From 4fe82a8eef7aed60de05bfca0f2c322730ea921e Mon Sep 17 00:00:00 2001 From: Victor Stinner Date: Sun, 14 Jul 2019 09:04:15 +0200 Subject: bpo-35907, CVE-2019-9948: urllib rejects local_file:// scheme (GH-13474) (GH-13505) (#13510) CVE-2019-9948: Avoid file reading by disallowing local-file:// and local_file:// URL schemes in URLopener().open() and URLopener().retrieve() of urllib.request. Co-Authored-By: SH --- Lib/test/test_urllib.py | 18 ++++++++++++++++++ Lib/urllib/request.py | 2 +- .../Security/2019-05-21-23-20-18.bpo-35907.NC_zNK.rst | 3 +++ 3 files changed, 22 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 1a28c9a..3afb131 100644 --- a/Lib/test/test_urllib.py +++ b/Lib/test/test_urllib.py @@ -16,6 +16,7 @@ except ImportError: ssl = None import sys import tempfile +import warnings from nturl2path import url2pathname, pathname2url from base64 import b64encode @@ -1409,6 +1410,23 @@ class URLopener_Tests(unittest.TestCase): "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 e98be0c..3184dda 100644 --- a/Lib/urllib/request.py +++ b/Lib/urllib/request.py @@ -1683,7 +1683,7 @@ class URLopener: 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: diff --git a/Misc/NEWS.d/next/Security/2019-05-21-23-20-18.bpo-35907.NC_zNK.rst b/Misc/NEWS.d/next/Security/2019-05-21-23-20-18.bpo-35907.NC_zNK.rst new file mode 100644 index 0000000..37b567a --- /dev/null +++ b/Misc/NEWS.d/next/Security/2019-05-21-23-20-18.bpo-35907.NC_zNK.rst @@ -0,0 +1,3 @@ +CVE-2019-9948: Avoid file reading by disallowing ``local-file://`` and +``local_file://`` URL schemes in ``URLopener().open()`` and +``URLopener().retrieve()`` of :mod:`urllib.request`. -- cgit v0.12