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Date: Tue, 02 Jul 2013 14:52:48 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Michael Samuel <mik@...net.net>
Subject: Re: CVE Request: Ansible not caching SSH host keys

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On 06/30/2013 10:45 PM, Michael Samuel wrote:
> http://www.ansibleworks.com/
> 
> Problem: Default configuration does not cache SSH host keys,
> effectively disabling host key checking
> 
> Note - do not credit me for finding this, I'm just the only person 
> indignant enough to request a CVE
> 
> A colleague found this bug, only to notice that it was logged by
> somebody else (antong on github), and rejected: 
> https://github.com/ansible/ansible/issues/857
> 
> This can be fixed by calling ssh.load_system_host_keys() after line
> 78 of 
> https://github.com/ansible/ansible/blob/496f06c3c90cfd89802622c640480328436746c6/lib/ansible/runner/connection_plugins/paramiko_ssh.py
>
>  While it is possible to call the SSH command instead of using
> paramiko, this isn't the default and the ramifications of not
> checking host keys aren't advertised to users.  A more reasonable
> approach would be to document how to un-cache a host key should it
> change.
> 
> Regards, Michael

Please use CVE-2013-2233 for this issue. After some thought I think it
qualifies, host key caching is def. a security feature designed to
prevent mitm (if you constantly hammer the user to check/accept keys
at some point they'll just go "sure whatever, they must have changed
something on the remote end).

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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