filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
 
 class MiscTestCase(unittest.TestCase):
     def test_all(self):
diff --git a/Misc/NEWS b/Misc/NEWS
index ac54bbc8b35a5f..da19254c446448 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -19,6 +19,10 @@ Documentation
 Library
 -------
 
+- Issue #26657: Fix directory traversal vulnerability with http.server on
+  Windows.  This fixes a regression that was introduced in 3.3.4rc1 and
+  3.4.0rc1.  Based on patch by Philipp Hagemeister.
+
 - Issue #27850: Remove 3DES from ssl module's default cipher list to counter
   measure sweet32 attack (CVE-2016-2183).