full-disclosure - Re: Modifying SSH to Capture Login Credentials from Attackers

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Date: Tue, 29 Sep 2009 14:58:13 -0700
From: "my.hndl" <my.hndl@...il.com>
To: Kurth Bemis <kurth.bemis@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Modifying SSH to Capture Login Credentials
	from Attackers

The standard logs don't record attempted passwords.  On my post I explained
how this could very easily lead to privilege escalation:

"For obvious reasons, openssh and others never log incorrect passwords (a
mistype of your password would get *winblowz* logged when you meant *
winblows*…such logging would make it trivial to escalate privilege)."

All standard users have read access to /var/log/auth, so if root mistyped
their password, they could easily escalate by guessing what root meant.


On Tue, Sep 29, 2009 at 12:58 PM, Kurth Bemis <kurth.bemis@...il.com> wrote:

> Aren't all auth failures stored in /var/log/auth (or something similar)?
> and won't most log-watching and reporting packages report failed login
> attempts already?
>
> ~k
> On Tue, 2009-09-29 at 12:25 -0700, my.hndl wrote:
> > If you've ever had your SSH server dictionary attacked and wondered
> > what usernames / passwords the attackers were trying...
> >
> > I've posted detailed instructions on modifying openssh on Ubuntu 9.04
> > in order to log username / password attempts made by bots.  This
> > information can then be used to track down the tools / dictionaries
> > being used against you, and may even lead to discovery of IRC command
> > & control channels used by the botnet herders/masters (the topic of my
> > next post).
> >
> > Full username / password logs included for your enjoyment:
> >
> http://paulmakowski.wordpress.com/2009/09/28/hacking-sshd-for-a-pass_file/
> >
> > Intended for novices interested in honeypots.
> > _______________________________________________
> > Full-Disclosure - We believe in it.
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