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95 lines
3.5 KiB
95 lines
3.5 KiB
8 months ago
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From 6f6011442b255b6c135c294500cf4d404f594d8a Mon Sep 17 00:00:00 2001
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From: Lumir Balhar <lbalhar@redhat.com>
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Date: Tue, 12 Dec 2023 10:21:34 +0100
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Subject: [PATCH] Security fix for CVE-2023-45803
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---
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src/urllib3/_collections.py | 18 ++++++++++++++++++
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src/urllib3/connectionpool.py | 5 +++++
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src/urllib3/poolmanager.py | 7 +++++--
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3 files changed, 28 insertions(+), 2 deletions(-)
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diff --git a/src/urllib3/_collections.py b/src/urllib3/_collections.py
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index 34f2381..86fc900 100644
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--- a/src/urllib3/_collections.py
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+++ b/src/urllib3/_collections.py
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@@ -260,6 +260,24 @@ class HTTPHeaderDict(MutableMapping):
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else:
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return vals[1:]
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+ def _prepare_for_method_change(self):
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+ """
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+ Remove content-specific header fields before changing the request
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+ method to GET or HEAD according to RFC 9110, Section 15.4.
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+ """
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+ content_specific_headers = [
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+ "Content-Encoding",
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+ "Content-Language",
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+ "Content-Location",
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+ "Content-Type",
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+ "Content-Length",
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+ "Digest",
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+ "Last-Modified",
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+ ]
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+ for header in content_specific_headers:
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+ self.discard(header)
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+ return self
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+
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# Backwards compatibility for httplib
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getheaders = getlist
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getallmatchingheaders = getlist
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diff --git a/src/urllib3/connectionpool.py b/src/urllib3/connectionpool.py
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index f7a8f19..ad6303c 100644
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--- a/src/urllib3/connectionpool.py
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+++ b/src/urllib3/connectionpool.py
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@@ -32,6 +32,7 @@ from .connection import (
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HTTPConnection, HTTPSConnection, VerifiedHTTPSConnection,
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HTTPException, BaseSSLError,
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)
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+from ._collections import HTTPHeaderDict
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from .request import RequestMethods
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from .response import HTTPResponse
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@@ -679,7 +680,11 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
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redirect_location = redirect and response.get_redirect_location()
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if redirect_location:
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if response.status == 303:
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+ # Change the method according to RFC 9110, Section 15.4.4.
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method = 'GET'
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+ # And lose the body not to transfer anything sensitive.
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+ body = None
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+ headers = HTTPHeaderDict(headers)._prepare_for_method_change()
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try:
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retries = retries.increment(method, url, response=response, _pool=self)
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diff --git a/src/urllib3/poolmanager.py b/src/urllib3/poolmanager.py
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index 32bd973..37557f9 100644
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--- a/src/urllib3/poolmanager.py
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+++ b/src/urllib3/poolmanager.py
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@@ -3,7 +3,7 @@ import collections
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import functools
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import logging
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-from ._collections import RecentlyUsedContainer
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+from ._collections import HTTPHeaderDict, RecentlyUsedContainer
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from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool
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from .connectionpool import port_by_scheme
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from .exceptions import LocationValueError, MaxRetryError, ProxySchemeUnknown
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@@ -330,9 +330,12 @@ class PoolManager(RequestMethods):
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# Support relative URLs for redirecting.
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redirect_location = urljoin(url, redirect_location)
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- # RFC 7231, Section 6.4.4
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if response.status == 303:
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+ # Change the method according to RFC 9110, Section 15.4.4.
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method = 'GET'
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+ # And lose the body not to transfer anything sensitive.
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+ kw["body"] = None
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+ kw["headers"] = HTTPHeaderDict(kw["headers"])._prepare_for_method_change()
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retries = kw.get('retries')
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if not isinstance(retries, Retry):
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--
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2.43.0
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