[Bug 1499392] Re: OpenSSH Security and SHA1

[Eldin Hadzic]

Just a note:

"I  and @stribika have the same point of view
(https://stribika.github.io/2015/01/04/secure-secure-shell.html) [...]"

"I tend to agree with @aimxhaisse. Don't you think it would be
preferable to open a bug report on Ubuntu side
(https://bugs.launchpad.net/ubuntu/), see what they answer and follow
their advices?"

Have a nice Weekend,

Eldin Hadzic

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https://bugs.launchpad.net/bugs/1499392

Title:
  OpenSSH Security and SHA1

Status in openssh package in Ubuntu:
  Confirmed

Bug description:
  We should enhance Security by disabling SHA1 or, if not possible
  (older Clients) by changing the KexAlgorithms, Ciphers and MACs order.

  For e.g. by :

  1. If we add Support for older Clients we should change this:

  #### OpenSSH Security ####

  KexAlgorithms curve25519-sha256 at libssh.org,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1
  Ciphers chacha20-poly1305 at openssh.com,aes256-gcm at openssh.com,aes128-gcm at openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
  MACs hmac-sha2-512-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-ripemd160-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128 at openssh.com

  2.  If we just Support new Clients we should change this :

  [...]
  HostKey /etc/ssh/ssh_host_rsa_key
  HostKey /etc/ssh/ssh_host_ed25519_key
  [...]

  #### OpenSSH Security ####

  KexAlgorithms curve25519-sha256 at libssh.org,diffie-hellman-group-exchange-sha256
  Ciphers chacha20-poly1305 at openssh.com,aes256-gcm at openssh.com,aes128-gcm at openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
  MACs hmac-sha2-512-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-ripemd160-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128 at openssh.com

  For more Information about my report go here:

  https://github.com/scaleway/image-ubuntu/pull/35

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