Backport GHSA-v845-jxx5-vc9f (#3139)

Co-authored-by: Quentin Pradet <quentin.pradet@gmail.com>
Co-authored-by: Illia Volochii <illia.volochii@gmail.com>

CHANGES.rst

@@ -1,6 +1,12 @@
 Changes
 =======
 
+1.26.17 (2023-10-02)
+--------------------
+
+* Added the ``Cookie`` header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via ``Retry.remove_headers_on_redirect``.
+
+
 1.26.16 (2023-05-23)
 --------------------
 

src/urllib3/util/retry.py

@@ -235,7 +235,7 @@ class Retry(object):
     RETRY_AFTER_STATUS_CODES = frozenset([413, 429, 503])
 
     #: Default headers to be used for ``remove_headers_on_redirect``
-    DEFAULT_REMOVE_HEADERS_ON_REDIRECT = frozenset(["Authorization"])
+    DEFAULT_REMOVE_HEADERS_ON_REDIRECT = frozenset(["Cookie", "Authorization"])
 
     #: Maximum backoff time.
     DEFAULT_BACKOFF_MAX = 120

test/test_retry.py

@@ -293,12 +293,12 @@ def test_retry_method_not_in_whitelist(self):
     def test_retry_default_remove_headers_on_redirect(self):
         retry = Retry()
 
-        assert list(retry.remove_headers_on_redirect) == ["authorization"]
+        assert retry.remove_headers_on_redirect == {"authorization", "cookie"}
 
     def test_retry_set_remove_headers_on_redirect(self):
         retry = Retry(remove_headers_on_redirect=["X-API-Secret"])
 
-        assert list(retry.remove_headers_on_redirect) == ["x-api-secret"]
+        assert retry.remove_headers_on_redirect == {"x-api-secret"}
 
     @pytest.mark.parametrize("value", ["-1", "+1", "1.0", six.u("\xb2")])  # \xb2 = ^2
     def test_parse_retry_after_invalid(self, value):

test/test_retry_deprecated.py

@@ -295,7 +295,7 @@ def test_retry_method_not_in_whitelist(self):
     def test_retry_default_remove_headers_on_redirect(self):
         retry = Retry()
 
-        assert list(retry.remove_headers_on_redirect) == ["authorization"]
+        assert retry.remove_headers_on_redirect == {"authorization", "cookie"}
 
     def test_retry_set_remove_headers_on_redirect(self):
         retry = Retry(remove_headers_on_redirect=["X-API-Secret"])

test/with_dummyserver/test_poolmanager.py

@@ -141,20 +141,21 @@ def test_redirect_cross_host_remove_headers(self):
                 "GET",
                 "%s/redirect" % self.base_url,
                 fields={"target": "%s/headers" % self.base_url_alt},
-                headers={"Authorization": "foo"},
+                headers={"Authorization": "foo", "Cookie": "foo=bar"},
             )
 
             assert r.status == 200
 
             data = json.loads(r.data.decode("utf-8"))
 
             assert "Authorization" not in data
+            assert "Cookie" not in data
 
             r = http.request(
                 "GET",
                 "%s/redirect" % self.base_url,
                 fields={"target": "%s/headers" % self.base_url_alt},
-                headers={"authorization": "foo"},
+                headers={"authorization": "foo", "cookie": "foo=bar"},
             )
 
             assert r.status == 200
@@ -163,14 +164,16 @@ def test_redirect_cross_host_remove_headers(self):
 
             assert "authorization" not in data
             assert "Authorization" not in data
+            assert "cookie" not in data
+            assert "Cookie" not in data
 
     def test_redirect_cross_host_no_remove_headers(self):
         with PoolManager() as http:
             r = http.request(
                 "GET",
                 "%s/redirect" % self.base_url,
                 fields={"target": "%s/headers" % self.base_url_alt},
-                headers={"Authorization": "foo"},
+                headers={"Authorization": "foo", "Cookie": "foo=bar"},
                 retries=Retry(remove_headers_on_redirect=[]),
             )
 
@@ -179,14 +182,19 @@ def test_redirect_cross_host_no_remove_headers(self):
             data = json.loads(r.data.decode("utf-8"))
 
             assert data["Authorization"] == "foo"
+            assert data["Cookie"] == "foo=bar"
 
     def test_redirect_cross_host_set_removed_headers(self):
         with PoolManager() as http:
             r = http.request(
                 "GET",
                 "%s/redirect" % self.base_url,
                 fields={"target": "%s/headers" % self.base_url_alt},
-                headers={"X-API-Secret": "foo", "Authorization": "bar"},
+                headers={
+                    "X-API-Secret": "foo",
+                    "Authorization": "bar",
+                    "Cookie": "foo=bar",
+                },
                 retries=Retry(remove_headers_on_redirect=["X-API-Secret"]),
             )
 
@@ -196,12 +204,17 @@ def test_redirect_cross_host_set_removed_headers(self):
 
             assert "X-API-Secret" not in data
             assert data["Authorization"] == "bar"
+            assert data["Cookie"] == "foo=bar"
 
             r = http.request(
                 "GET",
                 "%s/redirect" % self.base_url,
                 fields={"target": "%s/headers" % self.base_url_alt},
-                headers={"x-api-secret": "foo", "authorization": "bar"},
+                headers={
+                    "x-api-secret": "foo",
+                    "authorization": "bar",
+                    "cookie": "foo=bar",
+                },
                 retries=Retry(remove_headers_on_redirect=["X-API-Secret"]),
             )
 
@@ -212,6 +225,7 @@ def test_redirect_cross_host_set_removed_headers(self):
             assert "x-api-secret" not in data
             assert "X-API-Secret" not in data
             assert data["Authorization"] == "bar"
+            assert data["Cookie"] == "foo=bar"
 
     def test_redirect_without_preload_releases_connection(self):
         with PoolManager(block=True, maxsize=2) as http: