[Bug 1287222] Re: openssh-client 6.5 regression bug with certain servers

[Julian Alarcon]

** Bug watch added: Debian Bug tracker #740307
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=740307

** Also affects: openssh (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=740307
   Importance: Unknown
       Status: Unknown

** Also affects: openssh (Fedora) via
   https://bugzilla.redhat.com/show_bug.cgi?id=1026430
   Importance: Unknown
       Status: Unknown

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Title:
  openssh-client 6.5 regression bug with certain servers

Status in “openssh” package in Ubuntu:
  Confirmed
Status in “openssh” package in Debian:
  Unknown
Status in “openssh” package in Fedora:
  Unknown

Bug description:
  Previous working versions of SSH (6.2p2) work fine on certain host
  machines as follows:

  penSSH_6.2p2 Ubuntu-6, OpenSSL 1.0.1f 6 Jan 2014
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: /etc/ssh/ssh_config line 19: Applying options for *
  debug1: Connecting to hostname [IPAddress] port 22.
  debug1: Connection established.
  debug1: identity file /home/nelsot08/.ssh/identity type -1
  debug1: identity file /home/nelsot08/.ssh/identity-cert type -1
  debug1: identity file /home/nelsot08/.ssh/id_rsa type 1
  debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
  debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
  debug1: identity file /home/nelsot08/.ssh/id_rsa-cert type -1
  debug1: identity file /home/nelsot08/.ssh/id_dsa type -1
  debug1: identity file /home/nelsot08/.ssh/id_dsa-cert type -1
  debug1: identity file /home/nelsot08/.ssh/id_ecdsa type -1
  debug1: identity file /home/nelsot08/.ssh/id_ecdsa-cert type -1
  debug1: Remote protocol version 2.0, remote software version Cisco-1.25
  debug1: no match: Cisco-1.25
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_6.2p2 Ubuntu-6
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: server->client aes128-cbc hmac-md5 none
  debug1: kex: client->server aes128-cbc hmac-md5 none
  debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
  debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
  debug1: Server host key: RSA 24:75:76:a1:80:0e:6c:4e:a8:c4:a6:a9:d3:34:98:18
  Warning: Permanently added 'hostname,IPAddress' (RSA) to the list of known hosts.
  debug1: ssh_rsa_verify: signature correct
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug1: SSH2_MSG_NEWKEYS received
  debug1: Roaming not allowed by server
  debug1: SSH2_MSG_SERVICE_REQUEST sent
  debug1: SSH2_MSG_SERVICE_ACCEPT received

  
  But in 6.5p1 the following bug occurs:

  OpenSSH_6.5, OpenSSL 1.0.1f 6 Jan 2014
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: /etc/ssh/ssh_config line 19: Applying options for *
  debug1: Connecting to hostname [IPAddress] port 22.
  debug1: Connection established.
  debug1: identity file /home/nelsot08/.ssh/identity type -1
  debug1: identity file /home/nelsot08/.ssh/identity-cert type -1
  debug1: identity file /home/nelsot08/.ssh/id_rsa type 1
  debug1: identity file /home/nelsot08/.ssh/id_rsa-cert type -1
  debug1: identity file /home/nelsot08/.ssh/id_dsa type -1
  debug1: identity file /home/nelsot08/.ssh/id_dsa-cert type -1
  debug1: identity file /home/nelsot08/.ssh/id_ecdsa type -1
  debug1: identity file /home/nelsot08/.ssh/id_ecdsa-cert type -1
  debug1: identity file /home/nelsot08/.ssh/id_ed25519 type -1
  debug1: identity file /home/nelsot08/.ssh/id_ed25519-cert type -1
  debug1: Remote protocol version 2.0, remote software version Cisco-1.25
  debug1: no match: Cisco-1.25
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_6.5p1 Ubuntu-4
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: server->client aes128-cbc hmac-md5 none
  debug1: kex: client->server aes128-cbc hmac-md5 none
  debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<3072<8192) sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
  Connection closed by IPAddress

  
  This is a regression and there are multiple references to this bug occurring previously:

  http://www.held.org.il/blog/2011/05/the-myterious-case-of-broken-ssh-
  client-connection-reset-by-peer/

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