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Last-minute updates for release notes.
Security: CVE-2021-23214, CVE-2021-23222
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doc/src/sgml/release-9.6.sgml

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<para>
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However, note that installations using physical replication should
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update standby servers before the primary server, as explained in
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the first changelog entry below.
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the third changelog entry below.
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</para>
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<para>
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<listitem>
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<!--
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Author: Tom Lane <tgl@sss.pgh.pa.us>
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Branch: master [28e241255] 2021-11-08 11:01:43 -0500
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Branch: REL_14_STABLE [9d5a76b8d] 2021-11-08 11:01:43 -0500
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Branch: REL_13_STABLE [e92ed93e8] 2021-11-08 11:01:43 -0500
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Branch: REL_12_STABLE [d1bd26740] 2021-11-08 11:01:43 -0500
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Branch: REL_11_STABLE [9394fb828] 2021-11-08 11:01:43 -0500
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Branch: REL_10_STABLE [9ae0f1112] 2021-11-08 11:01:43 -0500
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Branch: REL9_6_STABLE [046c2c846] 2021-11-08 11:01:43 -0500
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-->
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<para>
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Make the server reject extraneous data after an SSL or GSS
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encryption handshake (Tom Lane)
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</para>
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<para>
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A man-in-the-middle with the ability to inject data into the TCP
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connection could stuff some cleartext data into the start of a
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supposedly encryption-protected database session.
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This could be abused to send faked SQL commands to the server,
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although that would only work if the server did not demand any
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authentication data. (However, a server relying on SSL certificate
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authentication might well not do so.)
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</para>
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<para>
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The <productname>PostgreSQL</productname> Project thanks
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Jacob Champion for reporting this problem.
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(CVE-2021-23214)
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Tom Lane <tgl@sss.pgh.pa.us>
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Branch: master [160c02588] 2021-11-08 11:14:56 -0500
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Branch: REL_14_STABLE [30547d791] 2021-11-08 11:14:56 -0500
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Branch: REL_13_STABLE [844b31692] 2021-11-08 11:14:56 -0500
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Branch: REL_12_STABLE [36bb95ef2] 2021-11-08 11:14:56 -0500
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Branch: REL_11_STABLE [a021a1d2a] 2021-11-08 11:14:56 -0500
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Branch: REL_10_STABLE [e65d9c8cd] 2021-11-08 11:14:56 -0500
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Branch: REL9_6_STABLE [d83cdfdca] 2021-11-08 11:14:57 -0500
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-->
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<para>
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Make <application>libpq</application> reject extraneous data after
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an SSL or GSS encryption handshake (Tom Lane)
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</para>
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<para>
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A man-in-the-middle with the ability to inject data into the TCP
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connection could stuff some cleartext data into the start of a
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supposedly encryption-protected database session.
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This could probably be abused to inject faked responses to the
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client's first few queries, although other details of libpq's
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behavior make that harder than it sounds. A different line of
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attack is to exfiltrate the client's password, or other sensitive
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data that might be sent early in the session. That has been shown
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to be possible with a server vulnerable to CVE-2021-23214.
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</para>
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<para>
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The <productname>PostgreSQL</productname> Project thanks
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Jacob Champion for reporting this problem.
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(CVE-2021-23222)
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
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Branch: master [ff9f111bc] 2021-09-29 11:21:51 -0300
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Branch: REL_14_STABLE [64a8687a6] 2021-09-29 11:41:01 -0300

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