The only place where Drupal deploys FTP is in the updates system. Given that this system requires that you have the permissions to use it I think it is safe to say that Drupal was not compromised to provide access to FTP.  

FTP is not a secure protocol and should be avoided.

If the only file that was changed out what a new index.php than this does not sound like any type of Drupal attack either.  

I think it is safe to say that Drupal was not the cause of this unless you have something specific in your logs that shows otherwise. 

Hope this helps you.

-Steve

On Thu, Oct 25, 2012 at 8:06 PM, <lamp@afan.net> wrote:
Hi,
My development website (Drupal 7.15) setup 2 weeks ago. Only View and
Chaos Tools Suite Modules installed.
I contacted hosting company and they said it's compromised through FTP
-what I don't believe (if it's truth I'm really screwed because there is
tons of other sites too :( )
I got "Security update" message but, since it's development website, I
wasn't rushin'

What's chances it's really FTP or something else? No other problems but
"new" index page. Though, they could "planted" something?

Suggestions?

Thanks for any help,
LAMP

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Steve Kessler
Owner and Lead Consultant 
Denver DataMan, LLC 
303-587-4428