[Bug 1310781] Re: bad bignum encoding for curve25519-sha256 at libssh.org

[Launchpad Bug Tracker]

This bug was fixed in the package openssh - 1:6.6p1-2ubuntu2

---------------
openssh (1:6.6p1-2ubuntu2) trusty; urgency=medium

  * Apply upstream-recommended patch to fix bignum encoding for
    curve25519-sha256 at libssh.org, fixing occasional key exchange failures
    (LP: #1310781).
  * Force ssh-agent Upstart job to use sh syntax regardless of the user's
    shell (thanks, Steffen Stempel; LP: #1312928).
 -- Colin Watson <cjwatson at ubuntu.com>   Fri, 02 May 2014 09:42:23 +0100

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

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https://bugs.launchpad.net/bugs/1310781

Title:
  bad bignum encoding for curve25519-sha256 at libssh.org

Status in “openssh” package in Ubuntu:
  Fix Released
Status in “openssh” source package in Trusty:
  Fix Released

Bug description:
  [Impact] Occasional key exchange failure with ED25519.
  [Test Case] I don't have a clear one, but perhaps attempting lots of connections to a fixed server would do it.
  [Regression Potential] We should test with an unpatched server to make sure that it properly falls back to skipping that key exchange method.

  There's an occasional (one in 512 or so) key exchange failure in the
  curve25519-sha256 key exchange method, which affects OpenSSH 6.5 and
  6.6.  Upstream gives more details here and has recommended that
  distributors apply this patch:

    https://lists.mindrot.org/pipermail/openssh-unix-
  dev/2014-April/032494.html

  We should issue this as an update for trusty.

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