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[3.9] bpo-43285: Add a What's New entry for 3.9.3. (GH-24888)

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Covers the ftplib security fix.
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Gregory P. Smith 2021-03-15 21:37:58 -07:00 • committed by GitHub
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@ -1529,3 +1529,12 @@ separator key, with ``&`` as the default. This change also affects
functions internally. For more details, please see their respective
documentation.
(Contributed by Adam Goldschmidt, Senthil Kumaran and Ken Jin in :issue:`42967`.)
Notable changes in Python 3.9.3
===============================
A security fix alters the :class:`ftplib.FTP` behavior to not trust the
IPv4 address sent from the remote server when setting up a passive data
channel. We reuse the ftp server IP address instead. For unusual code
requiring the old behavior, set a ``trust_server_pasv_ipv4_address``
attribute on your FTP instance to ``True``. (See :issue:`43285`)