[Bug 1792231] Re: openssh-client: 'DISPLAY "(null)" invalid; disabling X11 forwarding'

[Bryce Harrington]

14.04 has transitioned off Standard Support to Extended Security
Maintenance (https://ubuntu.com/blog/ubuntu-14-04-trusty-tahr) as of
April 2019.  Under ESM the focus for changes is more on security
vulnerabilities in non-desktop packages.  Since this issue sounds to be
more on the cosmetic side, I don't think this fits in the ESM update
policies.  But, I'll attach the patch for future reference.


** Patch added: "avoid_ugly_display_null_invalid_with_x11.patch"
   https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1792231/+attachment/5482868/+files/avoid_ugly_display_null_invalid_with_x11.patch

** Changed in: openssh (Ubuntu Trusty)
       Status: Triaged => Won't Fix

** Tags removed: server-next

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https://bugs.launchpad.net/bugs/1792231

Title:
  openssh-client: 'DISPLAY "(null)" invalid; disabling X11 forwarding'

Status in openssh package in Ubuntu:
  Fix Released
Status in openssh source package in Trusty:
  Won't Fix
Status in openssh package in Debian:
  Fix Released

Bug description:
   affects ubuntu/openssh

  Hi,

  This bug is present in openssh in ubuntu trusty, I haven't tested other
  releases. When X11 forwarding is enabled (via ssh_config, or via -X),
  but no DISPLAY is available, ssh client produces this warning:

  DISPLAY "(null)" invalid; disabling X11 forwarding

  
  root at ubuntu-trusty:/# unset DISPLAY ; ssh -X ubuntu at localhost 'dpkg -l openssh-client | grep ii'
  ubuntu at localhost's password: 
  DISPLAY "(null)" invalid; disabling X11 forwarding
  ii  openssh-client                  1:6.6p1-2ubuntu2.10                        amd64        secure shell (SSH) client, for secure access to remote machines

  The bug was introduced by the changes to fix CVE-2016-1908.
  This upstream change fixes it:

  https://anongit.mindrot.org/openssh.git/commit/?id=5658ef2501e785fbbdf5de2dc33b1ff7a4dca73a

  See https://bugs.debian.org/908652

  Cheers,

   -- S

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