58d0bc2f29
Fixes CVE-2019-9636: urlsplit does not handle NFKC normalization https://bugs.python.org/issue36216 The fix unfortunately introduced regressions, so also apply the followup fixes. https://bugs.python.org/issue36742 Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
67 lines
2.9 KiB
Diff
67 lines
2.9 KiB
Diff
From 98a4dcefbbc3bce5ab07e7c0830a183157250259 Mon Sep 17 00:00:00 2001
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From: Steve Dower <steve.dower@python.org>
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Date: Wed, 1 May 2019 15:00:27 +0000
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Subject: [PATCH] bpo-36742: Fixes handling of pre-normalization characters in
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urlsplit() (GH-13017)
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Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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---
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Lib/test/test_urlparse.py | 6 ++++++
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Lib/urlparse.py | 11 +++++++----
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.../next/Security/2019-04-29-15-34-59.bpo-36742.QCUY0i.rst | 1 +
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3 files changed, 14 insertions(+), 4 deletions(-)
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create mode 100644 Misc/NEWS.d/next/Security/2019-04-29-15-34-59.bpo-36742.QCUY0i.rst
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diff --git a/Lib/test/test_urlparse.py b/Lib/test/test_urlparse.py
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index 1830d0b286..6fd1071bf7 100644
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--- a/Lib/test/test_urlparse.py
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+++ b/Lib/test/test_urlparse.py
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@@ -641,6 +641,12 @@ class UrlParseTestCase(unittest.TestCase):
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self.assertIn(u'\u2100', denorm_chars)
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self.assertIn(u'\uFF03', denorm_chars)
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+ # bpo-36742: Verify port separators are ignored when they
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+ # existed prior to decomposition
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+ urlparse.urlsplit(u'http://\u30d5\u309a:80')
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+ with self.assertRaises(ValueError):
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+ urlparse.urlsplit(u'http://\u30d5\u309a\ufe1380')
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+
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for scheme in [u"http", u"https", u"ftp"]:
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for c in denorm_chars:
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url = u"{}://netloc{}false.netloc/path".format(scheme, c)
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diff --git a/Lib/urlparse.py b/Lib/urlparse.py
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index 54eda08651..f08e0fe584 100644
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--- a/Lib/urlparse.py
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+++ b/Lib/urlparse.py
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@@ -171,13 +171,16 @@ def _checknetloc(netloc):
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# looking for characters like \u2100 that expand to 'a/c'
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# IDNA uses NFKC equivalence, so normalize for this check
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import unicodedata
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- netloc2 = unicodedata.normalize('NFKC', netloc)
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- if netloc == netloc2:
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+ n = netloc.rpartition('@')[2] # ignore anything to the left of '@'
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+ n = n.replace(':', '') # ignore characters already included
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+ n = n.replace('#', '') # but not the surrounding text
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+ n = n.replace('?', '')
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+ netloc2 = unicodedata.normalize('NFKC', n)
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+ if n == netloc2:
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return
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- _, _, netloc = netloc.rpartition('@') # anything to the left of '@' is okay
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for c in '/?#@:':
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if c in netloc2:
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- raise ValueError("netloc '" + netloc2 + "' contains invalid " +
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+ raise ValueError("netloc '" + netloc + "' contains invalid " +
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"characters under NFKC normalization")
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def urlsplit(url, scheme='', allow_fragments=True):
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diff --git a/Misc/NEWS.d/next/Security/2019-04-29-15-34-59.bpo-36742.QCUY0i.rst b/Misc/NEWS.d/next/Security/2019-04-29-15-34-59.bpo-36742.QCUY0i.rst
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new file mode 100644
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index 0000000000..d729ed2f3c
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Security/2019-04-29-15-34-59.bpo-36742.QCUY0i.rst
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@@ -0,0 +1 @@
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+Fixes mishandling of pre-normalization characters in urlsplit().
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--
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2.11.0
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