python-urllib3/SOURCES/CVE-2023-45803.patch

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