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[Launchpad Bug Tracker <1526357@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package openssh - 1:7.1p1-4

---------------
openssh (1:7.1p1-4) unstable; urgency=medium

  * Backport upstream patch to unbreak connections with peers that set
    first_kex_follows (LP: #1526357).

 -- Colin Watson <cjwatson@xxxxxxxxxx>  Tue, 15 Dec 2015 15:40:18 +0000

** Changed in: openssh (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1526357

Title:
  Fix broken handling of first_kex_follows clients

Status in openssh package in Ubuntu:
  Fix Released

Bug description:
  OpenSSH versions between 6.8 and 7.1 inclusive have a regression that
  breaks connections from clients that use SSH first_kex_follows
  feature. This affects connections from the Dropbear SSH client
  (dbclient), they fail with "bad hostkey signature" or similar. It may
  affect ssh.com clients too.

  This has been fixed in upstream in the attached patch, it would be
  worthwhile including in Xenial if it's going to ship with the current
  OpenSSH 7.1. Upstream change 1.115 http://cvsweb.openbsd.org/cgi-
  bin/cvsweb/src/usr.bin/ssh/kex.c

  https://bugzilla.mindrot.org/show_bug.cgi?id=2515#c6 Comment 6 is the
  upstream bug report (ignore the rest of the bug about new diffie-
  hellman algorithms)

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