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From 34bab215596671d0dec2066ae7d7450cd73f638b Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@redhat.com>
Date: Wed, 22 May 2019 23:28:28 +0200
Subject: [PATCH] bpo-35907, CVE-2019-9948: urllib rejects local_file:// scheme
(GH-13474) (GH-13505)
CVE-2019-9948: Avoid file reading as disallowing the unnecessary URL
scheme in URLopener().open() and URLopener().retrieve()
of urllib.request.
Co-Authored-By: SH <push0ebp@gmail.com>
(cherry picked from commit 0c2b6a3943aa7b022e8eb4bfd9bffcddebf9a587)
---
Lib/test/test_urllib.py | 18 ++++++++++++++++++
Lib/urllib/request.py | 2 +-
3 files changed, 21 insertions(+), 1 deletion(-)
create mode 100644 Misc/NEWS.d/next/Security/2019-05-21-23-20-18.bpo-35907.NC_zNK.rst
diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index 7214492eca9d..7ec365b928a5 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -16,6 +16,7 @@
ssl = None
import sys
import tempfile
+import warnings
from nturl2path import url2pathname, pathname2url
from base64 import b64encode
@@ -1463,6 +1464,23 @@ def open_spam(self, url):
"spam://c:|windows%/:=&?~#+!$,;'@()*[]|/path/"),
"//c:|windows%/:=&?~#+!$,;'@()*[]|/path/")
+ def test_local_file_open(self):
+ # bpo-35907, CVE-2019-9948: urllib must reject local_file:// scheme
+ class DummyURLopener(urllib.request.URLopener):
+ def open_local_file(self, url):
+ return url
+
+ with warnings.catch_warnings(record=True):
+ warnings.simplefilter("ignore", DeprecationWarning)
+
+ for url in ('local_file://example', 'local-file://example'):
+ self.assertRaises(OSError, urllib.request.urlopen, url)
+ self.assertRaises(OSError, urllib.request.URLopener().open, url)
+ self.assertRaises(OSError, urllib.request.URLopener().retrieve, url)
+ self.assertRaises(OSError, DummyURLopener().open, url)
+ self.assertRaises(OSError, DummyURLopener().retrieve, url)
+
+
# Just commented them out.
# Can't really tell why keep failing in windows and sparc.
# Everywhere else they work ok, but on those machines, sometimes
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index d38f725d8e9f..37b254862887 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -1746,7 +1746,7 @@ def open(self, fullurl, data=None):
name = 'open_' + urltype
self.type = urltype
name = name.replace('-', '_')
- if not hasattr(self, name):
+ if not hasattr(self, name) or name == 'open_local_file':
if proxy:
return self.open_unknown_proxy(proxy, fullurl, data)
else:
|
