From 8f99cc799e4393bf1112b9395b2342f81b3f45ef Mon Sep 17 00:00:00 2001
From: push0ebp <push0ebp@shl-MacBook-Pro.local>
Date: Thu, 14 Feb 2019 02:05:46 +0900
Subject: [PATCH] bpo-35907: Avoid file reading as disallowing the unnecessary
 URL scheme in urllib

Upstream-Status: Submitted https://github.com/python/cpython/pull/11842

CVE: CVE-2019-9948

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
 Lib/test/test_urllib.py | 12 ++++++++++++
 Lib/urllib.py           |  5 ++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index 1ce9201c0693..e5f210e62a18 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -1023,6 +1023,18 @@ def open_spam(self, url):
             "spam://c:|windows%/:=&?~#+!$,;'@()*[]|/path/"),
             "//c:|windows%/:=&?~#+!$,;'@()*[]|/path/")
 
+    def test_local_file_open(self):
+        class DummyURLopener(urllib.URLopener):
+            def open_local_file(self, url):
+                return url
+        self.assertEqual(DummyURLopener().open(
+            'local-file://example'), '//example')
+        self.assertEqual(DummyURLopener().open(
+            'local_file://example'), '//example')
+        self.assertRaises(IOError, urllib.urlopen,
+            'local-file://example')
+        self.assertRaises(IOError, urllib.urlopen,
+            'local_file://example')
 
 # Just commented them out.
 # Can't really tell why keep failing in windows and sparc.
diff --git a/Lib/urllib.py b/Lib/urllib.py
index d85504a5cb7e..a24e9a5c68fb 100644
--- a/Lib/urllib.py
+++ b/Lib/urllib.py
@@ -203,7 +203,10 @@ def open(self, fullurl, data=None):
         name = 'open_' + urltype
         self.type = urltype
         name = name.replace('-', '_')
-        if not hasattr(self, name):
+        
+        # bpo-35907: # disallow the file reading with the type not allowed
+        if not hasattr(self, name) or \
+            (self == _urlopener and name == 'open_local_file'):
             if proxy:
                 return self.open_unknown_proxy(proxy, fullurl, data)
             else: