[Bug 1025418] Re: Using ProxyCommand with a non-existant URL results in infinite spawns.

[Jordon Bedwell]

** Attachment added: "Screenshot from 2012-07-16 13:34:04.png"
   https://bugs.launchpad.net/bugs/1025418/+attachment/3225301/+files/Screenshot%20from%202012-07-16%2013%3A34%3A04.png

** Visibility changed to: Public

** This bug is no longer flagged as a security vulnerability

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

Status in “openssh” package in Ubuntu:
  New

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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