[openssh-unix-announce] Announce: OpenSSH 8.1 released

---------- Forwarded message ---------
From: Damien Miller
Date: Oct 9, 2019 11:44AM

Security
========

 * ssh(1), sshd(8), ssh-add(1), ssh-keygen(1): an exploitable integer
   overflow bug was found in the private key parsing code for the XMSS
   key type. This key type is still experimental and support for it is
   not compiled by default. No user-facing autoconf option exists in
   portable OpenSSH to enable it. This bug was found by Adam Zabrocki
   and reported via SecuriTeam's SSD program.

 * ssh(1), sshd(8), ssh-agent(1): add protection for private keys at
   rest in RAM against speculation and memory side-channel attacks like
   Spectre, Meltdown and Rambleed. This release encrypts private keys
   when they are not in use with a symmetric key that is derived from a
   relatively large "prekey" consisting of random data (currently 16KB).

Potentially-incompatible changes
================================

This release includes a number of changes that may affect existing
configurations:

 * ssh-keygen(1): when acting as a CA and signing certificates with
   an RSA key, default to using the rsa-sha2-512 signature algorithm.
   Certificates signed by RSA keys will therefore be incompatible
   with OpenSSH versions prior to 7.2 unless the default is
   overridden (using "ssh-keygen -t ssh-rsa -s ...").

Changes since OpenSSH 8.0
=========================

This release is focused on bug-fixing.