diff --git a/backport-CVE-2023-40217.patch b/backport-CVE-2023-40217.patch new file mode 100644 index 0000000000000000000000000000000000000000..f0101c4ca9b64660ad874d479391f8c23c22ec26 --- /dev/null +++ b/backport-CVE-2023-40217.patch @@ -0,0 +1,340 @@ +From 264b1dacc67346efa0933d1e63f622676e0ed96b Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?=C5=81ukasz=20Langa?= +Date: Tue, 22 Aug 2023 19:57:10 +0200 +Subject: [PATCH] [3.9] gh-108310: Fix CVE-2023-40217: Check for & avoid the + ssl pre-close flaw (#108320) +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +gh-108310: Fix CVE-2023-40217: Check for & avoid the ssl pre-close flaw + +Instances of `ssl.SSLSocket` were vulnerable to a bypass of the TLS handshake +and included protections (like certificate verification) and treating sent +unencrypted data as if it were post-handshake TLS encrypted data. + +The vulnerability is caused when a socket is connected, data is sent by the +malicious peer and stored in a buffer, and then the malicious peer closes the +socket within a small timing window before the other peers’ TLS handshake can +begin. After this sequence of events the closed socket will not immediately +attempt a TLS handshake due to not being connected but will also allow the +buffered data to be read as if a successful TLS handshake had occurred. + +Co-authored-by: Gregory P. Smith [Google LLC] + +Reference:https://github.com/python/cpython/commit/264b1dacc67346efa0933d1e63f622676e0ed96b +Conflict:Lib/test/test_ssl.py + +--- + Lib/ssl.py | 31 ++- + Lib/test/test_ssl.py | 215 ++++++++++++++++++ + ...-08-22-17-39-12.gh-issue-108310.fVM3sg.rst | 7 + + 3 files changed, 252 insertions(+), 1 deletion(-) + create mode 100644 Misc/NEWS.d/next/Security/2023-08-22-17-39-12.gh-issue-108310.fVM3sg.rst + +diff --git a/Lib/ssl.py b/Lib/ssl.py +index 30f4e59..2565e7f 100644 +--- a/Lib/ssl.py ++++ b/Lib/ssl.py +@@ -1002,7 +1002,7 @@ class SSLSocket(socket): + ) + self = cls.__new__(cls, **kwargs) + super(SSLSocket, self).__init__(**kwargs) +- self.settimeout(sock.gettimeout()) ++ sock_timeout = sock.gettimeout() + sock.detach() + + self._context = context +@@ -1021,9 +1021,38 @@ class SSLSocket(socket): + if e.errno != errno.ENOTCONN: + raise + connected = False ++ blocking = self.getblocking() ++ self.setblocking(False) ++ try: ++ # We are not connected so this is not supposed to block, but ++ # testing revealed otherwise on macOS and Windows so we do ++ # the non-blocking dance regardless. Our raise when any data ++ # is found means consuming the data is harmless. ++ notconn_pre_handshake_data = self.recv(1) ++ except OSError as e: ++ # EINVAL occurs for recv(1) on non-connected on unix sockets. ++ if e.errno not in (errno.ENOTCONN, errno.EINVAL): ++ raise ++ notconn_pre_handshake_data = b'' ++ self.setblocking(blocking) ++ if notconn_pre_handshake_data: ++ # This prevents pending data sent to the socket before it was ++ # closed from escaping to the caller who could otherwise ++ # presume it came through a successful TLS connection. ++ reason = "Closed before TLS handshake with data in recv buffer." ++ notconn_pre_handshake_data_error = SSLError(e.errno, reason) ++ # Add the SSLError attributes that _ssl.c always adds. ++ notconn_pre_handshake_data_error.reason = reason ++ notconn_pre_handshake_data_error.library = None ++ try: ++ self.close() ++ except OSError: ++ pass ++ raise notconn_pre_handshake_data_error + else: + connected = True + ++ self.settimeout(sock_timeout) # Must come after setblocking() calls. + self._connected = connected + if connected: + # create the SSL object +diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py +index 42ebcc0..2c71c27 100644 +--- a/Lib/test/test_ssl.py ++++ b/Lib/test/test_ssl.py +@@ -5,11 +5,14 @@ import unittest + import unittest.mock + from test import support + from test.support import socket_helper ++import re + import socket + import select ++import struct + import time + import datetime + import gc ++import http.client + import os + import errno + import pprint +@@ -4813,6 +4816,218 @@ class TestSSLDebug(unittest.TestCase): + s.connect((HOST, server.port)) + + ++def set_socket_so_linger_on_with_zero_timeout(sock): ++ sock.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, struct.pack('ii', 1, 0)) ++ ++ ++class TestPreHandshakeClose(unittest.TestCase): ++ """Verify behavior of close sockets with received data before to the handshake. ++ """ ++ ++ class SingleConnectionTestServerThread(threading.Thread): ++ ++ def __init__(self, *, name, call_after_accept): ++ self.call_after_accept = call_after_accept ++ self.received_data = b'' # set by .run() ++ self.wrap_error = None # set by .run() ++ self.listener = None # set by .start() ++ self.port = None # set by .start() ++ super().__init__(name=name) ++ ++ def __enter__(self): ++ self.start() ++ return self ++ ++ def __exit__(self, *args): ++ try: ++ if self.listener: ++ self.listener.close() ++ except OSError: ++ pass ++ self.join() ++ self.wrap_error = None # avoid dangling references ++ ++ def start(self): ++ self.ssl_ctx = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH) ++ self.ssl_ctx.verify_mode = ssl.CERT_REQUIRED ++ self.ssl_ctx.load_verify_locations(cafile=ONLYCERT) ++ self.ssl_ctx.load_cert_chain(certfile=ONLYCERT, keyfile=ONLYKEY) ++ self.listener = socket.socket() ++ self.port = socket_helper.bind_port(self.listener) ++ self.listener.settimeout(2.0) ++ self.listener.listen(1) ++ super().start() ++ ++ def run(self): ++ conn, address = self.listener.accept() ++ self.listener.close() ++ with conn: ++ if self.call_after_accept(conn): ++ return ++ try: ++ tls_socket = self.ssl_ctx.wrap_socket(conn, server_side=True) ++ except OSError as err: # ssl.SSLError inherits from OSError ++ self.wrap_error = err ++ else: ++ try: ++ self.received_data = tls_socket.recv(400) ++ except OSError: ++ pass # closed, protocol error, etc. ++ ++ def non_linux_skip_if_other_okay_error(self, err): ++ if sys.platform == "linux": ++ return # Expect the full test setup to always work on Linux. ++ if (isinstance(err, ConnectionResetError) or ++ (isinstance(err, OSError) and err.errno == errno.EINVAL) or ++ re.search('wrong.version.number', getattr(err, "reason", ""), re.I)): ++ # On Windows the TCP RST leads to a ConnectionResetError ++ # (ECONNRESET) which Linux doesn't appear to surface to userspace. ++ # If wrap_socket() winds up on the "if connected:" path and doing ++ # the actual wrapping... we get an SSLError from OpenSSL. Typically ++ # WRONG_VERSION_NUMBER. While appropriate, neither is the scenario ++ # we're specifically trying to test. The way this test is written ++ # is known to work on Linux. We'll skip it anywhere else that it ++ # does not present as doing so. ++ self.skipTest(f"Could not recreate conditions on {sys.platform}:" ++ f" {err=}") ++ # If maintaining this conditional winds up being a problem. ++ # just turn this into an unconditional skip anything but Linux. ++ # The important thing is that our CI has the logic covered. ++ ++ def test_preauth_data_to_tls_server(self): ++ server_accept_called = threading.Event() ++ ready_for_server_wrap_socket = threading.Event() ++ ++ def call_after_accept(unused): ++ server_accept_called.set() ++ if not ready_for_server_wrap_socket.wait(2.0): ++ raise RuntimeError("wrap_socket event never set, test may fail.") ++ return False # Tell the server thread to continue. ++ ++ server = self.SingleConnectionTestServerThread( ++ call_after_accept=call_after_accept, ++ name="preauth_data_to_tls_server") ++ server.