[Bug 1025418] Re: Using ProxyCommand w/a non-existant host results in infinite spawns.

[Olivier Contant]

Robie, any request for fix take priority based on the level of
disruption.  If more than one person face the issue and require a fix,
it will create momentum and incentive to fix it.

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https://bugs.launchpad.net/bugs/1025418

Title:
  Using ProxyCommand w/a non-existant host results in infinite spawns.

Status in openssh package in Ubuntu:
  Invalid

Bug description:
  Version: OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012
  Package: openssh-client

  Today we discovered a possible bug in the OpenSSH-Client package
  (openssh) that happens when you enable ProxyCommand with a non-
  existant hostname.  This bug is easily replicated with the default
  example in /etc/ssh/ssh_config.  If one uncomments that line and then
  for example tries to push via Git SSH you end up with SSH spawning
  over and over and over again as seein the attached screenshot.

  I have flagged this as a security bug (but ultimately it's up to ya'll
  if it is) because any user can do this and take down any server quite
  easily by adding add a bad ProxyCommand to their ~/.ssh/config.  I was
  able to take out one of my personal servers (which happens to be a
  pretty big server) within a few minutes.

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