128 lines
5.8 KiB
Diff
128 lines
5.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Lumir Balhar <lbalhar@redhat.com>
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Date: Thu, 25 May 2023 10:03:57 +0200
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Subject: [PATCH] 00399-cve-2023-24329.patch
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00399 #
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* gh-102153: Start stripping C0 control and space chars in `urlsplit` (GH-102508)
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`urllib.parse.urlsplit` has already been respecting the WHATWG spec a bit GH-25595.
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This adds more sanitizing to respect the "Remove any leading C0 control or space from input" [rule](https://url.spec.whatwg.org/GH-url-parsing:~:text=Remove%20any%20leading%20and%20trailing%20C0%20control%20or%20space%20from%20input.) in response to [CVE-2023-24329](https://nvd.nist.gov/vuln/detail/CVE-2023-24329).
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Backported to Python 2 from Python 3.12.
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Co-authored-by: Illia Volochii <illia.volochii@gmail.com>
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Co-authored-by: Gregory P. Smith [Google] <greg@krypto.org>
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Co-authored-by: Lumir Balhar <lbalhar@redhat.com>
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---
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Lib/test/test_urlparse.py | 57 +++++++++++++++++++++++++++++++++++++++
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Lib/urlparse.py | 10 +++++++
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2 files changed, 67 insertions(+)
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diff --git a/Lib/test/test_urlparse.py b/Lib/test/test_urlparse.py
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index 16eefed56f6..419e9c2bdcc 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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@@ -666,7 +666,64 @@ class UrlParseTestCase(unittest.TestCase):
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self.assertEqual(p.scheme, "https")
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self.assertEqual(p.geturl(), "https://www.python.org/javascript:alert('msg')/?query=something#fragment")
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+ def test_urlsplit_strip_url(self):
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+ noise = "".join([chr(i) for i in range(0, 0x20 + 1)])
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+ base_url = "http://User:Pass@www.python.org:080/doc/?query=yes#frag"
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+ url = noise.decode("utf-8") + base_url
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+ p = urlparse.urlsplit(url)
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+ self.assertEqual(p.scheme, "http")
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+ self.assertEqual(p.netloc, "User:Pass@www.python.org:080")
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+ self.assertEqual(p.path, "/doc/")
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+ self.assertEqual(p.query, "query=yes")
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+ self.assertEqual(p.fragment, "frag")
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+ self.assertEqual(p.username, "User")
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+ self.assertEqual(p.password, "Pass")
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+ self.assertEqual(p.hostname, "www.python.org")
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+ self.assertEqual(p.port, 80)
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+ self.assertEqual(p.geturl(), base_url)
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+
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+ url = noise + base_url.encode("utf-8")
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+ p = urlparse.urlsplit(url)
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+ self.assertEqual(p.scheme, b"http")
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+ self.assertEqual(p.netloc, b"User:Pass@www.python.org:080")
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+ self.assertEqual(p.path, b"/doc/")
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+ self.assertEqual(p.query, b"query=yes")
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+ self.assertEqual(p.fragment, b"frag")
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+ self.assertEqual(p.username, b"User")
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+ self.assertEqual(p.password, b"Pass")
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+ self.assertEqual(p.hostname, b"www.python.org")
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+ self.assertEqual(p.port, 80)
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+ self.assertEqual(p.geturl(), base_url.encode("utf-8"))
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+
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+ # Test that trailing space is preserved as some applications rely on
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+ # this within query strings.
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+ query_spaces_url = "https://www.python.org:88/doc/?query= "
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+ p = urlparse.urlsplit(noise.decode("utf-8") + query_spaces_url)
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+ self.assertEqual(p.scheme, "https")
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+ self.assertEqual(p.netloc, "www.python.org:88")
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+ self.assertEqual(p.path, "/doc/")
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+ self.assertEqual(p.query, "query= ")
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+ self.assertEqual(p.port, 88)
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+ self.assertEqual(p.geturl(), query_spaces_url)
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+
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+ p = urlparse.urlsplit("www.pypi.org ")
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+ # That "hostname" gets considered a "path" due to the
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+ # trailing space and our existing logic... YUCK...
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+ # and re-assembles via geturl aka unurlsplit into the original.
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+ # django.core.validators.URLValidator (at least through v3.2) relies on
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+ # this, for better or worse, to catch it in a ValidationError via its
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+ # regular expressions.
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+ # Here we test the basic round trip concept of such a trailing space.
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+ self.assertEqual(urlparse.urlunsplit(p), "www.pypi.org ")
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+
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+ # with scheme as cache-key
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+ url = "//www.python.org/"
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+ scheme = noise.decode("utf-8") + "https" + noise.decode("utf-8")
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+ for _ in range(2):
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+ p = urlparse.urlsplit(url, scheme=scheme)
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+ self.assertEqual(p.scheme, "https")
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+ self.assertEqual(p.geturl(), "https://www.python.org/")
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def test_attributes_bad_port(self):
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"""Check handling of non-integer ports."""
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diff --git a/Lib/urlparse.py b/Lib/urlparse.py
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index 6cc40a8d2fb..0f03a7cc4a9 100644
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--- a/Lib/urlparse.py
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+++ b/Lib/urlparse.py
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@@ -26,6 +26,10 @@ scenarios for parsing, and for backward compatibility purposes, some
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parsing quirks from older RFCs are retained. The testcases in
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test_urlparse.py provides a good indicator of parsing behavior.
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+The WHATWG URL Parser spec should also be considered. We are not compliant with
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+it either due to existing user code API behavior expectations (Hyrum's Law).
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+It serves as a useful guide when making changes.
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+
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"""
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import re
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@@ -63,6 +67,10 @@ scheme_chars = ('abcdefghijklmnopqrstuvwxyz'
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'0123456789'
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'+-.')
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+# Leading and trailing C0 control and space to be stripped per WHATWG spec.
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+# == "".join([chr(i) for i in range(0, 0x20 + 1)])
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+_WHATWG_C0_CONTROL_OR_SPACE = '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f '
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+
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# Unsafe bytes to be removed per WHATWG spec
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_UNSAFE_URL_BYTES_TO_REMOVE = ['\t', '\r', '\n']
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@@ -201,6 +209,8 @@ def urlsplit(url, scheme='', allow_fragments=True):
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(e.g. netloc is a single string) and we don't expand % escapes."""
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url = _remove_unsafe_bytes_from_url(url)
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scheme = _remove_unsafe_bytes_from_url(scheme)
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+ url = url.lstrip(_WHATWG_C0_CONTROL_OR_SPACE)
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+ scheme = scheme.strip(_WHATWG_C0_CONTROL_OR_SPACE)
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allow_fragments = bool(allow_fragments)
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key = url, scheme, allow_fragments, type(url), type(scheme)
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cached = _parse_cache.get(key, None)
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