__enter__() # starts it ++ self.addCleanup(server.__exit__) # ... & unittest.TestCase stops it. ++ ++ with socket.socket() as client: ++ client.connect(server.listener.getsockname()) ++ # This forces an immediate connection close via RST on .close(). ++ set_socket_so_linger_on_with_zero_timeout(client) ++ client.setblocking(False) ++ ++ server_accept_called.wait() ++ client.send(b"DELETE /data HTTP/1.0\r\n\r\n") ++ client.close() # RST ++ ++ ready_for_server_wrap_socket.set() ++ server.join() ++ wrap_error = server.wrap_error ++ self.assertEqual(b"", server.received_data) ++ self.assertIsInstance(wrap_error, OSError) # All platforms. ++ self.non_linux_skip_if_other_okay_error(wrap_error) ++ self.assertIsInstance(wrap_error, ssl.SSLError) ++ self.assertIn("before TLS handshake with data", wrap_error.args[1]) ++ self.assertIn("before TLS handshake with data", wrap_error.reason) ++ self.assertNotEqual(0, wrap_error.args[0]) ++ self.assertIsNone(wrap_error.library, msg="attr must exist") ++ ++ def test_preauth_data_to_tls_client(self): ++ client_can_continue_with_wrap_socket = threading.Event() ++ ++ def call_after_accept(conn_to_client): ++ # This forces an immediate connection close via RST on .close(). ++ set_socket_so_linger_on_with_zero_timeout(conn_to_client) ++ conn_to_client.send( ++ b"HTTP/1.0 307 Temporary Redirect\r\n" ++ b"Location: https://example.com/someone-elses-server\r\n" ++ b"\r\n") ++ conn_to_client.close() # RST ++ client_can_continue_with_wrap_socket.set() ++ return True # Tell the server to stop. ++ ++ server = self.SingleConnectionTestServerThread( ++ call_after_accept=call_after_accept, ++ name="preauth_data_to_tls_client") ++ server.__enter__() # starts it ++ self.addCleanup(server.__exit__) # ... & unittest.TestCase stops it. ++ ++ # Redundant; call_after_accept sets SO_LINGER on the accepted conn. ++ set_socket_so_linger_on_with_zero_timeout(server.listener) ++ ++ with socket.socket() as client: ++ client.connect(server.listener.getsockname()) ++ if not client_can_continue_with_wrap_socket.wait(2.0): ++ self.fail("test server took too long.") ++ ssl_ctx = ssl.create_default_context() ++ try: ++ tls_client = ssl_ctx.wrap_socket( ++ client, server_hostname="localhost") ++ except OSError as err: # SSLError inherits from OSError ++ wrap_error = err ++ received_data = b"" ++ else: ++ wrap_error = None ++ received_data = tls_client.recv(400) ++ tls_client.close() ++ ++ server.join() ++ self.assertEqual(b"", received_data) ++ self.assertIsInstance(wrap_error, OSError) # All platforms. ++ self.non_linux_skip_if_other_okay_error(wrap_error) ++ self.assertIsInstance(wrap_error, ssl.SSLError) ++ self.assertIn("before TLS handshake with data", wrap_error.args[1]) ++ self.assertIn("before TLS handshake with data", wrap_error.reason) ++ self.assertNotEqual(0, wrap_error.args[0]) ++ self.assertIsNone(wrap_error.library, msg="attr must exist") ++ ++ def test_https_client_non_tls_response_ignored(self): ++ ++ server_responding = threading.Event() ++ ++ class SynchronizedHTTPSConnection(http.client.HTTPSConnection): ++ def connect(self): ++ http.client.HTTPConnection.connect(self) ++ # Wait for our fault injection server to have done its thing. ++ if not server_responding.wait(1.0) and support.verbose: ++ sys.stdout.write("server_responding event never set.") ++ self.sock = self._context.wrap_socket( ++ self.sock, server_hostname=self.host) ++ ++ def call_after_accept(conn_to_client): ++ # This forces an immediate connection close via RST on .close(). ++ set_socket_so_linger_on_with_zero_timeout(conn_to_client) ++ conn_to_client.send( ++ b"HTTP/1.0 402 Payment Required\r\n" ++ b"\r\n") ++ conn_to_client.close() # RST ++ server_responding.set() ++ return True # Tell the server to stop. ++ ++ server = self.SingleConnectionTestServerThread( ++ call_after_accept=call_after_accept, ++ name="non_tls_http_RST_responder") ++ server.__enter__() # starts it ++ self.addCleanup(server.__exit__) # ... & unittest.TestCase stops it. ++ # Redundant; call_after_accept sets SO_LINGER on the accepted conn. ++ set_socket_so_linger_on_with_zero_timeout(server.listener) ++ ++ connection = SynchronizedHTTPSConnection( ++ f"localhost", ++ port=server.port, ++ context=ssl.create_default_context(), ++ timeout=2.0, ++ ) ++ # There are lots of reasons this raises as desired, long before this ++ # test was added. Sending the request requires a successful TLS wrapped ++ # socket; that fails if the connection is broken. It may seem pointless ++ # to test this. It serves as an illustration of something that we never ++ # want to happen... properly not happening. ++ with self.assertRaises(OSError) as err_ctx: ++ connection.request("HEAD", "/test", headers={"Host": "localhost"}) ++ response = connection.getresponse() ++ ++ + def setUpModule(): + if support.verbose: + plats = { +diff --git a/Misc/NEWS.d/next/Security/2023-08-22-17-39-12.gh-issue-108310.fVM3sg.rst b/Misc/NEWS.d/next/Security/2023-08-22-17-39-12.gh-issue-108310.fVM3sg.rst +new file mode 100644 +index 0000000..403c77a +--- /dev/null ++++ b/Misc/NEWS.d/next/Security/2023-08-22-17-39-12.gh-issue-108310.fVM3sg.rst +@@ -0,0 +1,7 @@ ++Fixed an issue where instances of :class:`ssl.SSLSocket` were vulnerable to ++a bypass of the TLS handshake and included protections (like certificate ++verification) and treating sent unencrypted data as if it were ++post-handshake TLS encrypted data. Security issue reported as ++`CVE-2023-40217 ++`_ by ++Aapo Oksman. Patch by Gregory P. Smith. +-- +2.33.0 + diff --git a/python3.spec b/python3.spec index cfa8f7ebb2b06e0337032ebc5cffc09c58079633..961958f1a49bda1f06ef1510fe972b7e93d56280 100644 --- a/python3.spec +++ b/python3.spec @@ -3,7 +3,7 @@ Summary: Interpreter of the Python3 programming language URL: https://www.python.org/ Version: 3.9.9 -Release: 25 +Release: 26 License: Python-2.0 %global branchversion 3.9 @@ -105,6 +105,7 @@ Patch6011: backport-CVE-2022-45061.patch Patch6012: backport-CVE-2022-37454.patch Patch6013: backport-Make-urllib.parse.urlparse-enforce-that-a-scheme-mus.patch Patch6014: backport-CVE-2007-4559.patch +Patch6015: backport-CVE-2023-40217.patch Patch9000: add-the-sm3-method-for-obtaining-the-salt-value.patch Patch9001: python3-Add-sw64-architecture.patch @@ -209,6 +210,7 @@ rm -r Modules/expat %patch6012 -p1 %patch6013 -p1 %patch6014 -p1 +%patch6015 -p1 %patch9000 -p1 %patch9001 -p1 @@ -838,6 +840,12 @@ export BEP_GTDLIST="$BEP_GTDLIST_TMP" %{_mandir}/*/* %changelog +* Tue Sep 19 zhuofeng - 3.9.9-26 +- Type:CVE +- CVE:CVE-2023-40217 +- SUG:NA +- DESC:fix CVE-2023-40217 + * Mon Aug 07 2023 zhaoyu - 3.9.9-25 - Type:CVE - CVE:CVE-2007-4559