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From d5e3238b87fc557600618f18179e821a4a1c7577 Mon Sep 17 00:00:00 2001
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From: Lumir Balhar <lbalhar@redhat.com>
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Date: Tue, 29 Jun 2021 16:03:37 +0200
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Subject: [PATCH] CVE-2021-33503
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---
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src/urllib3/util/url.py | 8 +++++---
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test/test_util.py | 10 ++++++++++
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2 files changed, 15 insertions(+), 3 deletions(-)
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diff --git a/src/urllib3/util/url.py b/src/urllib3/util/url.py
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index 8ef5a23..7fb2650 100644
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--- a/src/urllib3/util/url.py
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+++ b/src/urllib3/util/url.py
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@@ -63,12 +63,12 @@ IPV6_ADDRZ_RE = re.compile("^" + IPV6_ADDRZ_PAT + "$")
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BRACELESS_IPV6_ADDRZ_RE = re.compile("^" + IPV6_ADDRZ_PAT[2:-2] + "$")
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ZONE_ID_RE = re.compile("(" + ZONE_ID_PAT + r")\]$")
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-SUBAUTHORITY_PAT = (u"^(?:(.*)@)?(%s|%s|%s)(?::([0-9]{0,5}))?$") % (
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+_HOST_PORT_PAT = ("^(%s|%s|%s)(?::([0-9]{0,5}))?$") % (
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REG_NAME_PAT,
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IPV4_PAT,
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IPV6_ADDRZ_PAT,
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)
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-SUBAUTHORITY_RE = re.compile(SUBAUTHORITY_PAT, re.UNICODE | re.DOTALL)
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+_HOST_PORT_RE = re.compile(_HOST_PORT_PAT, re.UNICODE | re.DOTALL)
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UNRESERVED_CHARS = set(
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._-~"
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@@ -365,7 +365,9 @@ def parse_url(url):
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scheme = scheme.lower()
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if authority:
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- auth, host, port = SUBAUTHORITY_RE.match(authority).groups()
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+ auth, _, host_port = authority.rpartition("@")
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+ auth = auth or None
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+ host, port = _HOST_PORT_RE.match(host_port).groups()
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if auth and normalize_uri:
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auth = _encode_invalid_chars(auth, USERINFO_CHARS)
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if port == "":
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diff --git a/test/test_util.py b/test/test_util.py
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index 42c3882..04c90b0 100644
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--- a/test/test_util.py
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+++ b/test/test_util.py
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@@ -425,6 +425,16 @@ class TestUtil(object):
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query="%0D%0ASET%20test%20failure12%0D%0A:8080/test/?test=a",
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),
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),
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+ # Tons of '@' causing backtracking
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+ ("https://" + ("@" * 10000) + "[", False),
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+ (
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+ "https://user:" + ("@" * 10000) + "example.com",
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+ Url(
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+ scheme="https",
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+ auth="user:" + ("%40" * 9999),
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+ host="example.com",
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+ ),
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+ ),
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]
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@pytest.mark.parametrize("url, expected_url", url_vulnerabilities)
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--
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2.31.1
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